Temperature-dependence of soil/air partition coefficient for polychlorinated biphenyls at subzero temperatures.
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.
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China.
Xin
X
He
Shuo
S
Chen
Xie
X
Quan
Zhenyu
Z
Liu
Yazhi
Y
Zhao
D000388:Air; D000538:Aluminum Silicates / Q000737:chemistry; D000077215:Clay; D052918:Environmental Restoration and Remediation; D011078:Polychlorinated Biphenyls / Q000737:chemistry* / Q000378:metabolism; D012987:Soil; D012989:Soil Pollutants / Q000737:chemistry* / Q000378:metabolism; D013696:Temperature
D000538:Aluminum Silicates; D012987:Soil; D012989:Soil Pollutants; D011078:Polychlorinated Biphenyls; D000077215:Clay