DETERMINATION SPECIATION OF HEAVY METALS IN SEDIMENT UNDER THE CAU RIVER BASIN

Abstract

    A five-step sequential extraction procedure was applied for the determination of the distribution  four elements (Zn, Cd, Pb, Cu) in sediment samples collected at Cau river. The accuracy evaluated by comparing total trace metal concentrations with the sum of the five individua fractions as well as standard material reference (MESS-3) proved to be satisfactory. Based on the results determined at Cau river, overall the total metal content as well as speciations content  in upper layers higher than the bottom layer. The metal is mainly distributed in the form of durable links, exchangable fractions and forms to associated with carbonates occupies the smallest amount in extraction forms five. Distribution forms don't major differences between the various positions. Keywords: Speciation Studies, Extraction, Heavy metals, Sediment, Cau River.