土壤和水中啶氧菌酯的环境行为研究

通过对啶氧菌酯在三种典型土壤(潮土、褐土和红壤土)和水中挥发性、光降解和淋溶性的研究,明确了其环境行为。啶氧菌酯在三种土壤表面和水中,24 h吸收液中未检测到挥发的啶氧菌酯;啶氧菌酯在三种土壤表面的光降解半衰期分别为潮土26.70h、褐土32.80 h和红壤土12.80 h,在水中的光解半衰期为3.20 h;啶氧菌酯在三种土壤中的迁移率分别为潮土0.083、褐土0.08、红壤土0.25。结果表明:啶氧菌酯在三种土壤和水中均难挥发,在土壤表面难光降解,而在水表面较易光降解;在潮土和褐土中移动性等级为不移动,而在红壤中移动性等级为不易移动。综上认为,啶氧菌酯在三种土壤中稳定性高、迁移率低,长期高频次施容易导致土壤中啶氧菌酯累积,而在水中易于降解,不容易累积。

Environmental behaviors of picoxystrobin in soils and water

Picoxystrobin is mainly used in controlling diseases in grain crops. However, its environmental behaviors are still not well understood. Here we investigated leaching, photocatalytic degradation and volatilization of picoxystrobin using liquid extraction combined with high performance liquid chromatography(LE-HPLC) detection. There was no volatilization of picoxystrobin detected in water and three typical soils. The half-life of picoxystrobin in photocatalytic degradation were 26.70 h on the surface of fluvo-aquic soil, 32.80 h on cinnamon soil, 2.80 h on red soil, and 3.20 h in water. The migration of picoxystrobin was 0.083, 0.08, and 0.25 in fluvo-aquic soil, cinnamon soil, and red soil, respectively. These results demonstrate that picoxystrobin is stable and accumulates in soil with long-term and frequent applications, but is easily degraded in water.