农药学学报
農藥學學報
농약학학보
CHINESE JOURNAL OF PESTICIDE SCIENCE
2014年
4期
439-444
,共6页
嘧菌酯%光化学降解%光敏化作用%光淬灭作用
嘧菌酯%光化學降解%光敏化作用%光淬滅作用
밀균지%광화학강해%광민화작용%광쉬멸작용
azoxystrobin%photochemical degradation%photosensitizing effect%photoquenching effect
以500 W氙灯为光源，研究了嘧菌酯在水和有机溶剂中的光化学降解动态及其影响因素。结果表明：当质量浓度为5 mg/L时，嘧菌酯在纯水中光解的半衰期为5?8 h，在2～20 mg/L范围内，其光解速率随初始质量浓度的增大而降低；嘧菌酯在不同介质中的光解速率从大到小依次为乙腈＞水＞甲醇＞正己烷＞丙酮，其半衰期分别为4?8、5?8、11?5、12?1和23?5 h；硝酸盐对嘧菌酯在水中的光解具有光敏化作用，当NO3-质量浓度为1、2、10和20 mg/L 时，其半衰期分别为5?5、5?1、4?5和3?9 h；在1～2 mg/L质量浓度下，NO2-对嘧菌酯在水中的光解具有光敏化作用，而在10～20 mg/L时则表现为光淬灭作用；Fe3＋及表面活性剂十二烷基硫酸钠（ SDS）对嘧菌酯在水中的光解具有光敏化作用，而腐殖酸和Fe2＋则对其表现为光淬灭作用。研究结果可为嘧菌酯的科学合理使用及其环境风险评估提供参考。
以500 W氙燈為光源，研究瞭嘧菌酯在水和有機溶劑中的光化學降解動態及其影響因素。結果錶明：噹質量濃度為5 mg/L時，嘧菌酯在純水中光解的半衰期為5?8 h，在2～20 mg/L範圍內，其光解速率隨初始質量濃度的增大而降低；嘧菌酯在不同介質中的光解速率從大到小依次為乙腈＞水＞甲醇＞正己烷＞丙酮，其半衰期分彆為4?8、5?8、11?5、12?1和23?5 h；硝痠鹽對嘧菌酯在水中的光解具有光敏化作用，噹NO3-質量濃度為1、2、10和20 mg/L 時，其半衰期分彆為5?5、5?1、4?5和3?9 h；在1～2 mg/L質量濃度下，NO2-對嘧菌酯在水中的光解具有光敏化作用，而在10～20 mg/L時則錶現為光淬滅作用；Fe3＋及錶麵活性劑十二烷基硫痠鈉（ SDS）對嘧菌酯在水中的光解具有光敏化作用，而腐殖痠和Fe2＋則對其錶現為光淬滅作用。研究結果可為嘧菌酯的科學閤理使用及其環境風險評估提供參攷。
이500 W선등위광원，연구료밀균지재수화유궤용제중적광화학강해동태급기영향인소。결과표명：당질량농도위5 mg/L시，밀균지재순수중광해적반쇠기위5?8 h，재2～20 mg/L범위내，기광해속솔수초시질량농도적증대이강저；밀균지재불동개질중적광해속솔종대도소의차위을정＞수＞갑순＞정기완＞병동，기반쇠기분별위4?8、5?8、11?5、12?1화23?5 h；초산염대밀균지재수중적광해구유광민화작용，당NO3-질량농도위1、2、10화20 mg/L 시，기반쇠기분별위5?5、5?1、4?5화3?9 h；재1～2 mg/L질량농도하，NO2-대밀균지재수중적광해구유광민화작용，이재10～20 mg/L시칙표현위광쉬멸작용；Fe3＋급표면활성제십이완기류산납（ SDS）대밀균지재수중적광해구유광민화작용，이부식산화Fe2＋칙대기표현위광쉬멸작용。연구결과가위밀균지적과학합리사용급기배경풍험평고제공삼고。
The photochemical degradation of azoxystrobin in several organic solvents and water plus their relevant effect factors were studied under the irradiation of Xenon lamp with 500 W. The results showed that the half-life of azoxystrobin in aqueous medium was 5?8 hours at the concentration of 5 mg/L. The photolytic rate became slower with increasing concentration of azoxystrobin in water at 2 to 20 mg/L. The photolytic rates of azoxystrobin in different media showed the following sequence:acetonitrile>water >methanol >n-hexane >acetone, the half-lives were 4?8, 5?8, 11?5, 12?1 and 23?5 h, respectively. In aqueous solutions, nitrate showed photosensitizing effect on the photo-degradation of azoxystrobin. At the NO3-concentrations of 1, 2, 10 and 20 mg/L, the half-lives were 5?5, 5?1, 4?5 and 3?9 h, respectively. The NO2- showed photosensitizing effect on the photo-degradation of azoxystrobin at the concentrations of 1 to 2 mg/L, but it showed photo-quenching effect at the concentrations of 10 to 20 mg/L. The presence of Fe3+ and surfactant of sodium dodecyl sulfate ( SDS) showed photosensitizing effect on the photo-degradation of azoxystrobin, but humic acids and Fe2+ quenched its photo-degradation. The results provided a scientific basic for rational use and environmental risk assessment of azoxystrobin.
