摘要
以紫外灯和氙灯为光源对联苯肼酯的光化学降解进行研究,利用高效液相色谱-二极管阵列检测法(HPLC-DAD)进行定性和定量分析,利用气质联用技术GC-MS)对联苯肼酯光降解产物进行初步推断.实验结果表明,在紫外灯光照下联苯肼酯在正己烷、乙腈、丙酮、水中的半衰期分别为3.60—7.67 min、3.64—10.30 min、16.31—26.45 min、23.02 min;在氙灯照射下联苯肼酯在正己烷、乙腈、丙酮、水中的半衰期分别为0.36—0.53 h、0.91—1.30 h、1.50—2.53 h、5.02 h.在两种光源照射下联苯肼酯在所有溶液中的光降解反应均符合一级反应动力学规律,光解速率为:正己烷>乙腈>丙酮>水,联苯肼酯的光降解反应初步推断为氧化、水解反应.影响其降解速率的主要因素是光源、溶剂的种类以及溶液的初始浓度.
The UV lamp and xenon lamp as light source, research photochemical degradation dynamics of bifenazate. HPLC-DAD was used for the qualitative and quantitative analysis, and GC-MS was used to carry on preliminary inference on the photodegradation products. When irradiated with ultraviolet lamp, the half-life of bifenzate is 3.6--7.67 min, 3.64--10.30 min, 16.31--26.45 rain, 23.02 min in n-hexane acetonitrile, acetone, and water, respectively. When irradiated with xenon lamp, the half-life is 0. 36---43. 53 h, 0.91--1.30 h, 1.50--2.53 h, and 5.02 h in n-hexane aeetonitrile, acetone, and water, respectively. The order of photo ehemical degradation rate in different solvents is hexane 〉 acetonitrile 〉 acetone 〉 water. The major degradation pathways of bifenazate are oxidation reaetion and hydrolysis reaction. The main factors to affect the degradation rate are the light source and the type of solvent. Bifenazate concentration also has some impact.
出处
《环境化学》
CAS
CSCD
北大核心
2014年第2期334-340,共7页
Environmental Chemistry
基金
湖南省教育厅科学研究重点项目(11A053)
湖南省自然科学基金项目(13JJ5023)资助
关键词
联苯肼酯
高效液相色谱
气质联用
光化学降解
光降解产物
bifenazate, high performance liquid chromatography, gas chromatography massspectrometry, photochemical degradation, photodegradation products.
