| 腐霉利的光解及水解特性研究 |
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投稿时间：2018-01-14
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| 引用本文：侯丽娜,孟鸽,温勇,等.腐霉利的光解及水解特性研究[J].农药学学报,2018,20(3):340-347. |
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| 基金项目:国家重点研发计划项目（2016YFD0200207） |
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| 中文摘要:为研究腐霉利的消解特性，采用乙腈提取，弗罗里硅土柱净化，建立了油菜叶片中腐霉利残留的气相色谱-电子捕获检测器（GC-ECD）分析方法；并在室内模拟条件下，研究了腐霉利在油菜叶片表面的光解行为，以及不同初始浓度、不同pH值缓冲液、不同浓度Fe2+、Fe3+和NO3-、NO2-对水溶液中腐霉利光解的影响；通过气相色谱-电子轰击电离源质谱仪（GC-EIMS）鉴定了其在甲醇、丙酮和乙腈溶液中的光解产物；同时研究了不同pH值缓冲液和阴、阳离子表面活性剂对腐霉利水解特性的影响。结果表明：腐霉利添加水平为0.05、0.2、2及12 mg/kg时，其在油菜叶片中的平均回收率为80%~100%，相对标准偏差为2.3%~7.8%。腐霉利在油菜叶片表面的消解动态符合一级动力学方程，紫外灯下的消解半衰期为1.03 h。腐霉利在水溶液中的光解速率随其初始浓度的升高而减慢；其在酸性条件下稳定，碱性条件下易光解；NO3-、NO2-、Fe2+及Fe3+均可抑制腐霉利在水溶液中的光解，因此可用作为其光猝灭剂。共鉴定出两种腐霉利在甲醇、丙酮和乙腈溶液中的光解产物，分别为其单脱氯化产物C13H12ClNO2和其脱甲基化产物C12H9Cl2NO2。腐霉利在碱性条件下易水解，酸性条件下水解较慢；阴离子表面活性剂十二烷基磺酸钠（SDS）对其水解无影响，而阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）则可促进其水解。研究结果可为腐霉利的合理使用及其环境安全性评价提供参考。 |
| 中文关键词:腐霉利 残留 消解 油菜 光解 紫外光解 光解产物 水解 |
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| Study on the photolysis and hydrolysis characteristics of procymidone |
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| Abstract:In order to study the photolysis characteristics of procymidone, a gas chromatography with electronic capture detection (GC-ECD) method for the determination of procymidone residue on rape leaves was developed by extraction with acetonitrile and purification through florisil column. Under indoor simulation conditions, the photodegradation behavior of procymidone on rape leaves, and the effects of different initial concentration of procymidone, pH buffers, concentrations of NO3-, NO2-, Fe2+ and Fe3+ on the photodegradation of procymidone in aqueous solution were studied. The photolysis products of procymidone in methanol, acetone and acetonitrile were identified by gas chromatography-electron impact ionization mass spectrometry (GC-EIMS). Besides, the effects of different pH buffers, anionic and cationic surfactants on the hydrolysis of procymidone were investigated. The results showed that the recoveries of procymidone from rape leave samples at the spiked concentrations of 0.05, 0.2, 2 and 12 mg/kg were 80%-100% with the relative standard dissipation of 2.3%-7.8%. The dissipation dynamics of procymidone on the leaf surface of rape accorded with the first-order kinetic equation, and the dissipation half-life of procymidone under UV lamp was 1.03 h. The photodegradation rate of procymidone was decreased with the increase of the initial concentration. Procymidone was stable under acidic conditions, while it easily photolyzed under alkaline conditions. NO3-, NO2-, Fe2+ and Fe3+ inhibited the photodegradation of procymidone in aqueous solution. Therefore they were the photoquenching agents of procymidone. Two photolysis products of procymidone in methanol, acetone and acetonitrile were identified as monochlorination C13H12ClNO2 and demethylation C12H9Cl2NO2, respectively. The hydrolysis of procymidone was easier under alkaline conditions, but slowly under acidic conditions. The anionic surfactant sodium dodecyl sulfate (SDS) had no effect on the hydrolysis of procymidone. However, the cationic surfactant cetyl trimethyl ammonium bromide (CTAB) promoted the hydrolysis. This study provides a reference for the reasonable application and environmental safety evaluation of procymidone. |
| Key words:procymidone residue dissipation rape photolysis photolysis UV photolysis product hydrolysis |
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