Search

Legionella are common in the aquatic environment and are responsible for legionellosis including severe pneumonia and Pontiac fever. The culture method has some limitations in quickly detecting viable Legionella. Therefore, we optimized real-time PCR (qPCR) combined with propidium monoazide (PMA) to quantify viable Legionella in the supply process of tap water, considering factors such as PMA concentration, length of the target gene, and turbidity of water samples. Among 30, 50, 100, and 200 μM PMA concentration, 100 μM PMA had the greatest difference in copy number between PMA-treated live and dead cells while minimizing the cytotoxic effect on live cells. Among the various sizes of the target gene (108, 386, 456, and 654 bp), the primer in 386 bp size effectively excluded dead cells without loss of qPCR efficiency. As a result of applying the PMA-qPCR method to samples including river, purified water, and tap water, live and dead cells could be distinguished for samples with turbidity of less than 10 NTU. The optimized PMA-qPCR can be a useful method of rapidly detecting viable Legionella spp. in the process of supplying tap water, and contributing to tap water that is safe from pathogens. HIGHLIGHTS The PMA-qPCR method was optimized to monitor rapidly viable Legionella in the supply process of tap water.; The PMA concentration and target gene size were major factors to exclude dead cells without affecting live cells.; The PMA-qPCR was efficient in water samples with turbidity of less than 10 NTU.;

Abstract Microplastics (MPs) are emerging contaminants of concern in aquatic ecosystems. Up to now, only a few studies about MP contamination in drinking water have been published. In this study, we analysed drinking water originating from ground water, surface water and treated sewage water for the presence of MPs, collected in different drinking water treatment plants (DWTP, n = 9) and water taps (TW, n = 9) in the geographic region of Flanders (Belgium). We report measured microplastic concentrations, size distributions, and polymer types using μFTIR spectroscopy in the range of 25–1000 μm. The MPs’ abundances in the DWTP and TW samples were on average 0.02 ± 0.03 MPs L− 1 and 0.01 ± 0.02 MPs L− 1, respectively. We did not find significant differences comparing the obtained MP concentrations according to the origin of the water. Polypropylene (PP) and polyethylene terephthalate (PET) were the most common polymer types detected in the samples. Next, based on several theoretical assumptions, we extrapolated the measured MP concentrations in our samples to cover the full theoretical MP size range (1–5000 μm) to obtain estimates of the actual MP contamination levels. The rescaled particle concentrations (1 μm – 5000 mm) were on average 5.59 MPs L− 1 and 3.76 MPs L− 1 for the DWTP and TW samples, respectively. Based on a standard consumption of two liters of drinking water per day in combination with the measured concentration in this study, Flemish people consume 0.02 MPs per capita per day via drinking water. These findings contribute in our understanding of the microplastic pollution of drinking water, which is of concern due to the potential uptake of MPs in the human body.

Nitrate is a common contaminant of drinking water. Due to its adverse health effects, this study aimed to determine nitrate levels in six southern districts of Tehran. A total of 148 samples were taken from tap waters. In 84.46% (n = 125) of the samples, the nitrate concentration was below national and WHO limits (50 mg/L); however, 15.54% (n = 23) were in violation of the criteria. The total mean concentration of nitrate was 36.15 mg/L (±14.74) ranging from 4.52 to 80.83 mg/L. The overall hazard quotient (HQ) for age groups were ordered as Children (1.71) > Infants (1.24) > Teenagers (1.2) > Adults (0.96). In all districts, the HQ values for infants and children groups were greater than 1, indicating potential adverse health risks. In teenagers age group, only the HQ estimations of districts 10 (HQ = 0.93) and 11 (HQ = 0.74) were lower than 1 and in adults age group, the estimated HQ values for districts were lower than 1 with the exception for district 19 (HQ = 1.19). The sensitivity analysis (SA) showed that nitrate content plays a major role in the value of the assessed risk. HIGHLIGHTS Levels and noncarcinogenic risk of nitrate were assessed in tap water.; The mean concentration of nitrate was 36.15 mg/L.; Analysis showed that nitrate concentration in 84.46% of the samples was below the standard level limit.; The highest noncarcinogenic risk was in the children group.; The 95th percentile of the simulated nitrate HQ in children was 2.14.;

The physical, chemical and microbial quality of bottled water, tap water and water supplied from wells in the city of Shahroud was compared. The results of the analysis showed that the measured parameters, except in minor cases, were of national and international standards. There was no significant difference between the quality of bottled water and tap water, as well as bottled water and water available in water supply resources in the city of Shahroud. Regardless of the area in which the study was conducted, it was found that there was no need for developing other types of water treatment systems such as bottled water and domestic water treatment systems. In many cases, since bottled water is exposed to intense sunlight during the transport process, there could be a leakage of plastic monomers from the bottle wall into the water in hot or cold conditions, which can endanger consumer health. Tap water supplied from the water supply resources in the city of Shahroud was found to be completely safe and posed no threat to consumer health. HIGHLIGHTS The quality of three water groups in the city of Shahroud was compared.; Tap water supplied from the water supply resources in the city of Shahroud was found to be completely safe and posed no threat to consumer health.; There was no need for developing other types of water treatment systems such as bottled water and domestic water treatment systems for Shahroud water supply.;

Citrate-capped gold nanoparticle (GNP) was used as a ligand for chromium chelating, and chromium ions reaction led to GNP aggregation. The color change of GNP by aggregation in the presence of chromium is a simple and rapid colorimetric test for these ions in an aqueous solution. GNP capped citrate was prepared by the citrate method and characterized by TEM, and its particle size was 20 nm. Also, the surface plasmon resonance (SPR) peak was 520 nm. In the presence of chromium ions, the color of GNP at 520 nm was shifted to 650 nm because of aggregation to give a signal as a ratio of A650/520 more than one and proportional with chromium concentration directly. The optimum conditions were studied to obtain the high signal represented by the volume of GNP, reaction kinetic of A650 with time, selectivity, and interferences of Zn(II), Fe(III), Fe(II), Sn(II), Ni(II), Ca(II), Al(III), Sr(II), Cu(II), Mn(II), Co(II), Mg(II), Ag(I), and Pb(II) ions. The calibration curve is linear in the range of 100–500 ppb, and the regression was 0.9951 and applied on tap water chromium ions in the same range in the regression of 0.95. This method was simple, rapid reaction, consumed low volumes of sample, and had low detection limits. It can be recommended as a new method for chromium (III) detection in aqueous solutions.

According to the world Summit of sustainable Development, the major reason for lack of safe water is either scarcity of water or contamination of water sources. Therefore this study eye on developing nations, seeks to find sustainable, yet economically and socially practical solution to the problems associated with polluted water. To fulfil the objectives of the present study, two medicinal value plants Dhav (Anogeissuslatifolia wall.) and Aragvadha (Cassia fistula Linn.) were selected and absorbents were prepared from the bark of both the plants. Then the reactors were prepared using the different compositions of sand, gravel, absorbents of Dhavand Aragvadha and cotton.In this way four filter reactors were prepared. The feeding rate of raw water is maintained at 0.5 litre per hour. The results revealed that Dhav plant absorbent was found more effective thanAragvadha. All reactors shows different efficiencies for different parameters suggesting that reactors should be prepared based on need or targeted parameters. Over all reactor 4 shows better efficiency for all the parameters. The main exclusivity of the present reactor is low cost with no electricity demand. The prepared reactors are environment friendly and easily implementable but further study is required to prove it on large scale.

IntroductionCatheter-associated urinary tract infection (CAUTI) is a common complication among patients with urinary catheters and is often treated with antibiotics. With increasing rates of antibiotic resistance, it is necessary to explore alternative treatment options for CAUTIs. The aims of this study were 1) to assess the efficacy and treatment satisfaction of bladder irrigation (BI) with tap water to prevent and treat CAUTIs, 2) and to evaluate the current use of BI for CAUTIs among Dutch clinicians.MethodsThe first part of this study consisted of a cross-sectional study among patients with intermittent or indwelling catheters who performed BI with tap water between March 2020 and May 2021. Efficacy, treatment satisfaction, and Patient Global Impression of Improvement (PGI-I) were assessed using questionnaires. Outcomes were compared between neurogenic lower urinary tract dysfunction (NLUTD) and non-NLUTD patients. Factors associated with overall treatment satisfaction were determined using logistic regression analysis. Second, a nationwide survey of Dutch clinicians was conducted to evaluate the current use of BI for CAUTIs.ResultsA total of 99 patients who were performing BI for at least three months were included. The median age was 61.9 years, 41.4% had NLUTD, and 72.2% performed BI >1 year. The majority of both NLUTD (65.9%) and non-NLUTD patients (68.4%) were (very) satisfied with BI. Women had higher odds of reporting higher satisfaction and each additional CAUTI decreased the odds. Most NLUTD (85.4%) and non-NLUTD (65.5%) patients reported an improvement on the PGI-I with a difference in favour of NLUTD patients (p=0.002). In addition, 40.4% of the patients had no CAUTI, and 59.6% reported 1.39 (SD 2.06) CAUTIs. Only half of these self-reported CAUTIs were treated with antibiotics. In addition, 33 (58.9%) clinicians used BI for CAUTIs, of which ten used tap water as irrigation agent.DiscussionThis study provides first evidence supporting the efficacy of BI with tap water in the treatment of CAUTIs and reducing the use of antibiotics. Patients are overall satisfied and experience improvement in their condition with BI. In addition, the majority of the surveyed Dutch clinicians use BI for CAUTIs. However, irrigation with tap water is still not widely used.

Background: Prenatal nitrate exposure from household tap water has been associated with increased risk of fetal growth restriction, preterm birth, birth defects, and childhood cancer. We aim to examine the association between maternal consumption of drinking-water nitrate during pregnancy and small-for-gestational-age (SGA) in a nationwide study of Danish-born children, as only one prior study has examined this association. Methods: We linked individual-level household estimates of nitrate in tap water and birth registry data to all live singleton Danish births during 1991–2015 from Danish-born parents where the mother resided in Denmark throughout the pregnancy. Exposure was both binned into four categories and modeled as an ln-transformed continuous variable. SGA was defined as the bottom 10% of births by birth weight per sex and gestational week. Multiple logistic regression models with generalized estimating equations were used to account for siblings born to the same mother while controlling for relevant confounders. Results: In the cohort of 1,078,892 births, the median pregnancy nitrate exposure was 1.9 mg/L nitrate. Compared to the reference group (≤2 mg/L), we found an increased risk of SGA in the second category (>2–5 mg/L) (OR = 1.04, 95% CI: 1.03–1.06) and third category (>5–25 mg/L) (OR = 1.02, 95% CI: 1.00–1.04) but not in the highest (>25 mg/L). There was strong (p = 0.002) evidence of an increase in SGA with nitrate in the model with continuous exposure (OR = 1.02, 95% CI: 1.01–1.04 per 10-fold increase in nitrate). Results were robust when restricting to households with nitrate levels at or below the current Danish and European Union regulatory drinking water standard (50 mg/L nitrate). Conclusions: Our findings suggest that exposure from nitrate in household tap water, even below current regulatory standards, may increase risk of SGA, raising concerns of whether current allowable nitrate levels in drinking water protect children from SGA.

Drinking bottled water has become both popular and increasingly controversial. as a result of the use of these techniques, some of the necessary elements in water are exposed to remove it such as fluoride. For this reason, the present study aimed to determine the fluoride content in both Tap Water and some types of Bottled water (Commercial) in the Baninah area -Benghazi. Six different types of bottled water from the local market, and three sampling point of tap water (water network supply) were collected for analysis of pH, electrical conductivity (EC), total dissolved solids (TDS), and fluoride for all samples. The results revealed a decrease in total dissolved salts in some types of bottled water compared to the Libyan standard specifications for the quality of drinking water. While the Fluoride content in bottled water and tap water showed fluoride concentrations lower than 1.5 mg/l according to the WHO standards and Libyan standards for drinking water. This requires a medical study to know the other sources that compensate for the lack of fluoride in the water (tap water network supply - bottled water).

This study demonstrates the use of environmental tracers (Water isotopes-δ18O–δ2H, Radon-222Rn, and Electrical Conductivity-EC) as complementary tools for backtracking the water source, estimating pipe water residence time, and monitoring the instability of the water quality. Using the capital of Ethiopia, Addis Ababa, as a case study site, we demonstrate that water isotopes (δ18O andδ2H) effectively backtrack the tap water to its source (springs, reservoirs, shallow aquifers, or deep aquifers). 222Rn is shown to be effective for discriminating groundwater-sourced pipe networks from those that are dominated by surface waters. Our reconnaissance survey reveals that 222Rn, a tracer previously not considered to determine the pipe water residence time, can be used effectively to determine pipe water residence time in groundwater-sourced pipe networks. We recommend further research to explore the capability of 222Rn as a robust indicator of the pipe water residence time in an urban piped water network. The tracers reveal that 50% of the city obtains its water from groundwater and that the groundwater-sourced areas of the city show the highest water quality instability. The water quality in groundwater-sourced pipes varies depending on pumping stoppage owing to power interruptions. Surface water-sourced pipe water shows seasonal variations in water quality, with occasional large deviations from the normal trends following flow interruptions.

A simple solid phase extraction (SPE) coupled with spectrophotometric method was developed for determination of trace permanganate (MnO4−) in water. Commercial reagent polyamined-6 powder was used as SPE stationary phase to retain MnO4− which is based on the fact that MnO4− can be adsorbed on polyamide 6 (PA-6) sorbent as water samples flow through the SPE cartridge. 3,3′,5,5′-tetramethylbenzidine (TMB) were used both as eluent solution and chromogenic agent to convert the adsorbed MnO4− into Mn2+ and generate blue oxidized product with high molar absorptivity. Quantification of MnO4− could be obtained by spectrophotometric detection of the resulting solution flow out of the SPE cartridge. The extraction and detection variables was optimized to maximize the absorbance of the TMB oxidized product. Under optimized conditions, this method provided linear dynamic ranges of 0.01–1 μmol L−1 for MnO4− with preconcentration of 100 mL water sample. The limits of detection (3Sb/m) of this method in deionized water were calculated to be 5.1 nM, and the relative standard deviations were determined to be 3.2% (C = 0.1 μmol L−1, n = 5). This method has been applied to the determination of MnO4− in spiked tap waters and satisfactory recovery was obtained.

Data on the presence of organophosphate esters (OPEs) in drinking water and its significance as a pathway of exposure are limited. In this study, we measure for the first time, concentrations of eight OPEs in 50 UK drinking water samples. Arithmetic mean concentrations of ∑8OPEs were: 6.4 and 11 ng/L in bottled (n = 25) and tap water samples (n = 25), respectively. Concentrations of ∑8OPEs in tap water (mean: 11 ng/L) exceed significantly those in bottled water (mean: 6.4 ng/L) (p ˂ 0.01). Moreover, UK tap water is more contaminated with chlorinated, aryl-, and alkyl-OPEs than bottled water. The predominant OPEs detected were: tris (butoxyethyl) phosphate (TBOEP), tris (2-chloroethyl) phosphate (TCEP), and tris(2-chloroisopropyl) phosphate (TCIPP) with arithmetic mean concentrations in the two water sample types ranging between (3.5–3.8 ng/L), (0.60–3.0 ng/L), and (1.02–2.9 ng/L), respectively. Estimated daily intakes (EDIs) (mean and high-end exposure) via drinking water for different sectors of the UK population were: infants (0.93 and 6.4 ng/kg bw/day) ˃ toddlers (0.46 and 3.1 ng/kg bw/day) ˃ children (0.35 and 2.3 ng/kg bw/day) ˃ adults (0.28 and 2.1 ng/kg bw/day). Based on these data, exposure to Σ8OPEs via drinking water is much lower than via: food, indoor dust ingestion, inhalation, and dermal uptake for adults and toddlers. Reassuringly, our EDIs were lower than relevant reference dose (RfD) values. However, combining our drinking water ingestion data with exposure via other pathways revealed overall exposure to 2-ethylhexyl diphenyl phosphate (EHDPP) and TCIPP to approach health-based limit values for UK toddlers under a high-end exposure scenario.

Water taps can be a reservoir for microorganisms and pose a risk for contamination and infection. In this work, water samples from different common taps were examined to determine the influence of certain parameters on the microbial load of drinking water. Methods: Four different types of taps were installed along the same water pipe. Over a period of six months, water samples were taken at specific intervals and analyzed for their colony-forming units (CFU/mL) and for the presence of the water pathogens Pseudomonas aeruginosa and Legionella pneumophilia. Two different flushing configurations were investigated: Setup A: the same flush intervals for all taps once a day to determine differences based on type, size and mode of operation. Experimental setup B: different flush cycles for manual and electronic taps to investigate the effects of water stagnation in the tap and whether electronic taps with automatic flushes improve water quality. Results: No Legionella pneumophilia and Pseudomonas aeruginosa were found during the study period. The size of the tap has a great influence on the number of CFU/mL—a maximum of 330 CFU/mL was found in the smallest tap and 1080 CFU/mL in the largest tap, with a significant difference. Stagnation in the tap leads to a significantly higher number of CFU/mL. The results of this work can be used as a basis for the development of innovative taps. There are many possibilities in terms of materials, tap size and intelligent action algorithms—such as automatic flushing—to maintain the quality of our drinking water in a resource-saving way. [ABSTRACT FROM AUTHOR]

The estimation of post-mortem interval (PMI) is of critical importance in forensic investigations. This requires thorough knowledge of the decomposition process, with decomposition of remains in terrestrial environments extensively investigated, and aquatic environments largely neglected. In terrestrial environments, entomology is well established as a method of PMI estimation, however in an aquatic environment there are no known predictable necrophages, limiting the use of insects. Common to decomposing aquatic remains, algae may serve as a useful alternative to insects for PMI estimation. This pilot study aimed to examine the use of algae for PMI estimation for remains in confined water bodies, and compare this with the practicality of utilizing entomology in aquatic situations. Pigs were either tethered to cement bricks or allowed to float in individual tubs of fresh water for a period of 1000 accumulated degree days (ADD), with algal species seen to bloom on the piglets successively throughout the trials. Insect appearance was inconsistent across replicates throughout decomposition, potentially as a consequence of seasonality. Overall, entomology was proven an unreliable method in aquatic situations. Algal succession may hold promise as a PMI estimation method in confined water bodies, but requires further investigation and evaluation. [ABSTRACT FROM AUTHOR]

In this study, uranium concentrations were evaluated and the annual effective dose was calculated from the consumption of bottled water and tap water used for drinking in Babylon, middle Iraq. Uranium isotopes (238U, 234U, 235U) were determined for all samples collected using the phosphorylation analyzer technique represented device (KPA). Forty-four samples were collected to cover almost all districts and regions of Babylon. Thirty tap water samples were collected from residential neighborhoods, with 14 samples from local brand bottled water. The results show that the uranium concentrations in the tap water samples ranged from 1.66 μg.L-1 to 2.64 μg.L-1, with an average of 2.12 μg.L-1, and the bottled water samples varied from 1.06 μg.L-1 to 1.82 μg.L-1, with an average 1.47 μg.L-1 . This means that the uranium contents in tap and bottled water samples are less than 15 μg.L-1 and 30 μg.L-1, which are safe values of the WHO, and the EPA respectively. The annual effective dose values of 238U, 234U, and 235U for adult consumption of tap water range between 0.67, 0.0.33, 0.74 μSv.y-1 to 1.07, 0.052, 1.18 μSv.y-1 with averages of 0.86, 0.042, 0.95 μSv.y-1, respectively. Their values in bottled water ranged from 0.43, 0.020, 0.47 μSv.y-1 to 0.73, 0.035, 0.81 μSv.y-1, with an average of 0.59, 0.029, 0.65 μSv.y-1, respectively. The value of the annual effective dose of total uranium isotopes in tap water samples ranged between 1.45 μSv.y-1 to 2.30 μSv.y-1 with an average of 0.85 μSv.y-1, whereas in bottled water varied from 0.92 to 1.58 μSv.y-1 with an average of 1.28 μSv.y-1. [ABSTRACT FROM AUTHOR]

Water can contain pathogenic viruses. Many studies on RNA virus sources have shown that water can transmit them. However, there are few reports on pathogenic DNA virus transmission through water, such as adenovirus, which pose a widespread public health risk. Therefore, this study aimed to show waterborne viral transmission by detecting viruses in pooled human whole blood samples, tap water, and natural water from Mueang District, Phayao Province, Thailand, using a metagenomic approach. Viral prevalence in whole blood samples was measured by polymerase chain reaction (PCR) and quantitative PCR (qPCR), and environmental factors that affect viral infection were assessed. Metagenomics results showed that Epstein–Barr virus (EBV) members were among the prominent cancer-associated oncogenic DNA viruses detected in human blood and all water types similar to the EBV reference sequence (NC_007605). There were 59 out of 813 (7.26%) human whole blood samples that were positive for EBV DNA based on PCR and qPCR for the EBNA-1 and EBNA-2 genes. Water- and blood-borne human oncogenic EBV should be a concern in tap water treatment and blood transfusion in patients, respectively. Therefore, the detection of EBV in water suggests that transmission via water is possible and should be investigated further. [ABSTRACT FROM AUTHOR]

Several factors may impact bacterial diversity in drinking water distribution systems (DWDSs) including the origin of the raw water, the water treatment technologies, and the disinfection practices applied. 16S rRNA metabarcoding was used for the in-depth characterization of bacterial communities in the four studied Croatian DWDSs (A, B, C, D) two of which had residual disinfectant (A, B) and two were without (C, D), while only B utilized the conventional water treatment technology. Significantly higher diversity and species richness were evidenced in non-disinfected DWDSs (P <0.05) compared to disinfected DWDSs. The phylum Proteobacteria was the most abundant in all the DWDSs, being proportionately higher in non-disinfected systems (P <0.05). The most abundant genera in DWDS-A Mycobacterium and Sphingomonas both positively correlated, whereas Lactobacillus negatively correlated with the concentration of disinfection by-products (DBPs) as a sum of haloacetic acids (HAAs). Conversely, the genus Ralstonia positively correlated with the individual DBP dichloroacetic acid. These results indicate that genera Sphingomonas, Mycobacterium, Lactobacillus , and Ralstonia could have an effect on promoting the formation of DBPs, in a similar manner to how negatively correlated taxa may influence their degradation. [ABSTRACT FROM AUTHOR]

Regular water quality measurements are essential to the public water supply. Moreover, selective free chlorine (disinfectant) level monitoring without an interfering agent is necessary. The present work aimed to fabricate poly(caffeic acid) (p-CFA) coated on an electrochemically reduced graphene oxide (ERGO) surface for the selective detection of free chlorine. Electron microscopy and various spectroscopic techniques confirmed the p-CFA@ERGO/glassy carbon (GC) electrode. The p-CFA@ERGO/GC coated probe surface coverage was calculated to be 4.75 × 10−11 mol cm−2. The p-CFA@ERGO/GC showed superior catechol/o-quinone oxidation/reduction peaks for electrocatalytic free chlorine determination. The performance of the developed sensor electrode was outstanding, with an extensive range of free chlorine detection (20 μM to 20 mM), high sensitivity (0.0361 µA µM−1), and low detection limit (0.03 µM). The p-CFA@ERGO/GC capability of the realist water samples, such as the tested commercial and tap water, yielded a good range of recovery (from 98.5% to 99.9%). These values align with the standard N,N′-diethyl-p-phenylenediamine reagent method results. [ABSTRACT FROM AUTHOR]

The Au@CdS nanocomposites have been synthesized using a combination of wet chemical and hydrothermal approaches at lower reaction temperatures. The concentrations of CdS precursors and reaction temperature can be essential in influencing photocatalytic water splitting under blue-LED light excitation. The optimized Au@CdS nanocomposites (5 mM CdS precursors and 100 °C) exhibited the highest hydrogen evolution rate of 1.041 mmolh−1 g−1, which is 175.3 times higher than CdS nanoparticles for de-ionized water under blue-LED light excitation. This result is ascribed to separate photogenerated charge carriers and increased light absorption by the Au core. The Au@CdS nanocomposites (1.204 mmolh−1 g−1) revealed significant applications in photocatalytic tap water splitting under blue-LED light excitation, which is 512.3 times higher than CdS nanoparticles. In addition, reusability experiments demonstrate that Au@CdS nanocomposites exhibit excellent stability for the long-term photocatalytic tap water splitting process. Furthermore, this research shows that Au nanoparticles decorated with CdS shells effectively achieve high-efficiency conversion from light to hydrogen energy. [ABSTRACT FROM AUTHOR]

In this work, the electrochemical corrosion behavior of carbon steel grade 80 (with a minimum yield strength of 550 MPa) was studied in a simulated concrete pore solution containing chloride ions at different concentrations. The solution was prepared with tap water and contaminated with chloride at concentrations of (0, 0.5, 1, 1.5, and 2% as weight percent). Three electrode system was used in the electrochemical measurements. All the measurements were done at room temperature of (25 ±1 °C). Open circuit potential, Tafel extrapolation plot, and cyclic potentiodynamic polarization were utilized in this study. The surface morphologies were investigated by using an optical microscope and Scanning Electron Microscope supplied with Energy Dispersive X-Ray (EDX) Analysis. The results showed that the corrosion potential shifted in a noble direction (from -400mV to -350mV) and the corrosion rate of the steel samples increased (from 0.347μm/y to 0.519μm/y) with the addition of 1% NaCl. Then the potential shifted in an active direction of (-392mV) and the corrosion rate was decreased by (12.3%) with the addition of 2% NaCl, due to the reduction of dissolved oxygen with increased chloride concentration, and the effect of the barrier layer that formed. In addition, the cyclic polarization showed metastable pitting corrosion on the steel surface at the addition of 1% NaCl, and loss of the passivation layer at 1.5% NaCl with the formation of stable pitting corrosion. The critical chloride level was 0.5% NaCl addition. The EDX indicates that corrosion occurs at MnS inclusions sites. [ABSTRACT FROM AUTHOR]

Water is recommended as an alternative for sugar-sweetened beverages (SSBs). Low-income, minority groups in the United States continue to exhibit high SSB and low water consumption, and are more likely to exceed 100% fruit juice recommendations. To test the effects of a home-based intervention designed to replace SSBs with tap water and reduce excess juice consumption among parents and their infants/toddlers. Randomized controlled trial. Parents (n = 92) of infants/toddlers who participated in three Early Head Start home-visiting programs that serve predominantly Hispanic, low-income communities during 2019-2021. The 12-week intervention (Water Up!@Home) simultaneously addressed physical barriers to tap water consumption (via a water filter) and sociocultural barriers to replacing SSBs and juice with water (via a curriculum). Comparison group received a water filter only. We hypothesized that the intervention would lead to a reduction of 6 fl oz/d in SSB and juice consumption. Parent-reported self and infant/toddler SSBs, water (filtered, tap, or bottled), and 100% fruit juice consumption. Analysis of covariance to compare changes in consumption between experimental groups was performed. We also conducted t tests to assess changes within groups. Participants in both groups reported significant reductions in SSBs from baseline (parents: intervention [–11.2 fl oz/d; P < 0.01]; comparison [–8.0 fl oz/d; P < 0.01]; children: intervention [–1.50 fl oz/d; P = 0.03]; comparison [–1.56 fl oz/d; P = 0.02]), increased water consumption (parents in both groups [+5.6 fl oz/d]; children: intervention [+3.61 fl oz/d; P = 0.01], comparison [+2.24 fl oz/d; P = 0.05]), mostly from filtered tap water. Differences between groups were not statistically significant. Intervention participants reported significant reductions in 100% fruit juice vs comparison (parents: –3.6 fl oz/d vs –1.0 fl oz/d; P < 0.01; children: –0.73 fl oz/d vs +0.48 fl oz/d; P =.03). The intervention effectively reduced 100% fruit juice consumption. Water security should be examined as a contributor to SSB consumption in this population. [ABSTRACT FROM AUTHOR]

This study describes the determination of trace levels of antimony(III) by UV–Vis spectrophotometer after preconcentration by the deep eutectic solvent/dithizone probe-based liquid–liquid microextraction method. Ditizone was used as a ligand to form the coordinated antimony complex before extraction in the preconcentration process. In the microextraction method developed in the study, deep eutectic solvent was used to dissolve the complexing agent; thus, the complexation was performed at the same time as the extraction of antimony complex by deep eutectic solvent. All variables likely to affect the ligand-antimony(III) complex, extraction efficiency, and spectroscopic measurement were optimized to lower the detection limit. Under the determined optimum conditions, the detection limit for Sb was calculated as 1.6 × 10−3 mg/L. The detection limit obtained with the method is much lower than the value obtained in the Uv–Vis spectrophotometer with the traditional method. In this study, the percent relative standard deviation for the lowest concentration was calculated as 3.12% (n = 8). This value indicates that the analysis performed has high precision. The applicability of the method was determined by performing spiked recovery tests on tap water taken from different regions. Satisfactory recovery results were obtained between 91 and 105% at three different concentrations. [ABSTRACT FROM AUTHOR]

In this work, a dispersive solid-phase extraction method based on Ni(OH)2 nanoflowers (Ni(OH)2-NFs-DSPE) was developed to separate and preconcentrate copper ions from tap water samples for determination by flame atomic absorption spectrometry (FAAS). Ni(OH)2-NFs was synthesized using a homogeneous precipitation technique and used as sorbent for copper preconcentration. X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy were used to characterize the synthesized sorbent. All experimental variables were carefully optimized to achieve a high enhancement factor of 107.5-folds with respect to the detection sensitivity of the conventional FAAS. The proposed method's analytical parameters including LOD, LOQ, and linear range were determined as 1.33 μg/L, 4.42 μg/L, and 3.0–40 μg/L, respectively. To assess the applicability and reliability of the developed method, optimal conditions were applied to tap water samples and satisfactory percent recoveries (94–103%) were obtained for the samples spiked at 20 and 30 μg/L. This validated the accuracy and feasibility of the developed method to real samples. The developed method can be described as a simple, efficient, and rapid analytical approach for the accurate determination of trace copper ions in water samples. [ABSTRACT FROM AUTHOR]

Drinking water quality and its public health effect are ignored in urban slum households of Ethiopia. The aim of this study was to assess physicochemical and microbial quality of drinking water stored in slum households of Hawassa City, Ethiopia. Cross-sectional study was conducted and a total of 120 water samples were collected from 60 households (60 tap, 60 households) to test the quality. Wagtech Potalab + PTW − 1000 was used to test the parameters. Physicochemical parameters—temperature, turbidity, pH and residual free chlorine were measured. Presence of total and faecal coliform bacteria was tested using the Wagtech membrane filtration procedure. Heads of the households were asked about the case of diarrhoeal diseases in any of their family members. Data were statistically analysed and compared with World Health Organization (WHO) standards. Paired t test was used to analyse the mean difference between tap and household water samples. Binary logistic regression was used to investigate any significant association between presence of faecal coliform in the water samples and occurrence of diarrhoeal diseases. Eight (13.3%) tap and 28 (46.7%) household water samples were found positive for total coliform; five (8.3%) tap and 19 (31.7%) household water samples were positive for faecal coliform. Eleven (18.3%) household water samples had faecal coliform 10–100 CFU/100 ml, which falls under high-risk category based on WHO standard. The paired t test (p < 0.05) showed significant mean difference between faecal coliform count of the tap and household water samples. The binary logistic regression analysis implied the odds for occurrence of diarrhoeal disease is 17.33 more in households with positive faecal coliform results (p < 0.05). It is concluded that there was a significant level of faecal contamination of drinking water at the household level. Therefore, it is recommended that continuous health education on drinking water handling should be given to slum households. [ABSTRACT FROM AUTHOR]

Photodegradation is the chemical conversion of large, toxic, and complex molecules into non-toxic, simpler, and lower molecular weight species due to light exposure. Heterogeneous photocatalysis has sufficient potential to degrade toxic organic pollutants present in wastewater. As industries discharge their effluents containing organic pollutants into natural water bodies, which penetrate into the subsurface through connected pores it is necessary to study this process in natural or tap water. Tap water (TW) is mainly obtained from underground wells having inorganic salts in a minute quantity with a conductivity of 500 μS/cm. TW contains inorganic anions, which affect the photocatalytic activity and photocatalysis process. The aim of this review is to evaluate the effect of TW on the photo-degradation of organic pollutants such as dyes, pharmaceutical products, pesticides, etc., with the support of the literature. The TW had a diverse effect on the photodegradation of organic pollutants; either it may enhance or decrease the rate of pollutants' photodegradation. [ABSTRACT FROM AUTHOR]

In recent years, there has been an increasing interest in removal of emerging contaminants in natural waters due to persistence in the aquatic ecosystem. Conventional water treatment processes are generally insufficient for the removal of these contaminants. Depending on this, advanced oxidation processes (AOPs) may be considered as an alternative to this problem. In this study, Fenton process which produces hydroxyl radicals by the reaction between iron salts and hydrogen peroxide was investigated for the removal of some pharmaceutical residues from tap water. The tap water spiked Carbamazepine (CBZ), Caffeine (CAF) and Paracetamol (PRC) with particular concentrations.All initial and final pharmaceutical concentrations were measured separately by LC-MS/MS to calculate percent removal efficiencies accurately. The optimum concentrations are 0.6 mg/L H2O2 − 8 mg/L Fe2+ and 7.5 mg/L H2O2-6 mg/L Fe2+ for CBZ and CAF, respectively. CBZ and CAF removal efficiency have been detected 99.77% and 99.66%. Solutions obtained after CAF removal were re-measured in LC-MS/MS for 1,7 dimethylxanthine. But 1,7 dimethylxanthine (paraxanthine) which was studied as a by-product of CAF could not be determined on measurements. 99.11% removal efficiency was obtained for PAR at 5 mg/L H2O2 and 10 mg/L Fe2+ concentration. Increased H2O2 and Fe2+ concentration affect the yield of Fenton oxidation in all pharmaceutical residues. [ABSTRACT FROM AUTHOR]

The first examples of highly effective Henry reactions between nitroalkanes and aldehydes or trifluoromethyl ketones that proceed under catalyst-free and additive-free conditions, in a recyclable tap water medium, and at room temperature are reported. This process tolerates a broad range of aldehydes and trifluoromethyl ketones to give a series of β-nitro alcohol products in excellent yields. Such products are widely used in the syntheses of pharmaceutical intermediates and natural products. This protocol can be successfully scaled up to a 50-mmol scale without a reduction in yield. Tap water from different locations in China exhibited pH values ranging from 7.5 to 8.1, but the varying pH had no effect on the yield and the processes were successfully reproduced. Finally, the tap water was effectively recovered and reused without any postprocessing, even when the reaction substrates were different. [ABSTRACT FROM AUTHOR]

The association between the mineral content of drinking water and urolithiasis remains elusive. The aim of this study is to investigate whether the mineral composition of tap water correlates with urinary calculus composition. Patients with calculi that underwent biochemical analysis at two urological centres in the North-West of England between November 2015 and December 2020 were included. Calculus composition was reviewed with respect to patient demographics, serum biochemical variables, and water mineral composition data obtained from the local water supply company using patient postcodes. 1711 urinary tract calculi from 1518 patients, living in 87 water supply zones were included. Water sodium concentration was an independent predictor of mixed calcium oxalate/uric acid calculi (OR 1.157, p < 0.001) and a negative independent predictor of calcium oxalate monohydrate (OR 0.896, p = 0.001) and dihydrate (OR 0.742, p = 0.034) calculi. Moreover, the magnesium-to-calcium ratio of tap water was a negative independent predictor of calcium oxalate monohydrate calculi (OR < 0.001, p = < 0.001), while tap water magnesium concentration inversely correlated with the percentage of calcium oxalate within calculi (rs = − 0.054, p = 0.026). Total water hardness did not independently predict calculus type. Many factors are implicated in the formation of urinary calculi. This study is the first to assess calculus composition in relation to tap water mineral content using postcode data on a case-by-case basis. Though total water hardness did not independently predict calculus composition, the interesting findings relating to water sodium and magnesium concentrations are in need of closer scrutiny in larger scale studies. [ABSTRACT FROM AUTHOR]

Copyright of Diyala Journal of Medicine is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Per- and polyfluoroalkyl substances (PFAS) are notoriously persistent pollutants that are found ubiquitously present in aquatic environments. They pose a big threat to aquatic life and human health given the bioaccumulation feature and significant adverse health effects associated. In our previous study, PFAS were found in surface waters from Biscayne Bay and tap waters from the East coast of South Florida, at levels that arouse human health and ecological concerns. Considering that Florida supports millions population as well as treasured, sensitive coastal and wetland ecosystems, we have expanded the PFAS monitoring study on the occurrence, composition, spatial distribution, and potential sources encompassing tap waters from counties on the West coast of South Florida and Central Florida, and surface waters from Tampa Bay, Everglades National Park adjacent canals, Key West, including Biscayne Bay area. A total of 30 PFAS were analyzed based on solid-phase extraction (SPE) followed by liquid chromatography tandem mass spectrometry (LC–MS/MS). PFAS were detected in all tap water (N = 10) and surface water samples (N = 38) with total concentrations up to 169 ng L−1. Higher PFAS concentrations (> 60 ng L−1) are mostly observed from polluted rivers or coastal estuaries in Biscayne Bay, and sites nearby potential points sources (military airbases, wastewater facilities, airports, etc.). Our findings on current PFAS contamination levels from diverse aquatic environments provide additional information for the development of more stringent screening levels that are protective of human health and the environmental resources of Florida, which is ultimately anticipated as scientific understanding of PFAS is rapidly growing. [ABSTRACT FROM AUTHOR]

Although tap water in Bangkok has met international standards, some consumers do not trust that it is safe to drink. The demand for bottled water is still increasing. This may result in infrastructure investments and the production of waste. This study aimed to explore factors that influence the acceptance of drinkable tap water among Bangkok residents. Data for this cross-sectional study were collected via an interview of 374 participants using a structured questionnaire. There was a significant prevalence (51.87%) of the acceptance of drinkable tap water among Bangkok residents. Among them, 82.99% selected tap water to drink and 9.79% drank water directly from the tap. Factors that affected the acceptance of drinkable tap water were occupation, monthly income, campaign perception, personal belief, unacceptable sensory appearance, risk perception, knowledge, and attitude. This study found that drinking water selection was not associated with self-reported diarrhea. While we recognize that the cross-sectional study has some limitations, our data may provide additional insight into factors which affect consumers' behavior and may offer several benefits for water suppliers and public health decision-makers. This would eventually increase public awareness for economic benefits associated with the use of tap water and finally would reduce pollution by plastic waste. HIGHLIGHTS The manuscript presents recent surveillance data for the acceptance of drinking water by end-consumers in relation to water quality and supply.; The results of water quality monitoring are discussed with a view to socio-demographic and sanitary factors.; We present the most obvious conclusions derived from this analysis and their possible implications for water quality maintenance.;

This study aimed to determine the accuracy of various thawing duration and temperatures to the quality of Simmental bull frozen semen. The experimental design used was a randomized group design with five treatments and ten replications, then analyzed using Chi-Square to compare the expected percentage of motility is 40%, and total motile spermatozoa are 10 million/straw value of SNI. A further test is carried out with Duncan's Multiple Range Test (DMRT) if there is a difference. The thawing treatments were 30 seconds at 37ËšC water temperatures (T0) according to SNI and at 15 seconds (T1), 30 seconds (T2), 45 seconds (T3), and 60 seconds (T4) with 28ËšC tap water temperatures. Variables observed involve motility, viability, abnormalities, concentration, and total motile spermatozoa. The data were analyzed using Analysis of Variance (ANOVA) with a significant difference in variance (P0,05). The motility and the total motile spermatozoa reach the highest results at the tap water temperatures T3 (P

The study objective was to identify correlates of tap water consumption among adolescents. French-speaking adolescents from the province of Québec (Canada) were recruited in person and online from March to July 2023 using diverse recruitment strategies. Water consumption was measured using the validated French version of a questionnaire specifically designed to measure adolescents' beverage intake. Participants answered an online survey on their attitude towards tap and bottled water which also measured individual and environmental factors that can influence tap water consumption. A total of 218 adolescents (14–17 years; 55.5% female) completed the survey. On average, 79.2% of adolescents' water intake came from tap and 33.5% of them consumed exclusively tap water. Thinking that bottled water is more convenient than tap water was a significant correlate of adolescents' tap water consumption (OR = 0.70; 95% CI: 0.51, 0.95; p = 0.0219). Adolescents who believed that bottled water is more convenient than tap water were less likely to consume exclusively tap water. Public health interventions aimed at promoting adolescents' tap water should strive to make tap water intake be perceived as convenient as bottled water, such as encouraging teenagers to always carry along a reusable water bottle, installing drinking fountains in popular public areas, and increasing the visibility of such fountains. [Display omitted] [ABSTRACT FROM AUTHOR]

The identification and quantification of antibiotics in different types of water is of growing interest due to the resistance their presence can induce in many bacterial species. Although the electrochemical analysis of electroactive antibiotics via voltammetric techniques is rapid, simple and cost-effective, their simultaneous detection is often challenging due to their overlapping oxidation peaks. To address this issue, we have developed a voltammetric electronic tongue for the discrimination and quantification of antibiotic mixtures in tap water. For that purpose, three different screen-printed carbon electrodes were modified with "green"-synthesized metallic nanoparticles (NPs) of copper and silver, and commercial titanium dioxide NPs. The electrochemical behavior of the electrodes against the detection of six antibiotics was first investigated by cyclic voltammetry, proving the catalytic effect of the selected NPs. Next, principal component analysis and artificial neural networks (ANNs) were used to achieve the accurate discrimination and quantification of three selected antibiotics, cefepime, daptomycin, and vancomycin, at the mg/L level with a normalized root mean square error (NRMSE) of 0.055 for the test subset. Finally, after validation of the ANN model, the analysis of tap water samples spiked with the three selected antibiotics was carried out to test its applicability for water quality monitoring, showing a good agreement with the expected values (average recovery of 95 %, and NRMSE of 0.034). [Display omitted] • A voltammetric sensor array for the analysis of antibiotics in water. • The incorporation of nanoparticles into sensors generated differentiated responses. • Data analysis based on principal component analysis and artificial neural network. • The electronic tongue allowed the quantification of antibiotic mixtures. • Good agreement between expected and found values for the spiked water samples. [ABSTRACT FROM AUTHOR]

[Display omitted] • In-syringe HLLME was developed for the first time in this research. • Cost-effective: Requires only small volumes of organic solvent (μL-level) • One-step analysis process: Simplifies the analytical procedure. • Convenient operation: Short extraction time and straightforward operation. In this study, an analytical method called in-syringe homogeneous liquid–liquid microextraction was developed and applied for the extraction and preconcentration of plasticizers including di ethyl phthalate, di isobutyl phthalate, di- n -butyl phthalate, di(2-ethylhexyl) adipate, and di(2-ethylhexyl) phthalate and one antioxidant, (butylated hydroxytoluene). Only a few microliters of dibutyl amine was used as the extraction solvent. This switchable solvent became miscible in the solution of interest by adding acetic acid at µL-level to extract the analytes. Also, the addition of sodium carbonate (in mg-level) into the solution led to the release of carbon dioxide, which facilitated the extraction of plasticizers into the extractant. Also, sodium carbonate caused to the regeneration of the extractant in the upper narrow bore of the syringe. The enriched analytes were determined by a gas chromatographic equipped with a flame ionization detector. Under the optimum conditions, extraction recoveries and enrichment factors were obtained in the ranges of 39–78 % and 196–394, respectively. Also, the limits of detection and quantification were in the ranges of 1.76–12.51 µg/L and 5.80–41.28 µg/L, respectively, and the r2 values were equal to or better than 0.991. Development of the method as a one-step analysis processed which was electrically independent in extraction and preconcentration stage (no centrifugation or vortexing) and inexpensive. The use of only µL-level of organic solvent, convenient operation, and short extraction time are the other highlights of the method. This method was successfully applied to the extraction, preconcentration, and determination of several plasticizers in eight different city water samples. [ABSTRACT FROM AUTHOR]

The health issues of urban tap water are of great concern in the context of sustainability challenges to the environmental quality of water and the security of the water supply. In this work, tap water from the main urban areas in Wuhan and surface water from the Yangtze River and the Hanjiang River were collected during summer (June) and winter (December), 2022. The concentrations of 10 heavy metals including Fe, Al, Mn, Co, Ni, Cu, Se, Cd, Cr and Pb were determined for water quality evaluation and health risk assessment. The results demonstrated that almost all of the tap water samples contained metal concentrations below the Chinese national standard limits for drinking water (GB 5749-2022). The risk of heavy metals in tap water to human health was evaluated, and the results showed that the total carcinogenic risk (TCR) was in the range of 10−6 and 10−4 and the hazard index (HI) was much lower than one in both summer and winter. The current tap water in Wuhan is generally in a relatively safe state and will not cause acute hazards or chronic diseases in the short term, but the long-term cancer risk is still noteworthy. The heavy metal pollution index (HPI) showed that the overall water quality of urban drinking water sources in Wuhan has been satisfactory, despite its slightly polluted state in winter. Pipeline corrosion was considered as one of the important sources of heavy metals in Wuhan tap water, which can explain, to a certain extent, the increase in the heavy metal concentrations of tap water outlets relative to the finished water reported by waterworks, such as Fe, Ni, Cd and Pb. This study has implications for the formulation of better urban water supply security management strategies and associated sustainability challenges.

This study aimed to assess the impact of tap water application on reducing the generation of ultrafine particles from the wheel-rail contact using a twin-disk rig under dry and wet conditions, with train velocities of 45 and 80 km/h. A small amount of 0.3 L/min tap water was applied at the wheel-rail contact, and a diffusion dryer was used to eliminate water vapor. The Fast Mobility Particle Sizer measured the number concentration (NC) of nano-sized wear particles in the range of 6 to 560 nm. The tap water application method effectively reduced the NC of ultrafine and fine particles by 67–72% and 86–88%, respectively. Positive reduction rates were observed for all diameters at 45 km/h and for most diameters, except for approximately 70 nm and 80 nm, at 80 km/h. Even with a small amount of water, this approach successfully decreased nano-sized wear particle generation. However, the potential influence of mineral crystals in tap water on NC requires further investigation. Overall, this method shows promise for enhancing air quality and public health by mitigating nano-sized wear particle generation in subway systems.

The inner walls of the drinking water distribution system (DWDS) are expected to be clean to ensure a safe quality of drinking water. Complex physical, chemical, and biological processes take place when water comes into contact with the pipe surface. This paper describes the impact of leaching different compounds from the water supply pipes into drinking water and subsequent risks. Among these compounds, there are heavy metals. It is necessary to prevent these metals from getting into the DWDS. Those compounds are susceptible to impacting the quality of the water delivered to the population either by leaching dangerous chemicals into water or by enhancing the development of microorganism growth on the pipe surface. The corrosion process of different pipe materials, scale formation mechanisms, and the impact of bacteria formed in corrosion layers are discussed. Water treatment processes and the pipe materials also affect the water composition. Pipe materials act differently in the flowing and stagnation conditions. Moreover, they age differently (e.g., metal-based pipes are subjected to corrosion while polymer-based pipes have a decreased mechanical resistance) and are susceptible to enhanced bacterial film formation. Water distribution pipes are a dynamic environment, therefore, the models that are used must consider the changes that occur over time. Mathematical modeling of the leaching process is complex and includes the description of corrosion development over time, correlated with a model for the biofilm formation and the disinfectants–corrosion products and disinfectants–biofilm interactions. The models used for these processes range from simple longitudinal dispersion models to Monte Carlo simulations and 3D modeling. This review helps to clarify what are the possible sources of compounds responsible for drinking water quality degradation. Additionally, it gives guidance on the measures that are needed to maintain stable and safe drinking water quality.

Introduction: Health is the main concern for all and it is taking on serious note now a days. The potential deleterious effects of environmental chemical exposure caused serious and high concern threat to the life which indeed has gained considerable interest for research works. Cauliflower (Brassica oleracea var. botrytis L.) is one such vegetable where the maximum spraying of pesticides is in practice. There are undeniable evidences regarding the hazardous effects of the sprayed pesticides. Ayurveda has explained the purification measures for all kinds of articles which are poisoned or mixed with chemical. Objective: The present study was carried out to analyze the effect of washing processing on the reduction of pesticide residues in cauliflower through the gas chromatography–mass spectrophotometry (GC-MS). Residual level of pesticides in cauliflower after washing with tap water and medicated water was analyzed. Methods: Each cauliflower was divided into three samples and different washings were compared with the control sample. Results: The results of the present study showed that using medicated water, we can be able to have less contaminated cauliflower vegetable. It was concluded from this study that traditional processing methods play a significant role in the reduction of pesticides such as prefenofos and indoxicarb which are really harmful when taken fortunately and frequently with food. Conclusion: Medicated water sample was appreciated to been efficient method of washing is evidenced by the GC-MS. Hence, an attempt was made at such level to create the awareness about the same and follow traditional methods for washing vegetables.

Do different degrees of cleanliness preference affect consumers' choice of daily drinking water at home? The purpose of the present paper is to test the validity of various hypotheses related to this question by analyzing the results of an online survey conducted in the Tokyo area. Cleanliness has an aspect of personal norm for normalcy of things. Preference of cleanliness can be divided into the following two types. One is orderly cleanliness and the other is aversive cleanliness. Orderly cleanliness is oriented toward the control of impure things, while aversive cleanliness is oriented toward retention of immaculacy. We demonstrate that each of these cleanliness preference is involved in the choice of drinking water in its own way. Our survey results suggest that orderly cleanliness encourages the choice of tap water filtered through water purifier, while aversive cleanliness urges the choice of bottled water. HIGHLIGHTS Orderly cleanliness urges the choice of tap water filtered through a water purifier.; Orderly cleanliness urges the choice of bottled water.; Aversive cleanliness inhibits the choice of untreated tap water.; Aversive cleanliness urges the choice of bottled water.;

Public water supply services in Yangon started in 1842, however the practice of drinking tap water has been uncommon until this moment. Currently, Yangon city development committee is upgrading the tap water system in accordance with the greater Yangon water supply improvement project. It is important to know the perceptual driving factors affecting the decision to drink in order to effectively improve the public acceptance of tap water. In this study, household water management practices and their influencing factors for Yangon city residents are revealed through questionnaires. Residence time in Yangon city is significantly associated with water consumption behaviour. Decisions for drinking come from organoleptic perception rather than important safety considerations. The future consumption of tap water is influenced by income and perception of overall quality. Preferred billing method is associated with education, family size, income and willingness to spend more for better quality water. HIGHLIGHTS Study conducted in a developing country with 178-year-old public tap water system.; Decision for consumption based on organoleptic perception rather than safety parameters.; Familiarity is important, regardless of quality.; Income and perception play important roles for future consumption.;

Radon is readily soluble in water, and radon exposure caused by household water consumption may pose a threat to public health. In this study, the radon concentration in the tap water of residential buildings was measured, and the average value was 543.33 mBq L−1, which was in line with the radon concentration limit recommended by USEPA (11.11 Bq L−1) and EURATOM (100 Bq L−1), and also within the range of the results of radon concentration measurements in tap water in other countries or regions. Through water bath heating at different temperatures, the radon retention curves of multiple groups of samples at different temperatures were fitted and analyzed. The results showed that the radon retention continued to decrease between 25 and 70 °C, remained stable between 70 and 85 °C, and then continued to decline slowly. Combined with the measurement results, the effective doses of α- and β-particles emitted by 222Rn and its progenies to residents respiratory and alimentary tissues and organs were calculated using the computational model provided by ICRP under two typical water scenarios of shower and drinking water, and the results show that radon exposure caused by normal water consumption will not pose a serious threat to public health. HIGHLIGHTS The radon concentration of domestic tap water in Urumqi, Xinjiang was measured.; The variation trend of radon concentration in tap water with temperature was analyzed.; The radiation dose contributed by radon exposure to residents under different water-use scenarios was calculated based on the actual water temperature.; The radiation doses to human organs from the α and β decay progenies of radon were calculated.;

United States Environmental Protection Agency (USEPA) drinking water violation report is currently one of the most reliable measures of evaluating United States drinking water quality. While states continuously strive to comply with federal water quality standards making this documentation continuously relevant, consumers are likely to perceive water quality through sensory aesthetics or physical and virtual social networks. This research quantifies the relationship between consumer perceptions and government-reported drinking water quality to provide insights to state water managers and policymakers. We evaluated consumer perceptions of tap water using weekly social media data. The online search returned 898,709 mentions and 799,035 posts. Net sentiment, measured as the number of negative posts minus the number of positive posts divided by the number of posts expressing sentiment, was determined and ranged from −100 to 100. Net sentiment was uncorrelated with USEPA weekly water quality violations for most states. Net sentiment was correlated with violations related to arsenic standards (−0.223) and a total number of violations (−0.220) for Washington. For California, net sentiment was correlated with violations related to disinfectants and other organic compounds (−0.295). In many cases, water violations in one city became national news, which eclipsed local water issues circulating on social media. HIGHLIGHTS Estimated state sentiment scores on tap water perception in the U.S.; Compiled government agency data on water quality violation report.; Found no correlation between sentiment scores and government agency data for most states.; Increasing consumer engagement and awareness of violation report data is needed.;

Tap water that is safe to consume may cause respiratory illness (e.g., Legionnaires’ disease) when water conditions allow for proliferation and aerosolization of biofilm-associated pathogens. This study assessed household tap water consumption, exposure to aerosolized tap water, and associated demographics. A nationally representative FallStyles survey administered by Porter Novelli Public Services was sent to 4,677 US adult panelists in October 2019. There were 3,624 adults who completed the survey (77.5% response rate). Respondents were asked about self-reported use of household tap water for consumption (i.e., drinking, rinsing produce, or making ice) and use through water-aerosolizing devices (e.g., showerheads, humidifiers). Demographics included gender, age, race/ethnicity, education, income, region, and health status. Weighted analyses using complex sample survey procedures were used to assess tap water exposure by route and demographics. Most US adults are exposed to aerosolized tap water through showering (80.6%), and one in five are exposed through other water-aerosolizing devices (20.3%). Consumption and showering were greatest among older, White, higher educated, and higher-income adults. Aerosolized tap water can transmit waterborne pathogens and cause respiratory illness, especially among older age groups and people with weakened immune systems. These results will help target health messages for using water-aerosolizing devices safely. HIGHLIGHTS Most individuals report using tap water through a showerhead at home, and one in five report using in aerosolizing devices, such as vaporizers and humidifiers.; Demographic differences were found among groups that reported using tap water for aerosolizing devices.; Public health efforts are needed to promote good water management practices when using household devices that aerosolize tap water.;