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作 者:钟言茹 孔令茹 来祺 王鸣华[1] 施海燕[1] ZHONG Yanru;KONG Lingru;LAI Qi;WANG Minghua;SHI Haiyan(College of Plant Protection,Nanjing Agricultural University,Nanjing 210095,China)
出 处:《农药学学报》2022年第6期1493-1499,共7页Chinese Journal of Pesticide Science
基 金:国家重点研发计划项目(2016YFD0200207).
摘 要:3,5-二氯苯胺(3,5-DCA)是二甲酰亚胺类杀菌剂(DCFs)在环境和植物中的主要降解代谢产物,比其母体化合物具有更强的毒性和持久性。本研究通过室内模拟试验,利用气相色谱-质谱联用仪(GC-MS)和高效液相色谱(HPLC),研究了3,5-DCA的光解和水解特性。结果表明:初始质量浓度为5 mg/L的3,5-DCA在氙灯和紫外灯下光解的半衰期分别为49.5和11.6 min;在中性、酸性和碱性条件下光解的半衰期分别为9.9、168和10.7 min;在甲醇、乙腈、正己烷中光解的半衰期分别为4.10、2.69和0.58 h。进一步研究发现,3,5-DCA在正己烷中的光解产物为单脱氯产物。3,5-DCA在中性、酸性和碱性条件下的水解半衰期分别为40.8、77.0和86.6 d。不同浓度的表面活性剂十二烷基磺酸钠(SDS)和十六烷基三甲基溴化铵(CTAB)溶液均可抑制3,5-DCA的水解,其中CTAB的抑制效果强于SDS。研究结果有助于更全面地了解二甲酰亚胺类杀菌剂的环境归趋,可为其合理使用及环境安全性评价提供数据支持。3,5-Dichloroaniline(3,5-DCA)is the main metabolite of dicarboximides fungicides(DCFs)in the environment and plants,and it is more toxic and persistent than the parent compounds.In this paper,the photolysis and hydrolysis of 3,5-DCA was studied in laboratory by using gas chromatography-mass spectrometry(GC-MS)and high performance liquid chromatography(HPLC).The results showed that at the initial concentration of 5 mg/L,the photolysis half-lives of 3,5-DCA were 49.5 min and 11.6 min,respectively,under xenon lamp and UV lamp,and were 9.9 min,168 min and 10.7 min under neutral,acidic and alkaline conditions.The half-lives were 4.10 h,2.69 h and 0.58 h in methanol,acetonitrile and n-hexane,respectively.Further study found that the photolysis product of 3,5-DCA in n-hexane is mono-dechlorination product.The hydrolysis half-lives of 3,5-DCA at the initial concentration of 5 mg/L were 40.8 days in neutral,77.0 days in acid and 86.6 days in alkaline solutions.Different concentrations of surfactant sodium dodecyl sulfonate(SDS)and cetyl trimethyl ammonium bromide(CTAB)solution inhibited the hydrolysis of 3,5-DCA,and the inhibition effect of CTAB was stronger than that of SDS.The results are helpful to understand the environmental fate of DCFs more comprehensively and provide data support for their rational use and environmental safety evaluation.
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