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Temperature-dependence of soil/air partition coefficient for polychlorinated biphenyls at subzero temperatures

机译：零以下温度下多氯联苯的土壤/空气分配系数的温度依赖性

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摘要

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 ℃). Measured K_(SA)-values ranged over 6.4 orders of magnitude, with log K_(SA) from 4.3 for PCBs 10/4 at +30 ℃ to 10.7 for PCBs 77/110 at -30 ℃. Higher than expected, K_(SA)-values were observed at subzero temperatures (by up to one order of magnitude, at -30 ℃). The plots of log K_(SA) vs. reciprocal absolute temperature show a change in slope at 0 ℃. 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.
机译：土壤/空气分配系数（K_（SA））是在多种环境相关温度（-30至+30℃）上通过掺有多氯联苯（PCB）的粉质粘土壤土上实验测量的。测量的K_（SA）值范围超过6.4个数量级，log K_（SA）从+30℃的PCB 10/4的4.3到-30℃的PCB 77/110的10.7的log。在低于零的温度下（在-30℃时，高达一个数量级）观察到K_（SA）值高于预期。 log K_（SA）与绝对温度倒数的关系图显示了0℃时斜率的变化。 K_（SA）与辛醇/空气分配系数（K_（OA））的对数对数线性回归的斜率接近1，表明K_（OA）是K_（SA）中化学间变异性的良好描述。进一步的研究表明，基于K_（OA）的Karickhoff型方程可以完全拟合实验K_（SA）值。

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  • 来源
    《Chemosphere》 |2009年第10期|1427-1433|共7页
  • 作者

    Xin He; Shuo Chen; Xie Quan; Zhenyu Liu; Yazhi Zhao;

  • 作者单位

    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;

    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;

    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;

    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;

    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;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    soil/air partition coefficient; subzero temperatures; PCBs; environmental fate;

    机译：土壤/空气分配系数;零下温度;PCB;环境命运;

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