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

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。

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

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.