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Title: Slowly and very slowly desorbing organic compounds in sediments exhibit Langmuir-type sorption

Abstract

Desorption kinetics were determined for 1,2,4-trichlorobenzene (TCB), 1,3-dichlorobenzene (DCB), and trichloroethylene (TCE) in a sediment at various concentrations. The desorption data were interpreted with a (nonmechanistic) first-order three-compartment model. In this way, separate sorption isotherms could be constructed for rapidly, slowly, and very slowly desorbing sorbate, respectively. Slowly desorbing (rate constant k {approximately} 10{sup {minus}3}/h) and very slowly desorbing (k = 10{sup {minus}4} to 10{sup {minus}5}/h) sorbate exhibited nonlinear Langmuir-type sorption, with capacities on the order of 4.6 to 19 and 0.54 to 1.5 mmol/kg organic carbon (OC) and affinity constants of 0.18 to 41 and 32 to 272 L/mmol, respectively. The affinity constants increased with increasing sorbate hydrophobicity. Rapidly desorbing sorbate showed linear sorption isotherms, with log K{sub oc} of 1.59 {+-} 0.12 (TCE), 2.03 {+-} 0.13 (DCB), and 3.13 {+-} 0.03 (TCB), respectively. These results confirm the hypothesis that desorption is rapid from linearly sorbing organic matter, whereas it is slow and very slow from nonlinearly sorbing sites. Furthermore, the results also demonstrate the applicability of the desorption kinetic method in terms of experimentally separating an overall Freundlich-like isotherm in linear and nonlinear isotherms.

Authors:
; ; ;
Publication Date:
Research Org.:
Inst. for Inland Water Management and Waste Water Treatment, Lelystad (NL)
OSTI Identifier:
20062539
Alternate Identifier(s):
OSTI ID: 20062539
Resource Type:
Journal Article
Journal Name:
Environmental Toxicology and Chemistry
Additional Journal Information:
Journal Volume: 19; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 0730-7268
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; WATER POLLUTION; SEDIMENTS; CHLORINATED AROMATIC HYDROCARBONS; CHLORINATED ALIPHATIC HYDROCARBONS; DESORPTION; ADSORPTION ISOTHERMS

Citation Formats

Cornelissen, G., Rigterink, H., Noort, P.C.M. van, and Govers, H.A.J. Slowly and very slowly desorbing organic compounds in sediments exhibit Langmuir-type sorption. United States: N. p., 2000. Web. doi:10.1897/1551-5028(2000)019<1532:SAVSDO>2.3.CO;2.
Cornelissen, G., Rigterink, H., Noort, P.C.M. van, & Govers, H.A.J. Slowly and very slowly desorbing organic compounds in sediments exhibit Langmuir-type sorption. United States. doi:10.1897/1551-5028(2000)019<1532:SAVSDO>2.3.CO;2.
Cornelissen, G., Rigterink, H., Noort, P.C.M. van, and Govers, H.A.J. Thu . "Slowly and very slowly desorbing organic compounds in sediments exhibit Langmuir-type sorption". United States. doi:10.1897/1551-5028(2000)019<1532:SAVSDO>2.3.CO;2.
@article{osti_20062539,
title = {Slowly and very slowly desorbing organic compounds in sediments exhibit Langmuir-type sorption},
author = {Cornelissen, G. and Rigterink, H. and Noort, P.C.M. van and Govers, H.A.J.},
abstractNote = {Desorption kinetics were determined for 1,2,4-trichlorobenzene (TCB), 1,3-dichlorobenzene (DCB), and trichloroethylene (TCE) in a sediment at various concentrations. The desorption data were interpreted with a (nonmechanistic) first-order three-compartment model. In this way, separate sorption isotherms could be constructed for rapidly, slowly, and very slowly desorbing sorbate, respectively. Slowly desorbing (rate constant k {approximately} 10{sup {minus}3}/h) and very slowly desorbing (k = 10{sup {minus}4} to 10{sup {minus}5}/h) sorbate exhibited nonlinear Langmuir-type sorption, with capacities on the order of 4.6 to 19 and 0.54 to 1.5 mmol/kg organic carbon (OC) and affinity constants of 0.18 to 41 and 32 to 272 L/mmol, respectively. The affinity constants increased with increasing sorbate hydrophobicity. Rapidly desorbing sorbate showed linear sorption isotherms, with log K{sub oc} of 1.59 {+-} 0.12 (TCE), 2.03 {+-} 0.13 (DCB), and 3.13 {+-} 0.03 (TCB), respectively. These results confirm the hypothesis that desorption is rapid from linearly sorbing organic matter, whereas it is slow and very slow from nonlinearly sorbing sites. Furthermore, the results also demonstrate the applicability of the desorption kinetic method in terms of experimentally separating an overall Freundlich-like isotherm in linear and nonlinear isotherms.},
doi = {10.1897/1551-5028(2000)019<1532:SAVSDO>2.3.CO;2},
journal = {Environmental Toxicology and Chemistry},
issn = {0730-7268},
number = 6,
volume = 19,
place = {United States},
year = {2000},
month = {6}
}