关键词: 三唑类, 降解, 氟环唑, 戊唑醇, 粉唑醇

Abstract:

The knowledge of behaviors and fates of 1,2,4-triazole-typed fungicides in the environment is critical to assessing their environmental risks. An in-laboratory experiment was performed to examine influences of temperature, pH and light on degradation of three kinds of 1,2,4-triazole fungicides(epoxiconazole, tebuconazole, and flutriafol)in water and soil. Results show that the photolysis half-life of epoxiconazole, tebuconazole, and flutriafol was 0.68, 2.35 and 9.30 h, respectively. Epoxiconazole and tebuconazole were readily photolyzed pesticides, while flutriafol was medium in readiness. In water with pH being 4.0, 7.0 and 9.0 under 25 ℃,the hydrolysis half-life was 120, 131 and 151 d, respectively, for epoxiconazole,and 257, 198 and 187 d for tebuconazole and 204, 182 and 182 d for flutriafol. Hydrolysis of the three types of fungicides was closely related to water pH and their chemical structure. The half-lives of epoxiconazole, tebuconazole, and flutriafol were 58.2 to 72.9 days in the red soil of Jiangxi, 182 to 365 days in the paddy soil of Taihu Region and 102 to 161 days in the black soil of Northeast China. The findings of the experiment indicate that epoxiconazole, tebuconazole, and flutriafol all have a long residual period in water and soil, which calls for more attention to their pollution of the environment and monitoring of their application and residues in the environment.

Key words: 1,2,4-triazole, degradation, epoxiconazole, tebuconazole, flutriafol