Lyon B F, Ambrose R, Rice G, Maxwell C J
Martin-Marietta Energy Systems, Oak Ridge National Laboratory, TN, USA.
Chemosphere. 1997 Aug;35(4):791-808. doi: 10.1016/s0045-6535(97)00200-2.
To accurately model mercury transport to water bodies, an assessment of this pollutant's behavior in the watershed is critical. Partition coefficients, defined as an estimate of the ratio of the pollutant concentration sorbed onto soil/sediment particles to the pollutant concentration dissolved in pore water at equilibrium, is an important term in multimedia models. In this paper, partition coefficients are calculated for two broad species of mercury: inorganic mercuric mercury (Hg-II) and methylmercury (MHg). Although there is considerable variability in the calculated values, the approximate mean values for the soil-water partition coefficients range from 3.3 x 10(3) to 6.0 x 10(4) L/kg for Hg-II and 2.0 x 10(1) to 6.7 x 10(3) L/kg for MHg. For the benthic sediment partition coefficients, the values range from 5.7 x 10(3) to 9.9 x 10(5) L/kg for Hg-II, and 6.5 x 10(2) to 1.1 x 10(5) L/kg for MHg.
为了准确模拟汞向水体的迁移，评估这种污染物在流域中的行为至关重要。分配系数定义为平衡时吸附在土壤/沉积物颗粒上的污染物浓度与溶解在孔隙水中的污染物浓度之比的估计值，是多介质模型中的一个重要参数。在本文中，计算了两种主要汞物种的分配系数：无机汞（Hg-II）和甲基汞（MHg）。尽管计算值存在相当大的变异性，但Hg-II的土壤-水分配系数近似平均值范围为3.3×10³至6.0×10⁴L/kg，MHg的范围为2.0×10¹至6.7×10³L/kg。对于底栖沉积物分配系数，Hg-II的值范围为5.7×10³至9.9×10⁵L/kg，MHg的范围为6.5×10²至1.1×10⁵L/kg。
