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Title: Determining PCB sorption/desorption behavior on sediments using selective supercritical fluid extraction. 3: Sorption from water

Abstract

Supercritical fluid extraction (SFE) with pure CO{sub 2} was used to quantitatively remove PCBs from historically contaminated sediments without substantially disturbing their bulk organic or inorganic matrix as evidenced by only small or undetectable changes in thermal gravimetric behavior, elemental composition, ionic conductivity, and pH determined before and after SFE. The extracted PCBs were then spiked into water with the parent sediment, and sorption was allowed to occur for up to 18 days. The selective SFE conditions developed in part 1 were used to determine the proportion of PCBs which could be extracted under four conditions of increasing stringency. Comparing the selective SFE behavior of the PCBs from the water/sediment sorption samples to the original historically contaminated sediments demonstrated that 18 days was not sufficient for PCBs to migrate to the slower sediment-binding sites, which the PCBs had occupied in the historically contaminated sediments and that the adsorbed PCBs were primarily associated with the binding sites most easily extracted by SFE. Sediment/water distribution coefficients at 18 days were similar for sediments with low contamination levels.

Authors:
;  [1]; ;  [2]
  1. Univ. of North Dakota, Grand Forks, ND (United States). Energy and Environmental Research Center
  2. Univ. of Lund (Sweden). Dept. of Analytical Chemistry
Publication Date:
OSTI Identifier:
687354
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 33; Journal Issue: 18; Other Information: PBD: 15 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; WATER POLLUTION; REMEDIAL ACTION; SEDIMENTS; POLYCHLORINATED BIPHENYLS; SORPTION; DESORPTION; SUPERCRITICAL STATE

Citation Formats

Hawthorne, S.B., Boewadt, S., Bjorklund, E., and Mathiasson, L. Determining PCB sorption/desorption behavior on sediments using selective supercritical fluid extraction. 3: Sorption from water. United States: N. p., 1999. Web. doi:10.1021/es981072h.
Hawthorne, S.B., Boewadt, S., Bjorklund, E., & Mathiasson, L. Determining PCB sorption/desorption behavior on sediments using selective supercritical fluid extraction. 3: Sorption from water. United States. doi:10.1021/es981072h.
Hawthorne, S.B., Boewadt, S., Bjorklund, E., and Mathiasson, L. Wed . "Determining PCB sorption/desorption behavior on sediments using selective supercritical fluid extraction. 3: Sorption from water". United States. doi:10.1021/es981072h.
@article{osti_687354,
title = {Determining PCB sorption/desorption behavior on sediments using selective supercritical fluid extraction. 3: Sorption from water},
author = {Hawthorne, S.B. and Boewadt, S. and Bjorklund, E. and Mathiasson, L.},
abstractNote = {Supercritical fluid extraction (SFE) with pure CO{sub 2} was used to quantitatively remove PCBs from historically contaminated sediments without substantially disturbing their bulk organic or inorganic matrix as evidenced by only small or undetectable changes in thermal gravimetric behavior, elemental composition, ionic conductivity, and pH determined before and after SFE. The extracted PCBs were then spiked into water with the parent sediment, and sorption was allowed to occur for up to 18 days. The selective SFE conditions developed in part 1 were used to determine the proportion of PCBs which could be extracted under four conditions of increasing stringency. Comparing the selective SFE behavior of the PCBs from the water/sediment sorption samples to the original historically contaminated sediments demonstrated that 18 days was not sufficient for PCBs to migrate to the slower sediment-binding sites, which the PCBs had occupied in the historically contaminated sediments and that the adsorbed PCBs were primarily associated with the binding sites most easily extracted by SFE. Sediment/water distribution coefficients at 18 days were similar for sediments with low contamination levels.},
doi = {10.1021/es981072h},
journal = {Environmental Science and Technology},
number = 18,
volume = 33,
place = {United States},
year = {1999},
month = {9}
}