Download Investigation of trace metals in the shrimp aquaculture sludge in

Investigation of trace metals in the shrimp aquaculture sludge in Selangor,
Malaysia using BCR sequential extraction procedure
Keivan Nemati, Nor Kartini Abu Bakar, Mhd Radzi Abas
Environmental Research Group, Department of Chemistry, University of Malaya (U.M.), Kuala Lumpur 50603, Malaysia
Abstract
The mobility, availability and persistence of heavy metals (Cd, Cr, Cu, Mn, Fe, Zn and pb) in
sludge of shrimp aquaculture were evaluated by means of sequential extraction scheme,
proposed by the Community Bureau of Reference protocol (BCR). The original BCR three-step
sequential extraction procedure was used to examine the potential mobility of trace elements in
contaminated sludge of shrimp aquaculture sludge in Selangor south-west Malaysia. The metal
content in the extracts was measured by atomic absorption spectrometry. The precision and
accuracy of proposed procedure were evaluated by using psedototal aqua regia extraction. From
the analysis, Fe and Mn were found to be highest concentrated metals compared to Zn, Cu, Cr,
Cd and Pb in aquaculture shrimp sludge. From the sequential extraction, Cd, Mn and Pb were
mostly found in exchangeable/carbonate form, showed its susceptibility to be leached easily.
Also Cu and Zn were extracted predominantly in oxidizable form. All metal concentrations
(except Cd, Zn and Cu) were extracted to be higher in residual fraction in this method.