除草剂异草氟唑及其产物在环中性pH下的反旋水解和光解。

IF 11.3 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Kun-Pu Ho, Jacqueline Rogers, Ying Yu and Kimberly M. Parker*, 
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引用次数: 0

摘要

原除草剂异草氟唑及其水解产物二酮腈是地表水中令人关注的新兴污染物,它们对人类健康和非目标植被都构成威胁。关于它们在环中性pH下通过非生物水解和光解转化的信息有限,这两个过程都是影响这些污染物命运的关键过程。在这里,我们报告了异草氟唑在pH为7时水解成二酮腈,半衰期为19 d,比先前的模型所建议的慢23倍。校正水解后,发现异草氟唑在模拟阳光下光解,量子产率为(1.56±0.12)× 10-3,对应于在夏季30°N晴空辐照下预测的近表面半衰期为12 d,比之前预测的慢2倍。不水解的二酮腈,尽管在太阳光谱内具有显著的吸光度,但仍进行了缓慢的光解,在相同条件下的量子产率为(9.65±1.54)× 10-6,模拟半衰期为150 d。异草flulutole光解主要产生除二酮腈以外的产物,其中一些产物也容易水解。我们修订的环境半衰期表明,异草氟唑光解相对于水解可能比先前建模中考虑的更重要,尽管这两个过程最终都比先前报道的慢。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Deconvoluting Hydrolysis and Photolysis of the Herbicide Isoxaflutole and Its Products at Circumneutral pH

Deconvoluting Hydrolysis and Photolysis of the Herbicide Isoxaflutole and Its Products at Circumneutral pH

The proherbicide isoxaflutole and its hydrolysis product diketonitrile are emerging contaminants of concern in surface water, where they both pose risks to human health and nontarget vegetation. Limited information is available regarding their transformation via abiotic hydrolysis and photolysis at circumneutral pH, which are both key processes impacting the fate of these contaminants. Herein, we report that isoxaflutole hydrolyzes to diketonitrile with a half-life of 19 d at pH 7, which is 23-fold slower than prior modeling suggested. After correcting for hydrolysis, isoxaflutole was found to photolyze under simulated sunlight with a quantum yield of (1.56 ± 0.12) × 10–3, corresponding to a predicted near-surface half-life of 12 d under clear sky irradiance at 30 °N in summer, which was 2-fold slower than previously suggested. Diketonitrile, which does not hydrolyze, underwent slow photolysis despite significant absorbance within the solar spectrum, resulting in a quantum yield of (9.65 ± 1.54) × 10–6 and a modeled half-life of 150 d under the same conditions. Isoxaflutole photolysis primarily generated products other than diketonitrile, some of which were also susceptible to hydrolysis. Our revised environmental half-lives indicate that isoxaflutole photolysis is potentially more important relative to hydrolysis than considered in prior modeling, although both processes are ultimately slower than previously reported.

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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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