Macleod, Christopher J. A. and Semple, Kirk T. (2003) Sequential extraction of low concentrations of pyrene and formation of non-extractable residues in sterile and non-sterile soils. Soil Biology and Biochemistry, 35 (11). pp. 1443-1450. ISSN 0038-0717Full text not available from this repository.
In this study, temporal changes in the extractability of C-14-pyrene, at native concentrations, were followed in two soils with differing organic matter contents, under sterile and non-sterile conditions over 24 weeks by a sequential solvent extraction scheme. No significant loss of the added C-14-pyrene was observed during the incubation. Significant decreases in methanol:water and n-butanol extractability were observed with increasing soil-pyrene contact time. Significant non-extractable residues were formed in all soils, with the largest increases found in the non-sterile soils. After 8 weeks soil-pyrene contact time, there was a significant increase in the rate and extent of sequestration of pyrene in the biologically active soils. This indicated that the aging of pyrene was initially a physical process, with active microbial communities increasing the rate and extent of residue formation after 8 weeks soil-pyrene contact time. These findings suggest that there is a need for longer term ageing experiments following the role of microbial communities on the formation of solvent non-extractable residues. The humin fraction of the soil organic matter contained the majority of the C-14-pyrene associated activity which was not extractable using the scheme of sequential solvents. Saponification of the soil humin resulted in the release of similar amounts of C-14-pyrene associated activity from sterile and non-sterile soils. Solvent extraction with methanol:water was found to significantly underestimate the bioavailable fraction, whereas n-butanol overestimated the bioavailability of the C-14-pyrene-associated activity when assessed by bacterial mineralization after 24 weeks soil-pyrene contact time. (C) 2003 Elsevier Ltd. All rights reserved.
|Journal or Publication Title:||Soil Biology and Biochemistry|
|Uncontrolled Keywords:||sequential solvent extraction ; bioavailability ; non-extractable residues ; microbial activity|
|Subjects:||G Geography. Anthropology. Recreation > GE Environmental Sciences|
|Departments:||Faculty of Science and Technology > Lancaster Environment Centre|
|Deposited By:||Prof Kirk T. Semple|
|Deposited On:||27 Oct 2008 09:07|
|Last Modified:||07 Jan 2015 13:03|
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