Analysis of organic contaminant desorption kinetic data for sediments and soils: Implications for the Tenax extraction time for the determination of bioavailable concentrations

被引:14
作者
van Noort, Paul C. M. [1 ,2 ]
Poot, Anton [1 ,3 ]
Koelmans, Albert A. [1 ,4 ]
机构
[1] Wageningen Univ, Aquat Ecol & Water Qual Management Grp, NL-6700 AA Wageningen, Netherlands
[2] Deltares, NL-3508 AL Utrecht, Netherlands
[3] Board Authorisat Plant Protect Prod & Biocides Ct, NL-6700 AE Wageningen, Netherlands
[4] Wageningen UR, IMARES Inst Marine Resources & Ecosyst Studies, NL-1976 CP Ijmuiden, Netherlands
关键词
Bioavailability; Non-extractable residue; Desorption; Rate constants; Tenax; POLYBROMINATED DIPHENYL ETHERS; IN-FIELD SEDIMENTS; BLACK CARBON; AVAILABILITY; INSECTICIDES; PYRETHROIDS; SORPTION; PREDICT; TOOL;
D O I
10.1016/j.scitotenv.2014.05.015
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Solid-phase extractions with adsorbents like Tenax have been widely used to assess bioaccessible or bioavailable concentrations and non-extractable residues (NER) of organic contaminants in soils or sediments. This paper presents an analysis of literature rate constants and fractions for rapid, slow and very slow contaminant desorption from soils and sediments. Contaminant fractions desorbed from sediment to Tenax in 6 or 24 h were evaluated as to their adequacy as a proxy for rapidly desorbing fractions, which have been shown to correlate with bioavailable concentrations. Desorption rate constants appear to decrease with increasing contaminant n-octanol-water partition coefficient. The ratio of the fraction of contaminant desorbed from sediment to Tenax in 6 h and the rapidly desorbing fraction appeared to slightly decrease on increasing contaminant hydrophobicity. This was not the case for the extraction for 24 h. Rapidly desorbing fractions or bioavailable fractions can be estimated, within a factor of 1.4, by multiplying the fraction desorbed in 24 h by a factor of 0.7. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:235 / 238
页数:4
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