Degradation of the strobilurin fungicide mandestrobin in illuminated water–sediment systems

IF 1.5 4区 农林科学 Q2 ENTOMOLOGY
Takeshi Adachi, Yusuke Suzuki, Takuo Fujisawa
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引用次数: 0

Abstract

The degradation behavior of mandestrobin (1) was investigated in aerobic aquatic water–sediment systems exposed to continuous artificial sunlight (λ>290 nm). [14C]mandestrobin uniformly labeled at the phenoxy or benzyl ring was individually applied to the overlying water of the system at a rate equivalent to 262.5 g a.i./ha. The transformation of 1 was mainly proceeded via photoinduced bond cleavage at the benzyl phenyl ether and the subsequent rearrangement reaction. Interestingly, some of the photodegradates and microbial metabolites of 1 observed in the aquatic photodegradation and water–sediment (dark) studies, respectively, were never detected. Furthermore, the observed photoproducts were less formed and were steadily degraded or metabolized to carbon dioxide or strongly adsorbed to bottom sediment. The fate of 1 and its degradates in illuminated water–sediment systems was considered to reflect realistic conditions more precisely, as it accounts for various effects attributed to sunlight.

Abstract Image Fullsize Image
strobilurin杀菌剂曼陀罗菌素在光照水-沉积物系统中的降解作用
研究了在连续人工日光(λ>290 nm)照射下的好氧水生水-沉积物系统中曼陀罗菌素(1)的降解行为。将苯氧基环或苄基环上均匀标记的[14C]曼陀罗菌素以相当于 262.5 克活性成分/公顷的剂量分别施入该系统的上层水中。1 的转化主要是通过苄基苯基醚上的光诱导键裂解和随后的重排反应进行的。有趣的是,在水生光降解和水-沉积物(暗)研究中分别观察到的 1 的一些光降解物和微生物代谢物从未被检测到。此外,观察到的光降解产物形成较少,它们被稳定降解或代谢为二氧化碳,或被强烈吸附到底泥中。1 及其降解物在光照下的水-沉积物系统中的命运被认为更准确地反映了现实条件,因为它考虑到了归因于阳光的各种影响。
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来源期刊
Journal of Pesticide Science
Journal of Pesticide Science 农林科学-昆虫学
CiteScore
4.30
自引率
4.20%
发文量
28
审稿时长
18-36 weeks
期刊介绍: The Journal of Pesticide Science publishes the results of original research regarding the chemistry and biochemistry of pesticides including bio-based materials. It also covers their metabolism, toxicology, environmental fate and formulation.
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