Competitive sorption between 17α-ethinyl estradiol and bisphenol A/4-n-nonylphenol by soils |
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作者姓名: | Jianzhong Li Lu Jiang Xi Xiang Shuang Xu Rou Wen Xiang Liu |
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作者单位: | School of Environment, Tsinghua University, Beijing 100084, China;School of Environment, Tsinghua University, Beijing 100084, China;School of Environment, Tsinghua University, Beijing 100084, China;School of Environment, Tsinghua University, Beijing 100084, China;School of Environment, Tsinghua University, Beijing 100084, China;School of Environment, Tsinghua University, Beijing 100084, China |
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基金项目: | This work was supported by the Special Environmental Research Funds for Public Welfare (No. 201209053) and the National High Technology Research and Development Program (863) of China (No. 2008AA062502). |
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摘 要: | The sorption of 17α-ethinyl estradiol(EE2),bisphenol A(BPA),and 4-n-nonylphenol(NP) in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using three soils.Results showed that all sorption isotherms were nonlinear and fit the Freundlich model.The degree of nonlinearity was in the order BPA(0.537-0.686) > EE2(0.705-0.858) > NP(0.875-0.0.951) in single systems.The isotherm linearity index of EE2 sorption calculated by the Freundlich model for Loam,Silt Loam and Silt increased from 0.758,0.705 and 0.858,to 0.889,0.910 and 0.969,respectively,when BPA concentration increased from 0 to 1000 μg/L,but the effect of NP was comparably minimal.Additionally,EE2 significantly suppressed the sorption of BPA,but insignificantly suppressed that of NP.These findings can be attributed to the difference of sorption affinity of EE2,NP and BPA on the hard carbon(e.g.,black carbon) of soil organic matter that dominated the sorption in the low equilibrium aqueous concentration range of endocrine-disrupting chemicals(EDCs).Competitive sorption among EDCs presents new challenges for predicting the transport and fate of EDCs under the influence of co-solutes.
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关 键 词: | competitive sorption 17α-ethinyl estradiol endocrine-disrupting chemicals distributed reactivity model black carbon |
收稿时间: | 10 September 2012 |
修稿时间: | 30 October 2012 |
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