己唑醇在水溶液中的光化学降解研究

研究了高压汞灯光源下己唑醇在不同pH缓冲液中的光化学降解特性及NO3-和NO2-对光解的影响.结果表明,己唑醇在水溶液中的光解符合一级动力学规律.不同pH值缓冲溶液中的光解速率排序为:pH=7>pH=9>pH=5.在己唑醇水溶液中添加不同浓度的NO3-及NO2-,均会不同程度地影响己唑醇的光解速率.在0～20mg·L-1的浓度范围内,NO3-对己唑醇的光解均表现为促进作用,且随着添加浓度的增大促进作用增强;NO2-在0.4和2mg·L-1浓度下,对己唑醇的光解有一定的促进作用,而在10～20mg·L-1浓度时,表现为抑制作用.

Photochemical degradation of hexaconazole in aqueous solution

The photochemical degradation characteristics of hexaconazole in different pH buffer, NO₃^- and NO^-₂ were studied under high-pressure mercury lamps. The results showed that the photolysis degradation of hexaconazole accorded with the first order reaction kinetics. The photolytic rates of hexaconazole in different pH values showed the following sequence: pH=7>pH=9>pH=5. The rates was also influenced by the different concentrations of nitrate or nitrite in the hexaconazole aqueous solutions. In the concentration ranges of 0 to 20 mg·L^-1, the added concentrations of NO₃^- could increase the photolysis rates. The NO^-₂ could promote the photolysis rates at the concentrations of 0.4 and 2 mg·L^-1, but inhibit the processes at the concentrations of 10 to 20 mg·L^-1.