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- W2062893297 abstract "Triazine herbicides are among the most widely used herbicides in the United States. Many triazine compounds are relatively stable under natural conditions and have become prominent contaminants in hydrologic systems. It was previously reported that chloro-s-triazine compounds were rapidly dechlorinated in water by polysulfides, and the reaction was assumed to be aromatic nucleophilic substitution (SNAr). In this study, we evaluated the effect of free radical inhibitors on the reaction rate of polysulfides with herbicides atrazine, simazine, and cyanazine. The reaction was significantly inhibited by radical scavengers oxygen and 1,4-benzoquinone, suggesting involvement of free radicals in the reaction. Spectral analysis of the reaction mixture using electron spin resonance showed that after the reaction, the free radical concentration in polysulfide solution substantially decreased. These evidences indicate that radical sulfur anions may also be involved in the reaction, likely via a free radical substitution reaction (SRN1) mechanism. Amendment of sodium tetrasulfide significantly reduced the leaching of atrazine or simazine from packed sand columns. Therefore, polysulfide salts may be potentially used to remove residues of triazine herbicides in environmental media. Keywords: Chloro-s-triazine herbicides; SRN1 reaction; polysulfides; dechlorination; remediation" @default.
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- W2062893297 date "2004-10-16" @default.
- W2062893297 modified "2023-09-26" @default.
- W2062893297 title "Nucleophilic Radical Substitution Reaction of Triazine Herbicides with Polysulfides" @default.
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- W2062893297 doi "https://doi.org/10.1021/jf049505p" @default.
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