二氰蒽醌在贵州典型土壤中降解特征研究

为探明杀菌剂二氰蒽醌在施用后的环境风险，本文以贵州典型黄壤、水稻土、石灰土为研究对象，试验模拟3种土壤在好气和积水厌气条件下对二氰蒽醌的降解特征。结果表明，3种土壤对二氰蒽醌的降解符合一级动力学方程，好气条件下，二氰蒽醌在3种土壤中的降解半衰期分别为8．83cl,10．31d．8．52d积水厌气条件下半衰期分别为5．48c1．5．39c1．6．70d，均属于易降解级别。二氰蒽醌的环境不稳定性决定其不易造成环境持久性污染，属环境低风险物质。

Research of Degradation of Dithianon in Typical Soils in Guizhou Province

In order to research on the environmental risk of application of fungicide dithianon, three typical soils in Guizhou province were used to simulate degradation characteristics of yellow soil, paddy soil and limestone soil in laboratory under aerobic and anaerobic conditions. The results showed that the degradation of dithianon in three soils conformed to a kinetic equation. Under the aerobic conditions, the half - life of dithianon are 8.83 days in yellow soil, 10.31 days in paddy soil and 8.52 days in limestone soil, while the half - life are 5.48 days, 5.39 days and 6.70 days respectively under the anaerobic conditions, which suggests that the dithianon is belonging to the easily degradable substance in environment. Dithianon is difficult to cause persistent environmental pollution because of its instability. Therefore, dithianon is a low - risk substance in environment.