Comprehensive Screening Study of Pesticide Degradation via Oxidation and Hydrolysis

Abstract

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-mass spectrometry detection or gas chromatography-electron capture detection after liquid-liquid 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.

Department(s)

Chemistry

Second Department

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Agricultural Chemicals; Chemistry; Chlorine; Chlorine Dioxides; Comprehensive Studies; Degradation; Direct Injection; Drinking Water; Free Chlorine; Gas Chromatography; Hydrogen; Hydrogen Peroxide; Hydrogen-Ion Concentration; Hydrolysis; Kinetics; Lead Removal (Water Treatment); Liquid Chromatography; Liquid-liquid Extraction; Liquids; Mass Spectrometry; Monochloramine; Organophosphorous Pesticides; Oxidation; Oxidation Reduction Reaction; Oxidization; Ozone; Ozone Water Treatment; Ozonization; Pesticide; Pesticide Degradation; PH; Photodegradation; Potable Water; Pyrazoles; Solvent Extraction; Water Pollution Control

International Standard Serial Number (ISSN)

0021-8561

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jan 2012

Link to Full Text

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