Chlorination of parabens: reaction kinetics and transformation product identification

文献类型： 外文期刊

第一作者： Mao, Qianhui

作者： Mao, Qianhui;Wang, Wei;Hu, Zhenhu;Yuan, Shoujun;Ji, Feng;Wang, Qiquan;Yuan, Shoujun

作者机构：

关键词： Parabens;Chlorination;Kinetics;Transformation products;Pathway;Mechanism

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2016 年 23 卷 22 期

页码：

收录情况： SCI

摘要： The reactivity and fate of parabens during chlorination were investigated in this work. Chlorination kinetics of methylparaben (MeP), ethylparaben (EtP), propylparaben (PrP), and butylparaben (BuP) were studied in the pH range of 4.0 to 11.0 at 25 +/- A 1 A degrees C. Apparent rate constants (k (app)) of 9.65 x 10(-3) M-0.614 center dot s(-1), 1.77 x 10(-2) M-1.019 center dot s(-1), 2.98 x 10(-2) M-0.851 center dot s(-1), and 1.76 x 10(-2) M-0.860 center dot s(-1) for MeP, EtP, PrP, and BuP, respectively, were obtained at pH 7.0. The rate constants depended on the solution pH, temperature, and NH4 (+) concentration. The maximum k (app) was obtained at pH 8.0, and the minimum value was obtained at pH 11.0. The reaction rate constants increased with increasing temperature. When NH4 (+) was added to the solution, the reaction of parabens was inhibited due to the rapid formation of chloramines. Two main transformation products, 3-chloro-parabens and 3,5-dichloro-parabens, were identified by GC-MS and LCMS-IT-TOF, and a reaction pathway was proposed. Dichlorinated parabens accumulated in solution, which is a threat to human health and the aqueous environment.

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