Speciation of Heavy Metals in Sediments Sampled from Different Pollution Sources of Lake Dang, Ngaoundere-Cameroon

C. Kapseu; A. Ali; J. M. Sieliechi; G.B. G.B. Noumi; M. Fadimatou
The speciation of five trace metallic elements (Cr, Pb, Ni, Zn, Cu) in sediments from Lake Dang Ngaoundere Cameroon was carried out by the sequential extraction technique. Samples were collected in six points (waste water from the university hostels (WUH), from university restaurant (WUR), from vehicle washing stations (WWS), from cultivated areas (WGA), from neighbouring villages (WNV) and water out of lake (WOL)) around the lake during the rainy season. The metallic elements were measured by flame atomic absorption spectrometry. Results of the sequential extraction revealed that apart from Ni, other elements were weakly adsorbed on the surface of sediments. Trace metallic elements were mostly present in the exchangeable or acido-soluble forms in sediments. Unlike Zn and Cu, other elements (Cr, Pb, Ni) were strongly trapped by oxides of iron, manganese and aluminum. From this study, it appears that WUH contributes to pollution of the lake due to the high content of the five elements (> 100 mg/Kg) found in the lake sediment. WUR and those of neighboring villages (WNV) were rich in Cr (158.78±0.83 and 427.85±1.74 mg/kg respectively). WGA also contributed to pollution of the lake due to the presence of Ni (1020.09±4.75) mg/kg, Cr (251.80±1.14) mg/kg and Pb (208.98±1.74) mg/kg revealed in it.
Speciation; Sediments; Lake Dang; Heavy Metal; Pollution
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