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首页> 外文期刊>Journal of Agricultural and Food Chemistry >PHOTOTRANSFORMATION OF CHLORIMURON-ETHYL IN AQUEOUS SOLUTION
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PHOTOTRANSFORMATION OF CHLORIMURON-ETHYL IN AQUEOUS SOLUTION

机译:氯乙基乙基酯在水溶液中的光转化

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Chlorimuron-ethyl is relatively stable in water buffered to pH 7.0 and 9.0, but hydrolyzes readily (half-life, 14 d) in water buffered to pH 4.0. In addition, chlorimuron-ethyl photodegrades rapidly and extensively in aqueous solution. The predominant photoproducts are 4-methoxy-6-chloro-2-aminopyrimidine, ethyl 2-aminosulfonylbenzoate, N-(4-methoxy-6-chloropyrimidin-2-yl)meth urea, and o-benzoic sulfimide (saccharin). A minor deesterified product (chlorimuron) was evident. The decrease in chlorimuron-ethyl concentration in aqueous solutions followed first-order kinetics. The rate of degradation in different types of water followed the order irrigation water > tap water > distilled water. Chlorimuron-ethyl photodegraded in pH 4, 7, and 9 buffer solutions under both UV and sunlight. A faster degradation rate in pH 4.0 buffer solution was observed.
机译:氯嘧磺隆在缓冲至pH 7.0和9.0的水中相对稳定,但在缓冲至pH 4.0的水中容易水解(半衰期为14 d)。此外,氯嘧磺隆在水溶液中迅速而广泛地光降解。主要的光产物是4-甲氧基-6-氯-2-氨基嘧啶,2-氨基磺酰基苯甲酸乙酯,N-(4-甲氧基-6-氯嘧啶-2-基)甲基尿素和邻苯甲酰亚胺(糖精)。明显有少量脱酯产物(氯嘧磺隆)。水溶液中氯嘧磺隆浓度的降低遵循一级动力学。不同类型的水中的降解率依次为灌溉水>自来水>蒸馏水。在pH 4、7和9的缓冲溶液中,在紫外线和阳光下,氯嘧磺隆都会被光降解。在pH 4.0缓冲溶液中观察到更快的降解速率。

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