W. Calmano et al., An XAFS investigation of the artefacts caused by sequential extraction analyses of Pb-contaminated soils, FRESEN J AN, 371(6), 2001, pp. 823-830
The chemical processes that occur during sequential extraction of a highly
Pb-contaminated soil sample were investigated using XAFS spectroscopy for t
he identification of the Pb species in the solid residues after each step.
The sequential extraction was performed following the procedure described b
y Salomons and Forstner [1]. It was found that during the sequential extrac
tion serious alteration of the chemical binding forms of the Ph occurs. The
most important processes underlying the chemical changes are the re-adsorp
tion of solubilized Pb ions by soil matrix components and the precipitation
of insoluble Pb species with anions from the extractant.