Adsorption Properties and Degradation Dynamics of Endocrine-Disrupting Chemical Levonorgestrel in Soils

文献类型： 外文期刊

第一作者： Xia, Jinming

作者： Xia, Jinming;Hu, Qiongbo;Tang, Tao;Shi, Tianyu;Li, Deguang;Cao, Yongsong;Tang, Tao

作者机构：

关键词： Levonorgestrei adsorption;degradation;soil

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

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收录情况： SCI

摘要： Levonorgestrei, a synthetic progesterone used as an oral contraceptive or emergency contraceptive pill, has been shown to be an endocrine-disrupting chemical. To assess the environmental risk of levonorgestrei, batch experiments and laboratory microcosm studies were conducted to investigate the adsorption and degradation of levonorgestrei in five contrasting soils of China. Freundlich and Langmuir models were applied to sorption data to examine the affinity of levonorgestrei for soils with varying physical and chemical properties. The K_f of levonorgestrei in the tested soils ranged from 10.79 to 60.92 mg~(1-n) L~n kg~(-1) with N between 0.69 and 1.23, and the Q_m, ranged from 18.18 to 196.08 mg/kg. The multiple regression analysis was conducted between K_f and soil properties. Results indicate that total organic carbon plays a dominant role.in the adsorption process. Gibbs free energy values less than 40 kJ/mol demonstrate that levonorgestrei sorption on soils could be considered as a physical adsorption. The degradation of levonorgestrei in five soils was fitted by the first-order reaction kinetics model. The half-lives of levonorgestrei were between 4.32 and 11.55 days. The initial concentration and sterilization experiments illustrated that the degradation rate of levonorgestrei in soil was concentration-dependent and microbially mediated. The low mobility potential of levonorgestrei in soils was predicted by the groundwater ubiquity score (GUS) and retardation factor (Rf).

分类号： R15

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