Speciation of chromium, copper, iron, manganese, nickel, and zinc of sediment from the Densu River by sequential extraction

Total concentrations of the broad metal spectrum and speciation of Cr, Cu, Fe, Ni, Mn and Zn in sediments of River Densu are studied in order to establish the extent of pollution and their capacity of remobilization. Eight composite samples were analyzed, major components of the sediments were studied using Instrumental Neutron Activation Analysis (INAA) and Atomic Absorption Spectrophotometer (AAS). From the results obtained, it can be concluded that the sediment has Cd value above the normal range. The distribution of the elements in various fractions depends largely on the element. Most of the elements have the bulk of their concentration in the residual fraction. (author)