摘要
近年来,氨基取代和硝基取代的氯苯新污染物,在水体、土壤和大气中频繁被检出。2,3二氯苯胺和邻氯硝基苯作为这些新污染物中具有代表性的化合物,示踪它们在水环境中的迁移转化过程至关重要,亟需新方法支撑。为了分析水体中的2,3-二氯苯胺和邻氯硝基苯的单体同位素指纹,本文开发了一种基于气相色谱-四极杆质谱(GC-qMS)的氯单体同位素(CSIA)分析方法。通过优化样品加热温度、仪器分流比和驻留时间等参数,确定该方法的最优仪器条件,同时,建立2,3-二氯苯胺和邻氯硝基苯的浓度标准曲线,实现单体氯同位素和浓度的同步分析。此外,分别用分子离子法和碎片离子法计算2,3-二氯苯胺和邻氯硝基苯的氯同位素比值,并对这两种计算方法进行比较,为2,3-二氯苯胺和邻氯硝基苯的氯单体同位素分析提供一种快速、可靠的分析方法。
Recently,amino-substituted and nitro-substituted chlorobenzene pollutants have been frequently detected in water,soil,and air.As representative compounds,2,3-dichloroaniline and o-clonitrobenzene require novel tools to track their fate and transport in aquatic environments.To obtain isotopic signatures of 2,3-dichloroaniline and o-clonitrobenzene in water,we developed a chlorine compound-specific isotope analysis(CSIA)method based on a common gas chromatography-quadrupole mass spectrometry(GC-qMS).Specifically,parameters,including heating temperatures,split ratios,and dwell times,were optimized for 2,3-dichloroaniline and o-clonitrobenzene.The standard concentration calibration curves were also established under the optimal instrumental conditions,which allowed the simultaneous determination of chlorine isotopic ratios and concentrations for the target compounds.The chlorine isotope ratios of 2,3-dichloroaniline and o-clonitrobenzene were determined using the molecular ion method and fragment ion method,respectively,and the results obtained by the two methods were subsequently compared.In conclusion,our study provides a fast and robust approach for chlorine CSIA of 2,3-dichloroaniline and o-chlonitrobenzene.
作者
武婉璐
张玲玲
王强
金彪
WU Wanlu;ZHANG Lingling;WANG Qiang;JIN Biao(State Key Laboratory of Advanced Environmental Technology,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球化学》
北大核心
2025年第4期515-521,I0001-I0005,共12页
Geochimica
基金
广东省省级科技计划项目(2023B1212060049)
广州市基础与应用基础研究科技菁英领航项目(2024000034)资助。
关键词
新污染物
单体同位素分析
氯同位素
2
3-二氯苯胺
邻氯硝基苯
emerging contaminants
compound specific isotope analysis
chlorine isotopes
2,3-dichloroaniline
o-clonitrobenzene
