摘要
对不同pH下Chlortoluron氯化后生成的非挥发性中间产物和挥发性产物进行了研究。对Chlortoluron氯化后的非挥发性中间产物的UPLC-ESI-MS鉴定发现了m/z为213、229、263、281、和247的离子,分析表明它们分别是Chlortoluron及其一羟基、一氯羟基、二氯和一氯衍生物。对Chlortoluron氯化后的挥发性产物采用吹扫补集-GC-MS进行分析鉴定发现了三氯甲烷(CF)、二氯硝基甲烷(DCNM)、二氯乙腈(DCAN)、1,1-2-二氯丙酮(1,1-DCP)、三氯硝基甲烷(TCNM)和1,1,1-2-三氯丙酮(1,1,1-TCP)六种消毒副产物。根据本研究中的实验结果分析和推测,在Chlortoluron的氯化过程中,苯环上和脲基链上都经历了羟基化、氧化和取代反应,接着苯环被打破,随后生成了更为有害的副产物,基于此,本文推断了Chlortoluron的氯化降解途径。
Non-volatile intermediates and volatile products of Chlortoluron during chlorination under different pH values were investigated in this study.UPLC-ESI-MS analysis found non-volatile intermediates with m/z 213,229,263,281,and 247 ions,which are Chlortoluron itself and its hydroxylated,chlorohydroxy,dichloromonohydroxy and monohydroxy derivatives respectively.The volatile products were identified by gas chromatography-mass spectrometry （GC-MS） with purge-and-trap pretreatment,results of which revealed the existence of chloroform （CF）,dichloro-nitromethane（DCNM）,chloropicrin（TCNM）,dichloroacetonitrile（DCAN）,1,1-dichloroacetone （1,1-DCP）,1,1,1-trichloro-acetone（1,1,1-TCP）.According to the analysis of experimental results in this study,reaction mechanism can be speculated as follows：during chlorination process of Chlortoluron,hydroxylation,oxidation and substitution reaction occured both on phenyl ring and ureido chain,then the phenyl ring was broken open,and more harmful byproducts were generated subsequently.Degradation pathways of Chlortoluron chlorination were then proposed on this account.
出处
《环境保护科学》
CAS
2013年第4期7-12,共6页
Environmental Protection Science
基金
国家自然科学基金资助项目(51078280)
