The effect of long-term irrigation using wastewater on heavy metal contents of soils under vegetables in Harare, Zimbabwe [An article from: Agriculture, Ecosystems and Environment]

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Description:
The magnitude of contamination, regulatory compliance and annual loadings of soils with copper (Cu), zinc (Zn), cadmium (Cd), nickel (Ni), chromium (Cr) and lead (Pb) were determined at three sites in Harare where wastewater was used to irrigate vegetable gardens for at least 10 years. Heavy metal total concentrations (mgkg^-^1) in sandy and sandy-clay soils of pH 5.1-8.1 from all sites ranged from 7.0 to 145 for Cu, 14 to 228 for Zn, 0.5 to 3.4 for Cd,