氟啶虫胺腈在不同有机溶剂中的光化学降解

利用液质联用和气相色谱（HPLC-Mass和GC）,研究了氟啶虫胺腈在两种不同光源下于4种不同溶剂（正己烷、甲醇、乙腈、丙酮）中的光化学降解.结果表明,以氙灯为光源,1.0、5.0、20.0mg·L-1的氟啶虫胺腈在4种溶剂中的降解半衰期分别为11.62、8.33、10.80h（正己烷）,5.30、5.81、7.05h（甲醇）,1.72、1.99、2.79h（乙腈）,83.49、37.46、64.77h（丙酮）.以紫外灯为光源,1.0、5.0、20.0mg·L-1的氟啶虫胺腈在4种溶剂中的降解半衰期分别为5.29、4.25、5.49min（正己烷）,2.19、2.97、5.88min（甲醇）,0.86、1.99、1.13min（乙腈）,330、365、198min（丙酮）.氟啶虫胺腈的降解反应主要为还原、水解反应,影响其降解速率的主要因素是光源和溶剂的种类,氟啶虫胺腈的浓度对其降解速度也有一定影响.

Photodegradation of sulfoxaflor in various organic solvents

Photochemical degradation of sulfoxaflor under two kinds of lights in four different solvents is studied based on HPLC-Mass and GC. With xenon lamp as the light source, the half-life of 1.0, 5.0 and 20.0 mg·L^-1 sulfoxaflor is 11.62, 8.33 and 10.80 hour in n-hexane, 5.30, 5.81 and 7.05 hour in methanol, 1.72, 1.99 and 2.79 hour in acetonitrile, and 83.49, 37.46 and 64.77 hour in acetone. With UV lamp as the light source, the half-life of 1.0, 5.0 and 20.0 mg·L^-1 sulfoxaflor is 5.29, 4.25 and 5.49 minute in n-hexane, 2.19, 2.97 and 5.88 minute in methanol, 0.86, 1.99 and 1.13 minute in acetonitrile, and 330, 365 and 198 minute in acetone. The major degradation pathways of sulfoxaflor are reduction and hydrolysis reaction. The main factors to affect the degradation rate are the light source and the type of solvent. Sulfoxaflor concentration also has some impact.