Sequential extraction procedure for fractionation of Pb and Cr in artificial and contaminated soil

Sequential extraction procedure for fractionation of Pb and Cr in artificial and contaminated soil

Abstract

manufacturing and use of synthetic products (e.g. pesticides,
paints, batteries, industrial waste and industrial or
domestic sludge) which is a serious environmental problem.
Hence, determining chemical forms of metals in soils
is important to evaluate their mobility or bioavailability.
Both artificial and contaminated soils were sequentially
extracted to fractionate metals into the water soluble
fraction
(WSF), exchangeable fraction (EF), bound to carbonate
fraction, bound to metal oxide fraction, organically
bound fraction (OBF) and residual fraction (RF). In
the case of contaminated soil, Pb and Cr are found to be
associated with the carbonate fraction while in artificial
soil, Pb bound to WSF and Cr with the Fe/Mn fraction.
Chemical properties such as pH, electrical conductivity
(EC) and textural classification of concerned soils were
also analyzed. Percentage recovery was calculated to
check the reliability of processes both in Pb and Cr, and
it was found to be more in Cr (66% and 84%) in both artificial
and contaminated soil than Pb (5% and 34%) in
both soils. Analyses of extracts were carried out by atomic
absorption spectrometry (AAS). Results were interpreted
in terms of environmental mobility or bioavailability of
metals.

No. of Pages
49–58
Volume
39
Author's Details
Sadia Qayyum, Ibrar Khan, Yangguo Zhao, Farhana Maqbool and Changsheng Peng
Research Field
Microbiology