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Lead (Pb) mobility in soils and hence its availability for plant uptake may be influenced by several soil properties, some of which are modified by sludge application. It is therefore imperative to understand how these modified properties affect Pb concentrations in different geochemical fractions of sludge-amended soils. Vertisols are common in arid- and semi-arid areas and are used extensively for agriculture. This study aimed at determining the relationship between selected soil properties (pH, organic matter (...