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−1), iron (Fe = 214.8 ± 1.52 mgkg−1), lead (Pb = 0.854 ± 0.03 mgkg−1), nickel (Ni = 2.813 ± 0.4 mgkg−1), and arsenic (As = 1.753 ± 0.42 mgkg−1) when compared to permissible limits set by World Health Organization (WHO) and Food and Agricultural Organization (FAO) for food crops. Water from the study sites significantly (P ≤ 0.0001) had lower levels of heavy metals than the permissible limits set by FAO for irrigation of growing crops. Thus, the water sources appear to be safe for irrigation in the study area. Nonetheless, these sources of water in Nandom District had significantly higher levels of total suspended solids, turbidity, and coliforms that were above the maximum limits indicated in the guidelines of WHO and the Government of Ghana for drinking water. Therefore, treatments of water for drinking are required to minimize any potential threats to public health.
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Acknowledgements
This study was partially supported by Adaptation at Scale in Semi-Arid Regions (ASSAR). The authors thank the traditional and opinion leaders, smallholder farmers, and the Nandom District Assembly Officers for their support during data collection.
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The fieldwork of the present research received partial financial support from the Adaptation at Scale in Semi-Arid Regions (ASSAR) as part of the University of Ghana’s PhD Grant.
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IL conceived, designed the research, collected, analyzed, and interpreted the data; WKH analyzed, interpreted the data, discussed findings, reviewed the manuscript, carefully edited it, and made valuable inputs; CG was the principal PhD supervisor of the first author: therefore, he reviewed the manuscript and made valuable inputs; DN and PO were PhD co-supervisors of the first author: therefore, they reviewed the manuscript and made valuable inputs; RA-O and MYO-T reviewed and edited the manuscript with valuable inputs.
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Lente, I., Heve, W.K., Owusu-Twum, M.Y. et al. Assessing levels of selected heavy metals with other pollutants in soil and water resources in Nandom District in the semi-arid northwestern Ghana. Environ Monit Assess 194, 919 (2022). https://doi.org/10.1007/s10661-022-10619-2
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DOI: https://doi.org/10.1007/s10661-022-10619-2