title: [Sorption and desorption of 17alpha-ethinyl estradiol and 4-n-nonylphenol in soil].
abstract: The sorption kinetics and sorption/desorption isotherms of two endocrine disrupting chemicals (EDCs) including 17alpha-ethinyl estradiol (EE2) and 4-n-nonylphenol (NP) on three natural soils with different physicochemical properties were investigated. Results showed that two-compartment first-order model performed better than one-compartment first-order model in description of EDCs' kinetic sorption. The fast sorption compartment was dominant in the initial stage, and then contribution from slow sorption compartment increased gradually with time until equilibrium. The adsorption rate of EE2 was 2.0-4.7 times as that of NP. For adsorption isotherms, both Freundlich and Dubinin-Ashtakhov (DA) models provided good fit, though DA model was more appropriate. The saturated sorption capacity (Q0) was in a positive correlation to the content of soil organic matter, and higher Q0 was found for NP (10.47-110.15 microg x g(-1)) than EE2 (0.85-7.67 microg x g(-1)). The calculated free energy of sorption indicated that physical process dominated sorption of EE2 and NP in soil. The desorption hysteresis occurred in sorption/desorption experiments of EE2 and NP, especially in soils with the high organic matter fraction and large specific surface, indicating EDCs' potential environmental risk in soil.
authors: School of Environment, Tsinghua University, Beijing 100084, China. jianglu52516@163.com
authors: Lu
authors: L
authors: Jiang
authors: Ji-Hua
authors: JH
authors: Wang
authors: Jian-Zhong
authors: JZ
authors: Li
authors: Jia
authors: J
authors: Xin
authors: Miao
authors: M
authors: Li
authors: Xiang
authors: X
authors: Liu
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D052244:Endocrine Disruptors / Q000302:isolation & purification; D004997:Ethinyl Estradiol / Q000302:isolation & purification*; D007700:Kinetics; D010636:Phenols / Q000302:isolation & purification*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000302:isolation & purification*
chemical_list: D052244:Endocrine Disruptors; D010636:Phenols; D012987:Soil; D012989:Soil Pollutants; D004997:Ethinyl Estradiol; C041594:4-nonylphenol