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| Home > Publications database > Distribution of Aged 14C-PCB and 14C-PAH Residues in Particle-Size and Humic Fractions of an Agricultural Soil |
| Home > Publications database > Distribution of Aged 14C-PCB and 14C-PAH Residues in Particle-Size and Humic Fractions of an Agricultural Soil |
| Journal Article | PreJuSER-47177 |
; ; ;
2005
American Chemical Society
Columbus, Ohio
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Please use a persistent id in citations: doi:10.1021/es050523c
Abstract: Organic matter is considered to be the single most important factor limiting availability and mobility of persistent organic pollutants (POPS) in soil. This study aimed to characterize the distribution of C-14- PCB (congeners 28 and 52) and C-14-PAH (fluoranthene and benzo[a]pyrene) residues in an Orthic Luvisol soil obtained from two lysimeter studies initiated in 1990 at the Agrosphere Institute (Forschungszentrum Julich GmbH, Germany). The lysimeter soils contained a low-density OM fraction, isolated during soil washing, which contained a significant fraction (3-12%) of the total C-14-activity. Soils were also fractionated according to three particle sizes: > 20, 20-2, and < 2,am. Relative affinity values of 14C-activity for the different article sizes varied in the order 20-2 mu m > (< 2 mu m) approximate to (> 20 mu m) for the PCBs. Relative affinity values of C-14 -activity for the different particle sizes varied in the order 20-2 mu m > (< 2 mu m) > (> 20 mu m) for the PAHs. The distribution of C-14-PCB or C-14- PAH residues in the organic and inorganic matrixes of the particle-size fractions was determined using methyl isobutyl ketone (MIBK). C-14- PCB and C-14-PAH-associated activities were primarily located in the humin fraction of the 20-2 and < 2 mu m particlesize fractions of the soil. A small fraction was associated with the fulvic and humic acid fractions; these were quantitatively more important for the PAHs than the PCBs. There appeared to be a high degree of association of 14C-activity with the mineral fraction following MIBK separation of the humic fractions, ranging between 8 and 52% for C-14-PCBs and 57-80% for C-14-PAHs. The mineral (inorganic) component of the soils apparently played a significant (previously unreported) role in the sequestration of both PCBs 28 and 52 and the PAHs fluoranthene and benzo[a]pyrene.
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