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Selective supercritical fluid extraction to estimate the fraction of PCB that is bioavailable to a benthic organism in a naturally contaminated sediment

Nilsson, Tobias LU ; Sporring, Sune LU and Björklund, Erland LU (2003) In Chemosphere 53(8). p.1049-1052
Abstract
Selective supercritical fluid extraction (SFE) at 40 °C, 120 bar and 60 min was utilised as a means to estimate the bioavailable fraction of PCBs to chironomid larvae in a naturally contaminated limnic sediment. This extraction methodology removed about 50% of the PCBs from the sediment. According to the equilibrium partitioning theory, organisms in that sediment should decrease their uptake from the sediment to the same extent, biota-to-sediment accumulation factors (BSAFs) thus remaining constant. Surprisingly, the BSAFs for 11 PCB congeners decreased some 40% for the selectively extracted sediment as compared to BSAFs for organisms dwelling in untreated sediment. The results were statistically significant at the 0.001 level using a... (More)
Selective supercritical fluid extraction (SFE) at 40 °C, 120 bar and 60 min was utilised as a means to estimate the bioavailable fraction of PCBs to chironomid larvae in a naturally contaminated limnic sediment. This extraction methodology removed about 50% of the PCBs from the sediment. According to the equilibrium partitioning theory, organisms in that sediment should decrease their uptake from the sediment to the same extent, biota-to-sediment accumulation factors (BSAFs) thus remaining constant. Surprisingly, the BSAFs for 11 PCB congeners decreased some 40% for the selectively extracted sediment as compared to BSAFs for organisms dwelling in untreated sediment. The results were statistically significant at the 0.001 level using a paired t-test. This can only be interpreted so that selective SFE removed easily available PCBs preferentially, leaving more tightly bound PCBs behind. Hence, by fine-tuning extraction conditions, this methodology might be used to estimate bioavailable fractions by chemical means. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Bioavailability, PCB, SFE, Sediment
in
Chemosphere
volume
53
issue
8
pages
1049 - 1052
publisher
Elsevier
external identifiers
  • wos:000186102400029
  • pmid:14505728
  • scopus:0642279686
ISSN
1879-1298
DOI
10.1016/S0045-6535(03)00615-5
language
English
LU publication?
yes
id
9a621c7a-cecf-4fe3-ae33-5ef198f4569a (old id 128947)
date added to LUP
2007-06-27 13:20:03
date last changed
2018-01-07 05:44:38
@article{9a621c7a-cecf-4fe3-ae33-5ef198f4569a,
  abstract     = {Selective supercritical fluid extraction (SFE) at 40 °C, 120 bar and 60 min was utilised as a means to estimate the bioavailable fraction of PCBs to chironomid larvae in a naturally contaminated limnic sediment. This extraction methodology removed about 50% of the PCBs from the sediment. According to the equilibrium partitioning theory, organisms in that sediment should decrease their uptake from the sediment to the same extent, biota-to-sediment accumulation factors (BSAFs) thus remaining constant. Surprisingly, the BSAFs for 11 PCB congeners decreased some 40% for the selectively extracted sediment as compared to BSAFs for organisms dwelling in untreated sediment. The results were statistically significant at the 0.001 level using a paired t-test. This can only be interpreted so that selective SFE removed easily available PCBs preferentially, leaving more tightly bound PCBs behind. Hence, by fine-tuning extraction conditions, this methodology might be used to estimate bioavailable fractions by chemical means.},
  author       = {Nilsson, Tobias and Sporring, Sune and Björklund, Erland},
  issn         = {1879-1298},
  keyword      = {Bioavailability,PCB,SFE,Sediment},
  language     = {eng},
  number       = {8},
  pages        = {1049--1052},
  publisher    = {Elsevier},
  series       = {Chemosphere},
  title        = {Selective supercritical fluid extraction to estimate the fraction of PCB that is bioavailable to a benthic organism in a naturally contaminated sediment},
  url          = {http://dx.doi.org/10.1016/S0045-6535(03)00615-5},
  volume       = {53},
  year         = {2003},
}