Sequential Extraction and Risk Assessment of Potentially Toxic Elements in River Sediments

In this study, the sequential extraction method was applied to extract selected potentially toxic elements (PTEs) (Cd, Cr, Cu, Fe, Ni, Pb and Zn) in river sediments collected from Blood River situated Seshego area, Limpopo Province, South Africa. The study aimed assess a possible trend of mobilisation these sediment water. accuracy confirmed by analysing sediment-certified reference material, quantitative percentage recoveries ranging 86 119%, 81 111% 77 119% were achieved for exchangeable, reducible oxidisable fractions, respectively. potential risk PTEs evaluated. calculated values contamination factor (CF) as well assessment code (RAC) Cd, Ni revealed mobility elements. are at high toxicity-risk level could therefore cause threat organisms dwelling humans via consumption crops irrigated with polluted