乙烯菌核利在水溶液中的光解动力学

以高压汞灯和太阳光为光源,研究乙烯菌核利在重蒸水、自来水、湖水及pH缓冲液中的光解动力学。高压汞灯下,乙烯菌核利在重蒸水中的光解半衰期约为28 m in,而在太阳光下为3.86 h。自来水和湖水中溶解性物质对乙烯菌核利在高压汞灯下的光解动力学仅有微弱的淬灭效应,但在太阳光下表现出显著的敏化效应,照光3 h的敏化效率分别为138%和126%。2种光源下,pH 5.0和pH 7.0缓冲液对乙烯菌核利的光解均表现为光淬灭效应,高压汞灯照光60 m in的淬灭效率分别为69%和57%,太阳光照光7 h的淬灭效率分别为77%和33%;pH 9.0缓冲液则表现出显著的敏化效应,高压汞灯照光20 m in的敏化效率为58%,而太阳光照光1 h的敏化效率则达到了415%。

Photolystic kinetics of vinclozolin in aqueous solutions

Photolystic kinetics of vinclozolin in various aqueous solutions under a high pressure mercury lamp and the sunlight were studied.The half-life of vinclozolin photolysis in redistilled water was 28 min and 3.86 h under a high pressure mercury lamp and the sunlight,respectively.Soluble substances in tap water and lake water showed faint influence on photodegradation of vinclozolin under the high pressure mercury lamp,but significant sensitizing effect under the sunlight,bringing the photosensitizing rate up to 138% and 126% in 3 h,respectively.Under either light sources,both buffers,pH 5.0 and pH 7.0,showed an obvious photoquenching effect on vinclozolin,but buffer pH 9.0 showed a strong photosensitizing effect,especially under the sunlight.The photoquenching rates of the buffers,pH 5.0 and pH 7.0,against vinclozolin were 69% and 57% under the high pressure mercury lamp for 60 min,respectively and 77% and 33% under the sunlight for 7 h,respectively.The photosensitizing rate of buffer pH 9.0 was 58% and 415% under the high pressure mercury lamp for 20 min and under the sunlight for 1 h,respectively.