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Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:CHEMOSPHERE

Included Journals:SCIE、EI、PubMed、Scopus

Volume:77

Issue:10

Page Number:1427-1433

ISSN No.:0045-6535

Key Words:Soil/air partition coefficient; Subzero temperatures; PCBs; Environmental fate

Abstract:Soil/air partition coefficients (K-SA) were measured experimentally on a silty clay loam soil spiked with polychlorinated biphenyls (PCBs) over a wide range of environmentally relevant temperatures (-30 to +30 degrees C). Measured K-SA-values ranged over 6.4 orders of magnitude, with log K-SA from 4.3 for PCBs 10/4 at +30 degrees C to 10.7 for PCBs 77/110 at -30 degrees C. Higher than expected, K-SA-values were observed at subzero temperatures (by up to one order of magnitude, at -30 degrees C). The plots of log K-SA vs. reciprocal absolute temperature show a change in slope at 0 degrees C. A log-log linear regression of K-SA vs. octanol/air partition coefficient (K-OA) has a slope close to 1, indicating that K-OA is a good descriptor of the interchemical variability in K-SA. Further study showed that K-OA-based Karickhoff-type equations can perfectly fit experimental K-SA-values. (C) 2009 Elsevier Ltd. All rights reserved.