三唑醇及其对映异构体在3种不同类型土壤中的降解动态

鹿文红; 王继红; 张春荣; 何红梅; 张昌朋; 赵华; 平立凤

doi:10.3969/j.issn.1008-7303.2014.05.11

三唑醇及其对映异构体在3种不同类型土壤中的降解动态

Degradation dynamics of triadimenol and its enantiomersin three different types of soil

摘要

摘要: 实验室条件下，初步研究了手性农药三唑醇及其非对映异构体三唑醇A（对映异构体1R，2S 体和1S，2R体的混合物）与三唑醇B（对映异构体1R，2R体和1S，2S体的混合物）在浙江杭州潮土（有机质含量1.90%，pH 6.85）、金华水稻土（有机质含量1.63%，pH 4.94）和兰溪红土（有机质含量0.38%，pH 4.03）中的降解动态及对映体之间相互转化的情况。结果表明：三唑醇在潮土、水稻土和红土中的降解半衰期分别为56.4、105.0和154.0 d，180 d时降解率分别为91.9%、79.2%和57.7%；三唑醇在潮土中发生两次三唑醇A体向B体转化和1次三唑醇B体向A体的转化，而在水稻土和红土中，三唑醇A体与B体之间相互各转化1次。表明三唑醇对映异构体的降解动态因土壤性质不同而存在差异。研究结果为三唑醇的科学合理使用及其环境风险评估提供参考。

Abstract: The degradation dynamics of triadimenol and its enantiomers in fluvo-aquic soil(organic substances content is 1.90%, pH 6.85)from Hangzhou city in Zhejiang Province, paddy soil(organic substances content is 1.63%, pH 4.94) from Jinhua city and red soil(organic substances content is 0.38%, pH 4.03) from Lanxi city under laboratory conditions were investigated. The results showed that half-lives of triadimenol were 56.4, 105.0 and 154.0 days in fluvo-aquic soil, paddy soil and red soil, respectively. The degradation rate of triadimenol at 180 days were 91.9%,79.2% and 57.7%, respectively. Triadimenol-A transformed to triadimenol-B twice and triadimenol-B transformed to triadimenol-A once in fluvo-aquic soil.Triadimenol-A transformed to triadimenol-B once and triadimenol-B transformed to triadimenol-A once in paddy soil and red soil. In conclusion, triadimenol enantiomers' degradation dynamics varied in different soils.

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