Sediment analysis--lability of selectively extracted fractions.
Contaminated sediment samples and wastes were extracted with a series of chemical solutions widely used in soil and sediment analyses. The Cu, Pb and Cd contents of the extracts were then determined by both AAS and ASV, and it was found that not all of the metal ion retrieved was "labile". Differences between selected extraction values were compared with the bonding-mode category values obtained by using a well-known sequential extraction procedure, and it was found that the series and sequential approaches yielded different results for Pb and Cu. The advantages and limitations of ASV monitoring in sediment studies are considered and the inappropriateness of some operationally defined fraction categories is indicated.
Aualiitia
T U
TU
Department of Chemistry, University of Newcastle, N.S.W. 2308, Australia.
Pickering
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WF