五氟磺草胺的光解特性研究

Study on Photolytic Characters of Penoxsulam Photolysis

通过室内模拟的试验方法研究了五氟磺草胺在高压汞灯下的光解特性。五氟磺草胺在pH5、7、9的缓冲溶液中光解半衰期分别为23 min、20.6 min、18.7 min,随着pH的升高光解速率加快。在五氟磺草胺浓度为1 mg/kg、2 mg/kg、5 mg/kg的水溶液中半衰期分别为14.2 min、17.5 min、22.1 min,光解速率随着浓度的升高而减慢。在1 g/L、2 g/L的腐殖酸溶液中五氟磺草胺的半衰期分别为6.6 min、4.6 min,其光解速度是水中的4～5倍。五氟磺草胺在0.1 g/L的UV531溶液中半衰期为27.8 min,在0.2 g/L的溶液中半衰期为35.8 min,半衰期比在水溶液中延长60%。

The photolysis of penoxsulam was studied under the high pressure mercury lamp.The half-lives of penoxsulam in the buffer solutions with pH values of 5,7 and 9 were 23 min,20.6 min and 18.7 min,respectively.The photo-degradation rate raised with the increase of pH value.The half-lives were 14.2 min,17.5 min and 22.1 min in the water solutions with penoxsulam concentration of 1 mg /kg,2 mg /kg and 5 mg /kg,respectively.The photo-degradation rate decreased with the increase of pH value.The half-lives were 6.6 min and 4.6 min in humid acids with the concentration of 1 g /L and 2 g /L,respectively.The rate of photo-degradation was 4 ～ 5 times of hydrolysis.The half-lives were 27.8 min and 35.8 min in the solutions with UV531 concentrations of 0.1 g /L and 0.2 g /L,respectively.The half-lives extended 60% than in water without UV531.