Bottom sewage sediments from six locations of Lahore city were studied to evaluate total concentration of selected heavy metals and also their chemical speciation using sequential chemical extraction method. Analyses of the extracts were carried out by atomic adsorption spectroscopy. The total concentration OF metals were in the sequence Fe> Mn> Ni> Cu> Zn> Co. the metals were partitioned into five operationally defined fractions i.e. exchangeable, bound to carbonate, associated with Fe-Mn oxides, associated with organic fractions and residual. Speciation analysis showed that the most of the metals were in the residual fraction. The next considerable proportion is associated with Fe-Mn oxides, than with organic fraction and least with carbonate and exchangeable fraction.
M A KHASMIRI ,T SHAFIQUE ,M TARIQUE ,F BASHIR ,
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