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. 2021 Feb 4;16:803–832. doi: 10.2147/IJN.S294417

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© 2021 Salek Maghsoudi et al.

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Concentrations of heavy metals in global surface waters by continents from the 1970s to the present. Reprinted from Zhou Q, Yang N, Li Y, et al. Total concentrations and sources of heavy metal pollution in global river and lake water bodies from 1972 to 2017. Global Ecol Conserv. 2020;22:e00925. Copyright 2020, with permission from Elsevier.