顶空-气相色谱法与顶空-气质联用法测定饮用水中苯系物的方法建立及比较  

The Establishment and Comparison of HS-GC and HS-GC-MS Methods for The Determination ofBenzenes in Drinking Water

作　　者：庄景新[1] 吴云钊[1] 乔庆东[1] 曹民[1] 姜永丽[1] 朱雅旭[1] ZHUANG Jingxin;WU Yunzhao;QIAO Qingdong;CAO Min;JIANG Yongli;ZHU Yaxu(Physical and Chemical Laboratory,Centers for Disease Prevention and Control of Changping,Beijing 102200,China)

机构地区：[1]北京市昌平区疾病预防控制中心理化检验科,北京102200

出　　处：《现代食品》2024年第7期188-192,共5页Modern Food

摘　　要：目的:建立顶空-气相色谱法及顶空-气质联用法测定饮用水中常用7种苯系物(苯、甲苯、乙苯、间二甲苯、对二甲苯、邻二甲苯和苯乙烯),探讨两种测定方法的一致性。方法:优化了顶空、色谱、质谱等测定条件,对两种方法的检出限、精密度、准确度进行比较。结果:两种方法的回收率均在90.4%~100.2%,相对标准偏差均在1.1%~4.3%,顶空-气相色谱法的最低检出浓度分别为0.03~0.08μg·L^(-1),顶空-气质联用法的最低检出浓度分别为0.002~0.005μg·L^(-1),测定结果无显著性差异。结论:两种方法操作简单、快速,准确度和灵敏度高,均适用于饮用水中苯系物的日常检测。顶空-气质联用法的灵敏性更高,适用于痕量、基质复杂样品的测定;顶空-气相色谱法适用于高浓度样品的测定。Objective:To establish headspace gas chromatography and headspace GC/MS methods for the determination of seven benzene homologues(benzene,toluene,ethylbenzene,m-xylene,p-xylene,o-xylene and styrene)in drinking water,and to discuss the consistency of the two methods.Method:The conditions of headspace,chromatography and mass spectrometry were optimized,and the detection limits,precision and accuracy of the two methods were compared.Result:The recoveries of the two methods were 90.4%~100.2%,the relative standard deviations were 1.1%~4.3%,and the lowest detectable concentrations of headspace gas chromatography were 0.03~0.08μg·L^(-1),the lowest detectable concentration of headspace GC-MS was 0.002~0.005μg·L^(-1),there is no significant difference in the determination results.Conclusion:The two methods are simple,rapid,accurate and sensitive,and are suitable for the daily detection of benzene homologues in drinking water.Headspace GC/MS method is more sensitive and suitable for the determination of trace and matrix complex samples;Headspace gas chromatography is suitable for the determination of high concentration samples.

关 键 词：饮用水 苯系物 顶空 气相色谱法 气质联用法 

分 类 号：R115[医药卫生—公共卫生与预防医学]