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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Fate and Stereoselective Behavior of Benalaxyl in a Water-Sediment Microcosm
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Fate and Stereoselective Behavior of Benalaxyl in a Water-Sediment Microcosm

机译：水沉积微观世界中贝那克星的命运和立体选择行为

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摘要

The environmental behavior and stereoselectivity of the chiral fungicide benalaxyl and its chiral metabolite benalaxyl acid in water, sediment, and water-sediment microcosms were studied. The microcosms were incubated at 25 degrees C with light or under darkness. The influencing factors such as light and microorganism were investigated. The results showed that benalaxyl had half-lives of >21 days in the microcosm system and that the metabolite benalaxyl acid could exist in the microcosm for >70 days. Benalaxyl was mainly transformed through microbial degradation, and thus sediment microorganisms played a major role in the dissipation of benalaxyl in the aquatic microcosm. The stereoselective behavior of benalaxyl and benalaxyl acid was also investigated. (-)-Benalaxyl was preferentially degraded in the microcosm, resulting in an enrichment of the more toxic enantiomer (+)-benalaxyl, which may cause higher risk to the aquatic system. Moreover, (-)-benalaxyl acid was preferentially formed in the microcosm. The enantioselectivity of the enantiomers in the microcosm should be taken into consideration for an accurate risk assessment.
机译：研究了水，沉积物和水沉淀微观世界中手性杀菌剂苯那克及其手性代谢产物苯那酸的环境行为和立体选择性。在25℃下在光照下或在黑暗中孵育微观世界。研究了影响因素，如光和微生物。结果表明，苯氧那唑在缩微系统中的半衰期大于21天，代谢产物苯那酸在缩微中可能存在> 70天。 Benalaxyl主要通过微生物降解而转化，因此沉积微生物在水生微观世界中对Benalaxyl的消散中起主要作用。还研究了苯那拉酸和苯那拉酸的立体选择性行为。 （-）-苯那拉基在缩影中被优先降解，从而导致毒性更强的对映异构体（+）-贝那拉基的富集，这可能对水生系统造成更高的风险。此外，在缩影中优先形成了（-）-苯甲醛。为了准确进行风险评估，应考虑缩影中对映体的对映选择性。

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