Abstract
This study is carried out to understand the degree of soil pollution, transport mechanism, and distribution pattern of potentially toxic elements (PTEs), including the exposure effects on human health. Towards this, topsoil samples were collected from the Saman wetland and surrounding agricultural fields in the Gangetic plain, India. The results show that the mean concentration of Cu, Hg, Zn, Pb, Th, As, U, and Cd of both soil types exceed the natural background values. The multivariate analysis suggests the soils are moderately contaminated with As, Cd, Zn, Pb, and Hg (possibly from anthropogenic sources) and heavily contaminated with Th and U, likely ascended from geogenic sources. The GIS-based geostatistical plots coupled with principal component analysis (PCA) and hierarchical cluster analysis (HCA) apportion the sources of these toxic elements, which vary greatly and are closely correlated to the geogenic processes and local anthropogenic sources like pesticides and agrochemicals. The health risk assessment revealed that the cumulative hazard index (HI) values of PTEs are lower than the safe level, suggesting no significant noncarcinogenic effect for adults and children. However, excess cancer risk (ECR) values exceed the permissible limit (1 × 10−6), signifying that exposure to the toxic element concentration may cause cancer in the exposed population, most probably in the children subpopulation. Thus, this study highlights the importance of local compliance, ensuring the quality checks and management policies in using pesticides and other agrochemicals containing PTEs to control the imposed cancer risks.
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Data availability
The analyzed data which support the findings of this study are available in the material of this article and also available from the corresponding author on request.
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Acknowledgements
The authors are grateful to the director, CSIR-NGRI, Hyderabad, for the support and encouragement during this research work. IK expresses his special thanks to Dr. Tavheed Khan and Mohammad Qasim (CSIR-NGRI, Hyderabad) for their help during the HR-ICP-MS analysis. Partially this manuscript is completed while IK is availing Dr. D.S. Kothari Postdoctoral Fellowship (No.F.4-2/2006(BSR)/ES/20-21/0012 [University Grants Commission (UGC), Department of Higher Education, Ministry of Education, Government of India] at the Department of Geology, AMU, Aligarh).
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IK acknowledges the financial support from the University Grants Commission (UGC), Department of Higher Education, Ministry of Education, Government of India, in the form of Dr. D.S. Kothari Postdoctoral Fellowship (No. F. 4–2/2006(BSR)/ES/20–21/0012) at the Department of Geology, AMU, Aligarh-202002.
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IK conceived the idea, did the fieldwork, and wrote the original manuscript. BC and SI reviewed and contributed to writing the original manuscript. MS, DK, and SK analyzed soil samples, reviewed, and contributed to writing the manuscript. VDR reviewing and editing.
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Khan, I., Choudhary, B.C., Izhar, S. et al. Exploring geochemical distribution of potentially toxic elements (PTEs) in wetland and agricultural soils and associated health risks. Environ Sci Pollut Res 31, 17964–17980 (2024). https://doi.org/10.1007/s11356-023-25141-2
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DOI: https://doi.org/10.1007/s11356-023-25141-2