Laboratory of Sciences and Technology of the Environment, University Mentouri, 25000 Constantine, Algeria.
Photochem Photobiol Sci. 2012 Aug;11(8):1339-45. doi: 10.1039/c2pp25044f. Epub 2012 Jun 1.
The photo-induced transformation of monuron (3-(4-chlorophenyl)-1,1 dimethylurea) was investigated in an aqueous solution containing nitrates and nitrites at 310 nm and 365 nm, respectively. In both NO(3)(-) and NO(2)(-) conditions, the degradation of monuron followed pseudo-first order kinetics. The intermediate products were identified by GC-MS, and the nitration, hydroxylation and coupling reactions were determined. In addition, the oxidation of the N-terminus group, the substitution of chlorine by ˙OH and the nitration by ˙NO(2) radical onto the phenyl ring were observed. The photo-induced transformation of monuron was studied under variable conditions of pH, inducer concentration, substrate concentration, humic acids, oxygen content and salts used as hydroxyl radical scavengers. The photodegradation rates were strongly influenced by all the above parameters. The degradation of monuron was also studied in the dark and in the presence of NO(2)(-) as well as in an aqueous solution with the addition of hydrogen peroxide.
在分别含有硝酸盐和亚硝酸盐的水溶液中，于 310nm 和 365nm 下研究了敌草隆（3-(4-氯苯基）-1,1-二甲基脲）的光诱导转化。在 NO(3)(-)和 NO(2)(-)条件下，敌草隆的降解遵循准一级动力学。通过 GC-MS 鉴定了中间产物，并确定了硝化、羟化和偶联反应。此外，还观察到 N-末端基团的氧化、氯被˙OH 取代以及苯环上的˙NO(2)自由基硝化。在可变的 pH 值、诱导剂浓度、底物浓度、腐殖酸、氧含量和用作羟基自由基清除剂的盐条件下研究了敌草隆的光诱导转化。所有这些参数都强烈影响光降解速率。还在黑暗中和存在 NO(2)(-)以及在添加过氧化氢的水溶液中研究了敌草隆的降解。
