title: Competitive sorption between 17alpha-ethinyl estradiol and bisphenol A/4-n-nonylphenol by soils.
abstract: The sorption of 17alpha-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 microg/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.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China. lijianzhong03@163.com
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Li
authors.forename: Lu
authors.initials: L
authors.lastname: Jiang
authors.forename: Xi
authors.initials: X
authors.lastname: Xiang
authors.forename: Shuang
authors.initials: S
authors.lastname: Xu
authors.forename: Rou
authors.initials: R
authors.lastname: Wen
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds / Q000737:chemistry*; D004997:Ethinyl Estradiol / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D004997:Ethinyl Estradiol; D010636:Phenols; D012987:Soil; C041594:4-nonylphenol; C006780:bisphenol A; D000098826:Bisphenol A Compounds