SPECIATION OF HEAVY METALS IN SEDIMENT OF TRI AN LAKE

Abstract

    A five-sequential extraction procedure was applied for the determination of the distribution ofthree elements (Cu, Pb, Zn) in thirty-four sediment samples collected at Tri An lake by AtomicAbsorption Spectrometry (AAS). The accuracy evaluated by comparing the sum of the fiveindividual fractions with standard material reference (MESS-3) proved to be satisfactory.Based on the results determined, it seems that Tri An lake had been polluted. The resultsindicate that metals represent in sediment mostly in stable residual form and only smallfraction has capability of bioaccumulation (exchangeable and carbonate bound species).Total fraction of two bioaccumulation species is high in newly settling sediment. Thus, newlysediment has higher biological accumulation capability than the old one.