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

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• 作者：Tao Tang ; Tianyu Shi ; Deguang Li ; Jinming Xia ; Qiongbo Hu ; Yongsong Cao
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：April 25, 2012
• 年：2012
• 卷：60
• 期：16
• 页码：3999-4004
• 全文大小：247K
• 年卷期：v.60,no.16(April 25, 2012)
• ISSN：1520-5118

文摘

Levonorgestrel, 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 levonorgestrel, batch experiments and laboratory microcosm studies were conducted to investigate the adsorption and degradation of levonorgestrel in five contrasting soils of China. Freundlich and Langmuir models were applied to sorption data to examine the affinity of levonorgestrel for soils with varying physical and chemical properties. The K_f of levonorgestrel in the tested soils ranged from 10.79 to 60.92 mg^1鈥?i>n Lⁿ kg^鈥? 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 levonorgestrel sorption on soils could be considered as a physical adsorption. The degradation of levonorgestrel in five soils was fitted by the first-order reaction kinetics model. The half-lives of levonorgestrel were between 4.32 and 11.55 days. The initial concentration and sterilization experiments illustrated that the degradation rate of levonorgestrel in soil was concentration-dependent and microbially mediated. The low mobility potential of levonorgestrel in soils was predicted by the groundwater ubiquity score (GUS) and retardation factor (R_f).

Keywords:

Levonorgestrel; adsorption; degradation; soil