电子制冷预浓缩-GC/MS测定环境空气中ODS及其他受控卤代烃

Determination of ODS and other controlled halogenated hydrocarbons in ambient air by electronic refrigeration preconcentration-GC/MS

建立电子制冷预浓缩-气相色谱/质谱法(GC/MS)测定空气中33种消耗臭氧层物质(ODS)及其他受控卤代烃的测定方法.测试了不同聚焦冷阱、预处理条件、不同色谱柱分离效果的条件实验,最终获得了最佳的冷阱配置方案及实验条件.结果表明,33种ODS及其他受控卤代烃校准曲线相关系数均在0.99以上;精密度范围为0.5%—6.2%,加标回收率范围在91.2%—102%;进样体积为800 mL时,各目标化合物的检出限范围为0.07—0.57 pmol·mol^(-1),定量下限范围为0.28—2.28 pmol·mol^(-1),本方法可满足环境空气中33种ODS及其他受控卤代烃的分析需求.

A method for the determination of 33 ozone-depleting substances(ODS)and other controlled halogenated hydrocarbons in air was established by using electronic refrigeration preconcentration-gas chromatography/mass spectrometry(GC/MS).The experiments include the optimization of focusing cold traps and pretreatment conditions,the comparison and conditioning experiments of the separation effects of different chromatographic columns.The optimal cold trap configuration scheme and experimental conditions were obtained,and the applicability of the method was investigated through the measurement of actual samples.The results of experiment showed that the correlation coefficients of calibration curves were above 0.99;their precisions were 0.5%—6.2%;When the injection volume was 800 mL,the method detection limits ranged from 0.07 pmol·mol^(-1)to0.57 pmol·mol^(-1),and the lower limit of quantification was in the range of 0.28—2.28 pmol·mol^(-1).Through the analysis of actual samples of ambient air,it is suitable to analyse 33 ODS and other controlled halogenated hydrocarbons in ambient air.