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4 results on '"Ishmael Lente"'

1. Preliminary investigation on the occurrence and health risk assessment of antibiotics in cultured tilapia retailed at a commercial outlet in Tema, Ghana

Author

Emmanuel Kaboja Magna, Francis Ofosu-Koranteng, Ruby Asmah, Emmanuel Tetteh-Doku Mensah, Ebenezer Koranteng Appiah, Patrick Senam Fatsi, Frank Adu-Nti, Zenobia Castel Kpodo, and Ishmael Lente

Subjects
Antibiotics, Tilapia, UHPLC/MS/MS, Tema, Health risk, Science (General), Q1-390, Social sciences (General), H1-99
Abstract

In Ghana, Nile tilapia is one of the most commonly cultivated fish species. Bacterial infections, which mostly occur in intensive fish farming, are considered to be the most significant health issue facing these culture systems in Ghana's aquaculture industry. To prevent, and treat bacterial infections and promote fish growth, antimicrobials are often used, and in most cases at unregulated doses. However, this misuse and neglect of withdrawal durations for such antimicrobials may result in drug residues showing up in fish edible tissue, posing a risk to human consumers. To evaluate the risk to consumers, this study screened for antibiotic residues in popular tilapia fish sold at a retail outlet in Tema. Using ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC/MS/MS), the study analysed the levels of 12 antibiotics present in 24 tilapia samples sold at a retail outlet in Tema. Erythromycin, tetracycline, oxytetracycline, and amoxicillin were detected at varying levels, with frequencies of 20.8 %, 62.5 %, 58.3 %, and 54.2 %, respectively. The highest concentration of 3.521 ± 0.32 μg/kg was found for oxytetracycline, while erythromycin had the lowest concentration (0.276 ± 0.11 μg/kg) in the samples. According to the study, the levels of antibiotics detected in the sampled tilapia were lower than the maximum residue limits (MRL) recommended by the WHO. Additionally, both the hazard quotient (HQ) and hazard index (HI) values were less than one. Therefore, consuming retail farmed tilapia purchased from the commercial outlet in Tema metropolis was deemed to pose no significant risk to human health. However, regular monitoring of antibiotics and other contaminants is necessary to minimise their potential impacts on human health.

Published
2024
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2. Electronic waste control and management in Ghana: A critical assessment of the law, perceptions and practices

Author

Maxwell Y Owusu-Twum, Gifty Kumi-Amoah, William K Heve, Ishmael Lente, Seth Anim Owusu, Lloyd Larbi, and Richard Amfo-Otu

Subjects
Environmental Engineering, Waste Management, Ghana, Pollution, Electronic Waste, Refuse Disposal
Abstract

The aim of the study was to assess the impact of Ghana’s hazardous and e-waste control and management Act 917 of 2016 on current e-waste management practices and the level of awareness among key stakeholders (general public, repairers, wholesalers/retailers, recyclers and importers of electronic items) in the Greater Accra Region of Ghana. Both quantitative and qualitative data were collected and examined in this study. Results showed a low level (12%) of awareness among stakeholders on the e-waste legislation. Almost 13% of respondents had been educated on e-waste management. Community engagement and the mass media were the main sources of information on e-waste. Significant associations between background information of respondents and awareness level on ‘Ghana’s Act 917’ were observed. Relative to general e-waste issues, only education and stakeholder showed significant associations with e-waste legislation and management. The main e-waste disposal methods adopted by respondents were disposal at dumpsites (22.7%), repair and reuse (21.1%) and reselling (20.1%). Almost 10% of respondents made changes to their e-waste disposal practices over the past 5 years. These changes were mainly due to the economic benefits derived from reselling e-waste (37.6%) and the perceived adverse impacts of e-waste on the environment (23.9%). Overall, there is the need to intensify awareness on ‘Ghana’s Act 917’, especially issues regarding sustainable e-waste management practices.

Published
2022

3. Assessing levels of selected heavy metals with other pollutants in soil and water resources in Nandom District in the semi-arid northwestern Ghana

Author

Ishmael Lente, William K. Heve, Maxwell Y. Owusu-Twum, Christopher Gordon, Pabi Opoku, Daniel Nukpezah, and Richard Amfo-Otu

Subjects
Crops, Agricultural, Chromium, Drinking Water, Iron, General Medicine, Management, Monitoring, Policy and Law, Pollution, Ghana, Risk Assessment, Arsenic, Soil, Lead, Nickel, Metals, Heavy, Water Resources, Soil Pollutants, Environmental Pollutants, General Environmental Science, Environmental Monitoring
Abstract

This study assessed heavy metal contaminations of soils in cultivated fields (or farms) and water samples from rivers, boreholes, and dug-out wells in Nandom District in semi-arid northwestern Ghana. Other parameters of water from the three sources were also measured and then compared to the permissible limits in the literature. The results showed that soils in farms across the study communities significantly (P ≤ 0.05) had higher levels of chromium (Cr = 0.456 ± 0.132 mgkg

Published
2022

4. Risk Assessment of Heavy-Metal Contamination on Vegetables Grown in Long-Term Wastewater Irrigated Urban Farming Sites in Accra, Ghana

Author

Ishmael Lente, Abdul K. Brimah, Pay Drechsel, Bernard Keraita, and John Ofosu-Anim

Subjects
Cadmium, Metal contamination, Potential risk, business.industry, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Environmental engineering, chemistry.chemical_element, Contamination, Pollution, Toxicology, chemistry, Wastewater, Agriculture, Vegetable farming, Environmental science, business, Risk assessment, Water Science and Technology
Abstract

Assessment was done of heavy-metal contamination and its related health risks in urban vegetable farming in Accra. Samples of irrigation water (n=120), soil (n=144) and five different kinds of vegetable (n=240) were collected and analyzed for copper, zinc, lead, cadmium, chromium, nickel and cobalt. All water, soil and vegetable samples contained detectable concentrations of each of the seven heavy metals except for irrigation water which had no detectable chromium, cadmium and cobalt. All heavy-metal levels were below permissible limits except lead on vegetables which was 1.8–3.5 times higher. Health risk assessments showed for all elements that normal consumption of each of the vegetables assessed poses no risk. The highest hazard index obtained was 42 % for wastewater irrigated cabbage. Though within permissible limits, cabbage and ayoyo had the highest potential risk. Compared with previous studies on the same sites, the data show that the risk from heavy metals is less significance than that from pathogen contamination which has positive implications for risk mitigation.

Published
2012

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