Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2009-11-01

Journal: CHEMOSPHERE

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 77

Issue: 10

Page Number: 1427-1433

ISSN: 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.