1. Temperature-dependence of soil/air partition coefficient for polychlorinated biphenyls at subzero temperatures.
- Author
-
He X, Chen S, Quan X, Liu Z, and Zhao Y
- Subjects
- Aluminum Silicates chemistry, Clay, Environmental Restoration and Remediation, Polychlorinated Biphenyls metabolism, Soil Pollutants metabolism, Temperature, Air, Polychlorinated Biphenyls chemistry, Soil, Soil Pollutants chemistry
- 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.
- Published
- 2009
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