Effects of physical-chemical characteristics on the sorption of selected endocrine disrnptors by dissolved organic matter surrogates
Effects of physical-chemical characteristics on the sorption of selected endocrine disrnptors by dissolved organic matter surrogates
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DOI：
10.1021/es026405w
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发表时间：
2003-06-15
影响因子：
11.4
通讯作者：
Morita, M
中科院分区：
文献类型：
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作者：
Yamamoto, H;Liljestrand, HM;Morita, M
采用荧光猝灭法和溶解度增强法测定了所选内分泌干扰物对多种溶解性有机物（DOM）的吸附系数（K-oc值）。选取17 -雌二醇、雌三醇、17 -乙炔雌二醇、对壬基酚、对叔辛基酚和邻苯二甲酸二丁酯作为内分泌干扰物。选取Aldrich腐植酸、Suwannee River腐植酸和黄腐酸、北欧黄腐酸、褐藻酸、葡聚糖和单宁酸作为DOM替代物。所得的吸附系数（log K-oc）与所选内分泌干扰物的辛醇-水分配系数（log K-oc）无关，表明疏水相互作用不是主要的吸附机制。此外，所选内分泌干扰物的K-oc值，特别是甾类雌激素，与DOM的272 nm紫外吸收率（A(272)）和酚基浓度的相关性要好于DOM的H/O或(O+N)/C原子比。这表明吸附机制与pi电子与氢键的相互作用密切相关，即甾类雌激素的酚基与DOM之间的亲和作用对整体吸附贡献较大，且甾类雌激素的K-oc值与烷基酚和邻苯二甲酸二丁酯的K-oc值相当，以非特异性疏水相互作用为主。
Sorption coefficients (K-oc values) of selected endocrine disruptors for a wide variety of dissolved organic matter (DOM) were measured using fluorescence quenching and solubility enhancement. 17beta-Estradiol, estriol, 17alpha-ethynylestradiol, p-nonylphenol, p-tert-octylphenol, and dibutylphthalate were selected as endocrine disruptors. Aldrich humic acid, Suwannee River humic and fulvic acids, Nordic fulvic acid, alginic acid, dextran, and tannic acid were selected as DOM surrogates. The resulting sorption coefficients (log K-oc) were independent of octanolwater partitioning coefficients (log K-oc) of the selected endocrine disruptors, indicating the hydrophobic interaction is not the predominant sorption mechanism. Moreover, the K-oc values for the selected endocrine disruptors, especially the steroid estrogens, correlated much better with UV absorptivity at 272 nm (A(272)) and phenolic group concentration of the DOM than with either the H/O or the (O+N)/C atomic ratio of the DOM. This suggests that the sorption mechanism is closely related to the interaction between pi-electrons and the hydrogen bonds, i.e.,the affinity between phenolic groups of the steroid estrogens and DOM is suggested to provide a relatively large contribution to the overall sorption and yield the K-oc values of the steroid estrogens as high as those of the alkylphenols and dibutylphthalate, which are suggested to be dominated by nonspecific hydrophobic interaction.