腐殖质化学特性对一种氯化二噁英分配系数的影响
Influence of chemical characteristics of humic substances on the partition coefficient of a chlorinated dioxin.
作者信息
Tanaka Fumiko, Fukushima Masami, Kikuchi Atsunori, Yabuta Hikaru, Ichikawa Hiroyasu, Tatsumi Kenji
机构信息
National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba-West, Tsukuba, Ibaraki 305-8569, Japan.
出版信息
Chemosphere. 2005 Mar;58(10):1319-26. doi: 10.1016/j.chemosphere.2004.10.008.
The partition coefficients (Koc) of 1,2,3,4,6,7,8-heptachlorodibenzo-p-dioxin (HpCDD) with respect to a variety of humic substances (HSs) were evaluated by a method involving solid-phase microextraction and gas chromatography-electron capture detection. The log Koc values for each of the HS samples were in the range of 6.4-7.7. The log Koc values for HAs from tropical peat, brown forest and ando soils were in the range of 7.3-7.6, similar to the calculated value for the octanol-water partition coefficient (log Koc=7.56). In contrast, the log Koc values for FAs and peat HAs were 0.5-1 unit lower than the calculated value. The parameters for the polarity of HSs, as calculated from (N+O)/C, O/C atomic ratios and the carboxyl group content, were numerically similar related to the log Koc for HpCDD. These results show that the Koc values for HpCDD are significantly influenced by the polarity of HSs.
采用固相微萃取和气相色谱 - 电子捕获检测相结合的方法，评估了1,2,3,4,6,7,8 - 七氯二苯并 - p - 二噁英（HpCDD）在多种腐殖质（HSs）中的分配系数（Koc）。各HS样品的log Koc值在6.4 - 7.7范围内。来自热带泥炭、棕色森林土和暗色土的腐殖酸（HAs）的log Koc值在7.3 - 7.6范围内，与计算得到的正辛醇 - 水分配系数值（log Koc = 7.56）相似。相比之下，富里酸（FAs）和泥炭腐殖酸的log Koc值比计算值低0.5 - 1个单位。根据（N + O）/C、O/C原子比和羧基含量计算得到的HSs极性参数，在数值上与HpCDD的log Koc值相关。这些结果表明，HpCDD的Koc值受HSs极性的显著影响。
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