Trace element speciation study in street dust samples from Sakarya Organized Industrial district

Key words: Trace Element, BCR, ICP-OES, EDS, Organized Industrial District.The concentrations of heavy metals (Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn ) in 20 dust samples collected from the streets of the Organized Industrial District in Sakarya (Turkey) using sequential extraction procedure were determined by ICP-OES and scanning tunelling microscopy. The three-step BCR sequential extraction procedure was used in order to evaluate mobility, availability and persistence of trace elements in street dust samples. The sequential extractions were performed with 0,11 M CH3COOH, 0,5 M H2NOH.HCl, 8,8 M H2O2 + 1 M CH3COONH4 and aqua regia (3 HCl + 1 HNO3), respectiely, in triplicate analyses. Three operationally defined fractions isolated using the BCR procedure were: acid extractable, reducible, and oxidizable. In this study, performed by EDS, it was observed that the metals contents have decreased after the application of each sequential extraction stage and finally after the aqua regia leaching step, almost the heavy metals were not retained on the residue. Validation of the analytical results was checked by analysis of the BCR-701 certified reference material.