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Abstract
This paper focuses on 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. The three-step BCR sequential extraction procedure was used in order to evaluate mobility, availability and persistence of heavy elements in street dust samples. Three operationally defined fractions isolated using the BCR procedure was: acid extractable, reducible, and oxidizable. The mobility sequence based on the sum of the BCR sequential extraction stages: Cd (82.3%) > Mn (80.0%) > Zn (78.8%) > Cu (70.2%) > Ni (65.9%) > Pb (63.8%) > Cr (47.3%) > Co (32.6%). Validation of the analytical results was checked by analysis of the BCR-701 certified reference material. The concentrations of metals in the street dust samples have been shown a decrease after the each extraction stage. KEY WORDS : Heavy metals, ICP-OES, Organized industrial district, Sequential extraction, Dust, Turkey Bull. Chem. Soc. Ethiop. 2013 , 27(2), 205-212. DOI: http://dx.doi.org/10.4314/bcse.v27i2.5
Highlights
The presence of heavy metals pollution is of great concern since their harmful effects on human health and the environment [1,2,3,4]
The results of heavy metal partitioning in street dust samples were analyzed with three-stage sequential extraction procedures
The scanning electron microscope (SEM) is capable of performing analyses of selected point locations on the sample; this approach is especially useful in qualitatively or semi-quantitatively determining chemical compositions [38]. In these studies, performed by SEM, it was observed that the metals contents have decreased after the application of each sequential extraction stage and after the aqua regia leaching step, almost the heavy metals were not retained on the residue
Summary
The presence of heavy metals pollution is of great concern since their harmful effects on human health and the environment [1,2,3,4]. The Standards, Measurements and Testing Programme (formerly BCR) of the European Commission proposed a three-step sequential extraction procedure that was used to determine the fractionation of trace metals, as operationally defined exchangeable and acid soluble, bound to Fe-Mn oxides, bound to organic matter and sulfites, and residual fractions [23]. Sequential extraction is a well-established method for the fractionation of heavy metal content in soils, sediments, dust and related materials [24].
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