Search

This paper refers to a survey conducted in Zhengzhou section of the Yellow River for the purpose of investigating heavy metal pollution characteristics and of exploring the pollution sources. Monitoring was thereby carried on August 29-31, 2022 along the riparian zone collecting samples of the river sediments and analyzing the concentrations of nine kinds of heavy metal, including Cd, Pb, Cu, Zn, As, Hg, Cr, Ni and Mn. Then the Tessier five-step sequential extraction method was used for the morphological analysis of the heavy metals; the ground accumulation index (Igeo) was used to evaluate heavy-metal pollution degree, with Nemero pollution index being applied to the comprehensive assessment of the pollution situation; and the principal component analysis (PCA) and absolute factor analysis-multiple linear regression analysis model (APCS-MLR) were used to analyze the source of the pollutants. Consequently, the survey showed that both of the mean concentrations of Pb and Cd in the sediments of the riverine zone of Zhengzhou section of the Yellow River exceeded the soil background value of heavy-metal in Henan Province. Results of the speciation analysis showed that the environmental activities of Mn, Cd, Pb and Hg were relatively high; the evaluation of geo-accumulation index (Igeo) indicated that Cd had resulted in slight to moderate pollution in the sediments of the River; and the evaluation results of the Nemero pollution index showed that all the above-mentioned heavy-metal elements were on the safety level. Result of the source apportionment suggested that tannery industry, agricultural activities and automobile parts production, as well as the natural source were the major heavy-metal pollution sources in the riparian zone of Zhengzhou section of the Yellow River. [ABSTRACT FROM AUTHOR]

The increasing emissions of industrial production and transportation have resulted in serious atmospheric heavy-metal pollution, posing threats to the health of urban residents. In this paper, the bryophyte is recommended to monitor the pollution, which features wide distribution, low cost, and being able to get intuitive results. Thus, a kind of moss (Sphagnum palustre) bag was applied to monitoring the concentrations of atmospheric heavy metal (incl. Cd, Cr, Cu, Pb and Zn) in Guangzhou City, and accordingly the pollution degree and health risks were evaluated. The results obtained from the monitoring showed that in comparison with the pre-exposure to the atmospheric heavy metal pollution, the post-exposure geometric mean values of concentrations of Cd, Cu, Pb and Zn contained in the mosses were 1.2, 2.3, 1.4 and 2.3 times higher than, respectively, however Cr concentration decreased slightly (0.9 times); and in general, the geometric mean values of concentrations of Cd, Cu, Pb and Zn were comparatively high in industrial areas, while in commercial areas, the concentrations of Cu, Pb and Zn were found to be higher than the scenic and residential areas. Principal component analysis (PCA) and cluster analysis (CA) revealed that industrial activities and traffic emission were the main sources of atmospheric heavy metal contamination of Guangzhou City. Following the heavy metal pollution status-quo investigation with moss, four functional areas were assessed using the contamination factor, which indicated that in the monitoring sites showing heavy metals (Cu, Pb, Zn) pollution was high/very-high, the emissions mainly came from coal combustion, industrial metal production and processing activities, while those showing moderate (Cu, Zn) pollution, the pollutants came from traffic sources, and the monitoring sites where heavy metal contamination level was low, were utterly distant from industrial emission sources and traffic pollution sources. In conclusion, the moss bag (Sphagnum palustre) is rather adaptive to monitoring atmospheric heavy metal contamination in urban areas. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology 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.)

For better understanding of the research status, trends and hotspots on cropland soil pollution in China, this paper retrieved literatures based on CNKI Chinese database from 1991 to 2021, and summarized the research status quo of cropland soil pollution in China by using the visualization tool CiteSpace and Excel. The results showed that: (1) the research on cropland soil pollution was divided into three stages, i.e., initial development stage (1991-2001), progressive development stage (2002-2013) and mature development period (2014-2021). The cropland soil pollution is currently in a rapid development period in China. Although the total number of publications are increasing year by year, the proportion of core publications fluctuates between 30% and 40% and shows a declining trend. (2) Some research teams led by Luo Yongming, Teng Ying, Wu Longhua, etc. in this field had lower relationship and cooperation together. (3) Heavy metal pollution in soil was one of the main aspects of cropland soil pollution research in China. (4) The frontiers in this field focused on the source apportionment, cadmium pollution, ecological risk and passivation. (5) The research of cropland soil pollution in China have an obvious regional differences. The number of studies on cropland soil pollution in the south China was more than that in the north China, and most of them focused on the major grain-producing areas such as Yangtze River Delta and Pearl River Delta. [ABSTRACT FROM AUTHOR]

Objective Soil contamination by heavy metals is a pervasive issue, and this paper investigates the spatial distribution of Pb, As, and Cd in the groundwater-soil-rice system in the Changshou district of Chongqing. We also assess their exposure risk and predict their potential changes in the future. Method Geostatistical techniques, ArcGIS, and the target hazard quotients (THQ) methods were used to assess the risk of the three metals entering food chain. Based on these results, we predicted their potential changes and distribution up to 2036. Result Pb, As, and Cd in groundwater, soil and rice co-existed spatially, with their concentrations higher in the southwest than in the northeast. The THQ model did not showed risk of rice consumption for adults (THQ (As, Pb, and Cd) <1), but showed that there was slight risk of Cd (THQCd=1.12) and Pb (THQPb=1.05) for children. The model predicted substantial differences in the content of Pb, As, and Cd between different three management scenarios: ideal, no human intervention, and severe pollution until 2036. While the contents of the heavy metals were predicted to decrease by 4% to 8% under the ideal scenario in 2036 compared to the current level in 2021, allowing severe pollution to continuously happen is expected to increase heavy metal content by 1.51 to 1.72 times the current level.Conclusion Industries are the primary source of heavy metal pollution in Changshou district. Regarding the exposure risk to children and vulnerable people, and current pollution level, strict measures, including controlling discharge of industrial waste into soils and remediating contaminated soils are essential to reducing heavy metal contents in soil and alleviating them entering food chain. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office 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.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board 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.)

Acid mine drainage (AMD) is an environmental problem commonly found in mining area. This paper collectively investigated the physicochemical parameters in AMD, and the speciation of heavy metals in the sediment and the associated risk of their re-mobilization in the Shirenzhang mine site. Results indicated that the aquatic systems suffered a combined pollution of heavy metals As, Zn, Cu, and Fe. The secondary Fe minerals in the sediments were capable of immobilizing the heavy metals and the immobilization affinity of minerals to As was stronger than that to Zn, Cu, and Cd. At pH<3, the well crystalline minerals including jarosite and ferroarsenite were detected in the sediments, and the heavy metals were mainly presented in the crystalline iron oxide-bound phase and the residual phase. The stability of heavy metals was relative high. At pH>3, however the poor crystalline iron oxyhydroxide including schwertmannite and β - Fe(OOH) were the dominant secondary minerals. And the heavy metals in the sediments were mainly presented in the surface-adsorbed phase and the poor crystalline iron oxide-bound phase, which led to a low stability of the heavy metals. In addition, the relative abundance of iron reducing bacteria was high in the sediments at pH>3, which might induce the transformation of the secondary minerals and the associated mobilization of heavy metals. These results provided important insights into the geochemical behavior of heavy metals in AMD environments. [ABSTRACT FROM AUTHOR]

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office 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.)

Copyright of World Nuclear Geoscience is the property of World Nuclear Geoscience Editorial Office 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.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology 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.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office 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.)

Copyright of Forest Engineering is the property of Forest Engineering Editorial Office 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.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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.)

Objectives: The pollution of heavy metal has become increasingly serious in recent years. The accumulation of heavy metals in the soil will be a threat to ecological balance and human health. Therefore, we need to obtain heavy metal content in soil quickly and accurately. Methods: This paper proposes a method to combine field and laboratory spectra to construct a mechanism estimation model of soil lead (Pb). Firstly, direct standardization (DS) algorithm was employed to eliminate the influence of environmental factors on the field spectra. Secondly, in order to enhance the diversity of the samples, the laboratory spectra were introduced to joint modeling. Finally, the characteristic spectra of iron oxide were extracted for modeling to increase the model rationality. Results: This method was validated by the spectra of 70 soil samples from Xiong'an farming area in Hebei province. The accuracy R² of model established by full-band field spectra without DS correction was only 0.220 0. However, the accuracy R² of model established by the pro⁃ posed method in this paper reached 0.914 6.Conclusions: It indicates that the model for estimating Pb content can be significantly improved by removing the influence of environmental factors on the field spectra, extracting the iron oxide characteristic spectra of the combining field spectra with laboratory spectra. [ABSTRACT FROM AUTHOR]

Groundwater pollution remediation has always been a hot topic in the field of environment. Nano zero-valent iron material (nZVI) has been widely used in the treatment and remediation of halogenated organics and heavy metals in groundwater. In this paper, we briefly describe nZVI and its modification technologies, expounds the characteristics of nZVI and its modified materials in groundwater remediation, summarizes the influence of groundwater environment on the properties of nZVI materials, and summarizes the in situ remediation cases of groundwater halogenated organic matter and heavy metal pollution of nZVI and its modified materials. Finally, the author looks forward to the development of nZVI and its modified materials in the field of groundwater in situ remediation in the future, and puts forward some suggestions, such as establishing a simulation model to simulate nZVI modification technology and pollutant removal process, and carrying out the research on the environmental effects and fate of nZVI and its modified materials in the process of groundwater pollution remediation, in order to provide theoretical reference for the research of large-scale practical application of nZVI. [ABSTRACT FROM AUTHOR]

Soil heavy metal pollution has become one of the hot environmental issues of global concern, and its treatment and remediation has become a major scientific and technological demand for social and economic development. Soil animal earthworm-plant remediation has become a new way to control soil heavy metal pollution. Based on a large number of documents at home and abroad, this paper expounds the important role of earthworms in phytoremediation of heavy metal contaminated soil from three aspects, including changing soil physical and chemical properties from earthworm activities to accelerate phytoremediation of heavy metals, promoting phytoremediation of heavy metals by earthworm and microbial interaction, change of heavy metal morphology by earthworm secretion and excrement to affect phytoremediation of heavy metals, so as to provide theoretical reference for subsequent related research. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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.)

Copyright of Journal of Laser Biology / Acta Laser Biology Sinica is the property of Acta Laser Biology Sinica Editorial Office 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.)

Copyright of Asian Journals of Ecotoxicology is the property of Gai Kan Bian Wei Hui 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.)

Copyright of Environmental Science & Technology (10036504) is the property of Editorial Board of Environmental Science & Technology 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.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board 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.)

Copyright of Journal of Irrigation & Drainage is the property of Journal of Irrigation & Drainage Editorial Office 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.)

[Objective] The study aimed to identify the characteristics of heavy metal pollution in the dam soil in the loess ruins and gully are- as and conduct ecological health risk assessment. 【Method] In the paper, the loess remnant gully area was selected as the research object in the Xi' aogou check dam in Xiangning county, Shanxi province. 70 soil samples of 0 -20 cm were collected in August, 2021. The content of Cd, Cu, Pb and Zn, Ni, As, Hg, Cr were determined. ArcGIS 10. 4 was used to interpolate the distribution of soil heavy metals in space, and the single factor index (P;), Nemerow comprehensive index (P), and potential ecological risk index (RI) were used to eval- uate the distribution of eight soil heavy metal elements and the risk level. The PMF model was used to analyze the source of heavy metals of the soil. 【Result】 (i) The contents of eight soil heavy metals in the soil surface of the study area did not exceed the soil pollution risk control standards in agricultural land, but the average content values of Cd, Pb, Zn, As, and Hg were higher than the soil background values in Shanxi province, while the mean values of Cd, Pb, Zn, and Hg were higher than the soil background values. Cd, Cu, Pb, As, and Hg were relatively higher near villages and traffic roads when compared with the other sampling point. They showed a band-like distribution with higher content in the north and south and lower in the middle. (ii) The single factor index method showed that Cd and Hg were the most pol- luted when compared with the other heavy metals. The Nemerow comprehensive index method indicated that the Xi'aogou check dam was slightly polluted. (iii) The potential ecological risk index of a single index showed that Cd and Hg belonged to medium risk, while the others were low risk, which indicated that Hg and Cd had the highest ecological risk in Xi'aogou check dam soil. (iv) The PMF model indicated that there were 5 pollution sources in the Xi'aogou dam land soil, namely agricultural sources, livestock and poultry breeding sources, traffic sources, atmospheric deposition sources, and natural sources with the contribution rate of 22.71%, 24. 22%, 19. 10%, 16.63%, and 18.32%, respectively. And agricultural sources and livestock and poultry breeding sources contributed the most. 【Conclusion] Human activ- ities have already affected the content of heavy metals in dam soil to a certain extent. More attentions should be paid to the potential soil heavy metal pollution caused by Cd and Hg in the future. [ABSTRACT FROM AUTHOR]

[Objective] The paper provides references for the prevention of heavy metal pollution and the protection of cultivated soil environ- ment through exploring the content characteristics and the risk of heavy metals elements of paddy soil in Chongqing. 【Method】230 paddy soil samples were collected from 7 major and typical rice-growing regions in Chongqing, and the pH and the content of 5 heavy metal elements in- cluding Cd, Hg, As, Pb and Cr in paddy soil samples were analyzed. The Nemero pollution index evaluation method and the land accumula- tion index evaluation method were used to analyze the degree of pollution, and compared with the background value of heavy metals in Chongqing soil and the risk screening value of agricultural land soil. The characteristics of heavy metal pollution in Chongqing paddy soil were analyzed and evaluated. Then, the possible sources of heavy metal pollution in soil were explored through Pearson correlation analysis and cluster analysis. 【Result】 The average contents of Pb, Cd, Cr, As and Hg in the paddy soil of the research area were 25.4, 0.312, 66. 8, 4.71 and 0.0827 mg/kg, respectively. Through the analysis of single factor pollution index and Nemero pollution index evaluation methods, 19.57% of the paddy soil sites in the study area were in the state of Cd light pollution, 0.43% was in the state of Hg medium pol- lution, and the remaining points were in the state of no pollution. According to Geo-accumulation index, the paddy soil was lightly polluted by Cd, while the remaining heavy metal elements were at a non-polluted level. However, there were very few soils with extremely high ground accumulation index of Hg (4.03, belonging to the level of strong to extremely strong pollution). It was found that the content of Cd and Hg elements exceeded the background value of Chongqing soil, 2. 84 times and 1.38 times of the background value, respectively, with a cumulative effect; The content of Pb, Cr, As elements was slightly lower than the background value of Chongqing soil, and there was basi- cally no enrichment. The average content of heavy metals in the surveyed paddy soil was lower than the corresponding agricultural land soil risk screening value. Correlation and cluster analysis showed that heavy metal pollution mainly originated from soil formation processes and human factors. [Conclusion] The paddy soil in Chongqing is generally in a clean state, but there is a risk of Cd and Hg contamination. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Zhejiang University (Science Edition) is the property of Journal of Zhejiang University (Science Edition) Editorial Office 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.)

This paper briefly describes the mechanism of phytoremediation, the advantages and the application of ornamental woody plants. Based on the article analysis, it is found that the concept of hyper accumulation has been emphasized too much in the study of phytoremediation, the usage of herbal hyper-accumulator plants can not last for a long period in field level as the economic benefits is fairly low. Thus, the outstand advantages of ornamental woody plants are outlined, such as more biomass, casier management, pollution remediation and improvement of cultural environments. Relevant studies of remediation by ornamental woody plants are focused on variety, absorption characteristics and resistance assessment. Conclusion: ornamental woody plants show strong resistance and significant ability of metal adsorption. Ornamental woody plants have great potential in remediation of heavy metal comminuted soil. In the future, the theory of resistance and absorption should be strengthened. Other studies are also important, such as expanding the types of ornamental woody remediation plants and screening out more economic and effective plants. As a result, more and more ornamental plants will be put into practice in remediation. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology 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.)

Copyright of Chinese Journal of Pesticide Science / Nongyaoxue Xuebao is the property of Chinese Journal of Pesticide Science 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.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board 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.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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.)

The living environment of animals， plans and human beings has been seriously threatened by soil heavy metal pollution， so it’s urgently needed for cheap and efficient materials and methods to reduce their flow and migration. In this paper， soil column experiment was conducted to study the stabilization effect of hydroxyapatite（HAP)and the mixture of hydroxyapatite and fly ash （HAP+FA） on lead（Ⅱ)and cadmium(Ⅱ)in contaminated soil. It is indicated that the soil pH increased slightly with the addition of HAP and HAP+FA, and the concentration of heavy metals in the leachate was shown in this order: CK（without stabilizer） ＞ HAP+FA＞ FA. The migration of heavy metals in the soil treated with stabilizer was lower than that without stabilizer treatment. The stability efficiency of HAP was 7.5% and 2.79% higher than that of HAP+FA in lead-contaminated soil with initial concentration of 400mg/kg and 800mg/kg， respectively， and 2.5% and 0.51% higher than that of HAP+FA for cadmium-comtaminated soil with initial concentration of 400mg/kg and 800mg/kg， respectively. The stability efficiency of HAP for lead and cadmium is slightly higher than that of HAP+FA, and there was a better efficiency for the same concentration of lead of the same amount of stabilizer. [ABSTRACT FROM AUTHOR]

Copyright of Pearl River is the property of Pearl River Editorial Office 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.)

This paper reviews the application of silica nanomaterials in the field of heavy metals, and mainly introduces the progress and development trend of mesoporous silica nanomaterials, functional group modified silica nanomaterials and composite silica nanomaterials. Silica nanomaterials have the advantages of low cost, high specific surface, good stability and multiple modification ways, which are important development direction of heavy metal pollution control. This work also analyzes the future development trend and potential value of silicon dioxide nanomaterials, and puts forward some opinions and suggestions on the solutions to the technical problems still existing in the application of silicon dioxide nanomaterials in the field of heavy metals. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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.)

Copyright of Journal of Natural Resources / Ziran Ziyuan Xuebao is the property of Journal of Natural Resources 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.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture 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.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering 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.)

Copyright of Journal of Agricultural Resources & Environment / Nongye Ziyuan yu Huanjing Xuebao is the property of Journal of Agricultural Resources & Environment Editorial Board 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.)

Due to the rapid development of industry and agriculture in China, the pollution emission problems caused by farmland heavy metal pollution intensified. Heavy metal pollution in farmland is easy to cause crop reduction, soil environment, harm to human health and other adverse effects. This paper introduced the main sources of heavy metal pollution in farmland and its harm to crops and human bodies, and analyzed the characteristics of heavy metal pollution in farmland in the north and south of China. Based on the analysis and summary of the passivation restoration technology of the typical heavy metals Cu, Zn, Cd, Ni, Pb, Cr, As and Hg in farmland and the passivation restoration technology of the composite pollution of a variety of heavy metals in farmland, combined with the research status, the combination of restoration technology, space technology and evaluation method is proposed. In order to provide reference for the blunt repair of heavy metal pollution in farmland soil, it can be more effectively repaired, tested and evaluated. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences 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.)

Most of the heavy metal-related deposits are distributed in watersheds of mountainous areas, and the enrichment of soil heavy metals were affected by both natural high background and anthropogenic source in the area. It is particularly important to formulate precaution countermeasures to accurately identify and quantify the source of soil heavy metal pollution in the ore-concentrating area. This paper studies the surface soil of a small basin in Beishan Reservoir which was rich in ores. Based on the evaluation of the heavy metal accumulation degree, the pollution sources identification and their contributions to soil heavy metals were studied by multiple methods including field investigation, multivariate statistical analysis, positive matrix factorization(PMF), spatial analysis, and other methods. Conclusively, the accumulated Cu and Cd in the top soil were higher than other heavy metals, the Cu and Cd average contents were 3.05, 3.47 times as high as the regional background value, and exceeded the soil risk screening values. About 10% of samples reached the level of moderate to severe enrichment. The heavy metal pollution sources in the topsoil were jointly affected by natural geological background, mining activities, and agricultural activities source. The contribution rates of mining activities to Cu and Cd are 68.92% and 56.31%, and natural geological backgrounds also contribute 21.05% and 38.35% to them. The natural source contributed most to As, Cr, and Ni, with contribution rates of 83.13%, 72.59%, and 78.76%, respectively. Hg mainly comes from agricultural activities, and its contribution rate was 81.79%. Zn and Pb were affected by both material migration and natural geological background. The reliability and rationality of the analytical results for the heavy metal pollution sources can be improved by the mutual verification of the combination using different methods. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office 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.)

【Objective】The present paper aimed to analyze the blocking effect of different blocking inhibitors on cadmium（Cd） and arsenic（As） in heavy metal contaminated rice fields and their effect on the yield of different varieties of rice, in order to provide a reference basis for the screening of rice varieties with low accumulation of heavy metals and the production of safe rice.【Method】Using the field test method, 16 Guangxi main planted late rice varieties were planted in the soil with high risk of heavy metal pollution, and two kinds of inhibitors, selenium-inhibitor and silicon-inhibitor, were tested for heavy metal control. The Cd and As contents in the rice samples of each variety were measured, and the blocking effects of different blocking agents on Cd and As and the yields of different varieties of rice were compared and analyzed.【Result】The Cd and As contents of the 16 rice varieties differed significantly, among which five varieties, namely, Shenliangyou 8386,Guang 8 you jinzhan, Fengtianyou 553,Guixiang 12 and Guang 8 you 169,had lower Cd enrichment ability, and four varieties, namely, Yexiangyou 703,Hengfengyou 666,Guang 8 you jinzhan and Yexiangyou lisi, had lower As enrichment ability. The yield of each rice variety sprayed with selenium-inhibitor and silicon-inhibitor was significantly improved, with an average yield increase of 6.5% and 5.4%,respectively, compared with the control（CK）. After spraying selenium-inhibitor and silica-inhibitor, the Cd content of rice of 16 rice varieties was lower than 0.200 mg/kg, and the average content was 0.119 and 0.125 mg/kg, respectively, which were significantly lower than that of CK（0.189 mg/kg）. The average contents were 0.119 and 0.125 mg/kg, which were 37.03% and 33.33% lower than those of CK（P<0.05）. The mean As contents of rice were 0.197 and 0.185 mg/kg, respectively, which were not significantly different（P>0.05） compared to CK（0.186 mg/kg）.【Conclusion】The test results show that there are significant differences in the adsorption capacity of different late rice varieties of rice for heavy metals Cd and As.Foliar spraying of selenium and silicon inhibitors in Cd-contaminated rice fields can significantly improve rice yield and also significantly reduce the Cd content of rice, but has no significant effect on reducing the As content of rice. The five low Cd accumulation rice varieties, namely Shenliangyou 8386,Guang 8 you jinzhan, Fengtianyou 553,Guixiang 12 and Guang 8 you 169,can be promoted and planted in local Cd contaminated rice fields, and the four low As accumulation rice varieties, namely Yexiangyou 703,Hengfengyou 666,Guang 8 you jinzhan and Yexiangyou lisi, can be promoted and planted in local As contaminated rice fields. [ABSTRACT FROM AUTHOR]

Combined with the existing research, the research progress of biochar remediation of heavy metal pollution is reviewed. This paper focuses on the mechanism of biochar immobilization of heavy metals in soil, the effect of biochar on the absorption of heavy metals by plants, the research results of the application of biochar in field engineering, and the risks and shortcomings o£ biochar as a soil improver. Finally, it is hoped that on the premise of meeting safe production, the popularization of biochar should be promoted in agricultural production, rather than limited to scientific research. Start the life cycle assessment of biochar and establish a biochar life cycle database to provide a comprehensive and effective scientific basis for the future use of biochar. [ABSTRACT FROM AUTHOR]

Taking the heavy metal pollution caused by metal mining as the starting point, this paper fully analyzes several commonly used typical heavy metal pollution remediation measures, obtains their advantages and disadvantages, and gives reasonable suggestions. It is concluded that a variety of remediation methods should be combined in the future remediation process of soil heavy metal pollution, so as to be able to repair contaminated soil more reasonably. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology 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.)

Copyright of Nonferrous Metals (Mining Section) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group 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.)