Sorption of endocrine disrupting chemicals by condensed organic matter in soils and sediments.
Sorption of endocrine disrupting chemicals by condensed organic matter in soils and sediments.
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DOI：
10.1016/j.chemosphere.2010.05.028
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发表时间：
2010-08
期刊：
影响因子：
8.8
通讯作者：
Ke Sun;Bo Gao;Zheyun Zhang;Guixiang Zhang;Xitao Liu;Ye Zhao;B. Xing
中科院分区：
文献类型：
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作者：
Ke Sun;Bo Gao;Zheyun Zhang;Guixiang Zhang;Xitao Liu;Ye Zhao;B. Xing
研究了17α-乙炔基雌二醇（EE 2）和双酚A（BPA）在非水解碳（NHC）、黑碳（BC）、土壤和沉积物中的吸附。所有吸附等温线均为非线性，符合Freundlich和Dubininin-Ashtakhov（DA）模型。单点有机碳（OC）归一化分配系数（KOC）的EE 2为孤立的NHC和BC分别是2.7-4.8倍和5.4-12.9倍，比大样本。然而，没有观察到BPA KOC值的明显趋势。基于土壤/沉积物有机质（SOM）组分对BPA或EE 2的整体吸附的贡献，浓缩的SOM（NHC和BC）一般发挥了主导作用的整体吸附。在NHC上，由DA模型计算的BPA吸附量（QOC 0）高于EE 2，且EE 2和BPA的吸附等温线非线性系数（n）存在明显差异。这些结果表明，BPA可能比EE 2更容易进入NHC样品的孔隙部位。BPA与NHC或BC之间形成的π-π键可能比EE 2与NHC或BC之间形成的π-π键更强。这可能归因于BPA具有两个苯环的事实，并且也可以用于解释BPA和EE 2在排除疏水效应后的十六烷-水分配系数（KHW）-归一化的KOC值（KOC/KHW）的差异。这些发现可能有助于预测内分泌干扰物（EDCs）的命运和生态风险（例如，EE 2和BPA），特别是当土壤或沉积物成为EDCs的受体时。
Sorption of 17α-ethinyl estradiol (EE2) and bisphenol A (BPA) by nonhydrolyzable carbon (NHC), black carbon (BC), and bulk soils and sediments was examined. All sorption isotherms were nonlinear and fitted both Freundlich and Dubinin–Ashtakhov (DA) models. The single-point organic carbon (OC)-normalized distribution coefficient (KOC) of EE2 for the isolated NHC and BC was 2.7–4.8 times and 5.4–12.9 times greater, respectively, than that of the bulk samples. However, no clear trend in BPA KOCvalues was observed. Based on the contribution of soil/sediment organic matter (SOM) fractions to the overall sorption of BPA or EE2 by the bulk samples, condensed SOM (NHC and BC) generally played a dominant role to the overall sorption. The BPA adsorption capacity (QOC0) from the DA model was higher than that of EE2 on NHC and there was obvious difference in isotherm nonlinearity (n) between EE2 and BPA. These results suggest that BPA may have more access to the pore sites of NHC samples than EE2. The π–π bonds formed between BPA and NHC or BC may be stronger than that between EE2 and NHC or BC. This would be attributed to the fact that BPA has two benzene rings, and can also be used to explain the difference in hexadecane-water partition coefficient (KHW)-normalized KOCvalues (KOC/KHW) of BPA and EE2 after factoring out the hydrophobic effect. These findings could be useful for predicting fate and ecological risks of endocrine disrupting chemicals (EDCs) (e.g., EE2 and BPA) in natural environments especially when soils or sediments become receptors for EDCs.