Comprehensive Screening Study of Pesticide Degradation via Oxidation and Hydrolysis

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• 作者：Evelyn Chamberlain ; Honglan Shi ; Tongwen Wang ; Yinfa Ma ; Alice Fulmer ; Craig Adams
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：60
• 期：1
• 页码：354-363
• 全文大小：273K
• 年卷期：v.60,no.1(January 11, 2012)
• ISSN：1520-5118

文摘

This comprehensive study focused on the reactivity of a set of 62 pesticides via oxidization by free chlorine, monochloramine, chlorine dioxide, hydrogen peroxide, ozone, and permanganate; photodegradation with UV₂₅₄; and hydrolysis at pH 2, 7, and 12. Samples were analyzed using direct injection liquid chromatography鈥搈ass spectrometry detection or gas chromatography鈥揺lectron capture detection after liquid鈥搇iquid extraction. Many pesticides were reactive via hydrolysis and/or chlorination and ozonation mechanisms under typical drinking water treatment conditions, with less reactivity exhibited on average for chlorine dioxide, monochloramine, hydrogen peroxide, and UV₂₅₄. The pyrazole and organophosphorous pesticides were most reactive in general, whereas carbamates and others were less reactive. The screening study provides guidance for the pesticide/oxidation systems that are most likely to lead to degradates in water treatment and the environment.

Keywords:

pesticide degradation; oxidation; photodegradation; hydrolysis; drinking water