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Photodegradation of quinestrol in waters and the transformation products by UV irradiation

文献类型： 外文期刊

作者： Tang, Tao 1 ; Qian, Kun 1 ; Shi, Tianyu 1 ; Wang, Fang 1 ; Li, Pingliang 1 ; Li, Jianqiang 1 ; Cao, Yongsong 1 ;

作者机构： 1.China Agr Univ, Coll Agr & Biotechnol, Beijing 100093, Peoples R China

2.Zhejiang Acad Agr Sci, State Key Lab Breeding Base Zhejiang Sustainable, Inst Qual & Stand Agroprod, Minist Agr MOA,Key Lab Pesticide Residue Detect, Hangzhou 310021, Zhejiang, Peoples R China

关键词： quinestrol;photodegradation;transformation products;degradation pathways

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

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收录情况： SCI

摘要： Quinestrol is synthetic estrogen used in contraceptive and hormone replacement therapy and occasionally for treating breast cancer and prostate cancer. It can make its way into the environment through sewage discharge and waste disposal produced by human excretions. In this study, the photodegradation kinetics of quinestrol in various conditions was investigated by UV and solar irradiation. The affecting factors were studied including concentration of hydrogen peroxide, different water types, and the initial concentrations of quinestrol. Concurrently, the transformation products and presumed pathways of quinestrol in distilled water by UV irradiation were identified and proposed. The results showed that the degradation of quinestrol in both irradiation conditions followed the pseudo-first-order kinetics. More rapid degradation was observed by UV irradiation (k = 0.018 min~(-1)) than solar irradiation (k = 0.004 h~(-1)), and the photodegradation rate of quinestrol depended on the concentration of hydrogen peroxide, the initial concentration of quinestrol and water types. The transformation products of quinestrol in distilled water were identified by gas chromatography/mass spectrometry. When exposed to UV irradiation, quinestrol in aqueous solution was rapidly degraded, giving at least ten photodegradation products. The chemical structures of ten degradation products were identified on the basis of mass spectrum interpretation and literature data.

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