THE CHEMICAL FRACTIONS OF HEAVY METALS IN THE SEDIMENT OF KOYCEGIZ LAKE (MUĞLA-TURKEY)

Ahmet Demirak, Feyyaz Keskin, Yalçın Şahin
Mugla University, Science Faculty, Department of Chemistry, Turkey

Abstract

The Köyceğiz lake is located in south-western Turkey and was declared as Private Environment Protection Area in 1988. Köyceğiz Lake Basin has attracted many researchers, environment protectors and tourism investors intensively with its natural and cultural assets since 1988.  Although there have been studies on total heavy metal pollution in Köyceğiz Lake but there are not on studies that the basis of heavy metal fractions. The determination of total heavy metal concentrations can be only used as a global index in terms of heavy metalpollution. But they do not provide information about the toxicity, bioavailability, and resources of heavy metals. Chemical fractions of heavy metals need to be explored in order to obtain this information.
In this study, five stations were selected in Köyceğiz Lake and sediment samples were collected by Eckmann Grab twice in November 2011 and January 2012. Chemical fractions of heavy metals (Fe,Mn,Ni,Cu,Cd,Cr,Pb,Zn) in the sediment samples and physico-chemical parameters of the sediment samples were analyzed. The chemical fractions of the heavy metals were studied using three stage extraction procedure proposed by the Community Bureau of Reference (BCR) and the heavy  metals concentrations were determined by ICP-AES. The results show that heavy metals in the sediment of Köyceğiz Lake may be risk future times.