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Temporal changes in the availability of pyrene in two soils under sterile and non-sterile conditions.

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Temporal changes in the availability of pyrene in two soils under sterile and non-sterile conditions. / Macleod, Christopher J. A.; Semple, Kirk T.

In: Soil Biology and Biochemistry, Vol. 35, No. 11, 11.2003, p. 1443-1450.

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Macleod, Christopher J. A. ; Semple, Kirk T. / Temporal changes in the availability of pyrene in two soils under sterile and non-sterile conditions. In: Soil Biology and Biochemistry. 2003 ; Vol. 35, No. 11. pp. 1443-1450.

Bibtex

@article{38777665d529434e9a82310561dbe76c,
title = "Temporal changes in the availability of pyrene in two soils under sterile and non-sterile conditions.",
abstract = "In this study, temporal changes in the extractability of 14C-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 14C-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 14C-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 14C-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 14C-pyrene-associated activity when assessed by bacterial mineralization after 24 weeks soil–pyrene contact time.",
keywords = "Sequential solvent extraction, Bioavailability, Non-extractable residues, Microbial activity",
author = "Macleod, {Christopher J. A.} and Semple, {Kirk T.}",
year = "2003",
month = nov,
language = "English",
volume = "35",
pages = "1443--1450",
journal = "Soil Biology and Biochemistry",
issn = "0038-0717",
publisher = "Elsevier Ltd",
number = "11",

}

RIS

TY - JOUR

T1 - Temporal changes in the availability of pyrene in two soils under sterile and non-sterile conditions.

AU - Macleod, Christopher J. A.

AU - Semple, Kirk T.

PY - 2003/11

Y1 - 2003/11

N2 - In this study, temporal changes in the extractability of 14C-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 14C-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 14C-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 14C-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 14C-pyrene-associated activity when assessed by bacterial mineralization after 24 weeks soil–pyrene contact time.

AB - In this study, temporal changes in the extractability of 14C-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 14C-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 14C-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 14C-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 14C-pyrene-associated activity when assessed by bacterial mineralization after 24 weeks soil–pyrene contact time.

KW - Sequential solvent extraction

KW - Bioavailability

KW - Non-extractable residues

KW - Microbial activity

M3 - Journal article

VL - 35

SP - 1443

EP - 1450

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

IS - 11

ER -