engleski

Speciation of heavy metals in fly ash using the bcr sequential extraction procedure

In this paper, speciation of heavy metals by BCR sequential extraction in flay ash generated from mixed wood biomass combustion facility in Udbina, Croatia was performed. A sequential extraction procedure, a three-step protocol proposed by the European Community Bureau of Reference (BCR), was applied for partitioning of heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in soil samples. This procedure provides measurements of extractable metals from media such as acetic acid (0.11 mol L-1), hidroxylammonium chloride (0.5 mol L-1) and hydrogen peroxide (8.8 mol L-1) plus ammonium acetate (1 mol L-1), which are exchangeable, reducible and oxidisable metals, respectively. The residue was treated with aqua regia solution for recovery studies, although this step is not part of the BCR procedure. Metals determination were carried out by inductively coupled plasma mass spectrometry (ICP-MS). Validation of the analytical results was checked analysis of the certified reference material of lake sediment BCR-701. The results obtained from the sequential extraction procedure were compared with pseudo total metal levels obtained with aqua regia digestion. The amounts of metals extracted by the sequential extraction procedure generally agreed well with pseudo total digestion results with aqua regia.

BCR sequential extraction ; biomass flay ash

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