内分泌干扰物双酚A和己烯雌酚在电化学处理和氯化过程中的反应比较研究。

Comparative study of reactions of endocrine disruptors bisphenol A and diethylstilbestrol in electrochemical treatment and chlorination.

作者信息

Korshin Gregory V, Kim Jaeshin, Gan Lili

机构信息

Department of Civil and Environmental Engineering, University of Washington, Box 352700, Seattle, WA 98115-2700, USA.

出版信息

Water Res. 2006 Mar;40(5):1070-8. doi: 10.1016/j.watres.2006.01.003.

DOI:10.1016/j.watres.2006.01.003

PMID:16476465

Abstract

Transformations of diethylstilbestrol (DES) and bisphenol A (BPA) in conventional chlorination and electrochemically (EC) treated solutions were examined using spectrophotometry and chromatographic analyses. EC treatment was carried out using an undivided EC cell with a PbO2 anode and a stainless steel cathode. EC-treatment and conventional chlorination caused DES and BPA to undergo a rapid degradation accompanied by the generation of low molecular weight chlorinated organic species indicative of the breakdown of DES and BPA. The identified compounds were predominated by chloroacetic acids (HAAs), but approximately 80% of the total organic halogen (TOX) was comprised by unidentified species. For EC treatment, the HAA yields were lower and HAAs were predominated by monochloroacetic acid (MCAA), while in the case of conventional chlorination, trichloroacetic acid (TCAA) was predominant and MCAA was virtually absent. The changes in the HAA speciation and yields were concluded to be caused by the EC-driven reductive dehalogenation which, however, did not affect the unidentified fraction of TOX. This indicated that the unidentified part of TOX was comprised by aromatic chlorinated forms of BPA and DES. Their resistance to degradation in EC reactors indicates that these compounds may be stable in conditions typical for drinking water treatment and distribution.

摘要

使用分光光度法和色谱分析研究了己烯雌酚（DES）和双酚A（BPA）在常规氯化处理和电化学（EC）处理溶液中的转化情况。EC处理是在一个无隔膜的EC电解槽中进行的，阳极是PbO₂，阴极是不锈钢。EC处理和常规氯化处理导致DES和BPA迅速降解，同时产生低分子量的氯化有机物种，这表明DES和BPA发生了分解。鉴定出的化合物以氯乙酸（HAAs）为主，但总有机卤（TOX）中约80%由未鉴定的物种组成。对于EC处理，HAA的产率较低，且HAA以一氯乙酸（MCAA）为主；而在常规氯化处理的情况下，三氯乙酸（TCAA）占主导，几乎没有MCAA。得出结论，HAA形态和产率的变化是由EC驱动的还原脱卤作用引起的，然而，这并没有影响TOX中未鉴定的部分。这表明TOX中未鉴定的部分由BPA和DES的芳香族氯化形式组成。它们在EC反应器中抗降解的特性表明，这些化合物在饮用水处理和分配的典型条件下可能是稳定的。