离子漏斗聚焦光致化学电离质谱法在线同时测定7种大气羰基化合物  

Online detection of 7 carbonyls in the atmosphere by ion funnel focusing photoionization-induced chemical ionization mass spectrometry

作　　者：崔华鹏[1] 任美慧 刘志景[3] 秦亚琼[1] 刘瑞红 刘雨 陈满堂 蒋吉春 谢复炜[1] 刘绍锋[1] CUI Huapeng;REN Meihui;LIU Zhijing;QIN Yaqiong;LIU Ruihong;LIU Yu;CHEN Mantang;JIANG Jichun;XIE Fuwei;LIU Shaofeng(Zhengzhou Tobacco Research Institute of CNTC,Zhengzhou 450001,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;Henan University of Animal Husbandry and Economy,Zhengzhou 450000,China)

机构地区：[1]中国烟草总公司郑州烟草研究院,郑州450001 [2]中国科学院大连化学物理研究所,辽宁大连116023 [3]河南牧业经济学院,郑州450000

出　　处：《化学分析计量》2024年第8期18-23,共6页Chemical Analysis And Meterage

基　　金：河南省科技攻关项目(222102320158,232102110135)。

摘　　要：建立离子漏斗聚焦光致化学电离质谱在线同时测定7种大气羰基化合物的方法。基于飞行时间质量分析器,发展了离子漏斗聚焦光致化学电离源,通过光电子产生的H3O+试剂离子对羰基化合物分子进行化学电离,获得羰基化合物[M+H]+或[M-H2O+H]+的特征离子峰,利用特征峰面积外标法定量。甲醛、乙醛、丙酮、正丁醛、正戊醛、正己醛和苯甲醛7种羰基化合物在气体体积分数为5×10^(-9)~250×10^(-9)范围内与各目标物的质谱特征峰面积线性关系良好,相关系数均大于0.998,检出限为0.010×10^(-9)~0.087×10^(-9)。样品加标回收率为93.5%~107.7%,测定结果的相对标准偏差为1.2%~5.4%(n=5)。该方法适用于环境研究领域中大气羰基化合物的在线监测。A method was established for online detecting of 7 carbonyls in the atmosphere by ion funnel focusing photoionization-induced chemical ionization mass spectrometry.Based on a time-of-flight mass analyzer,an ion funnel focusing photoionization-induced chemical ionization was developed to ionize carbonyls molecules through H3O+reagent ions generated by photoelectrons.The characteristic ion peaks[M+H]+or[M-H2O+H]+of carbonyls were obtained.The area of characteristic ion peak was used for carbonyls quantification with external standard method.The gas volume fraction of formaldehyde,acetaldehyde,acetone,butyraldehyde,glutaraldehyde,n-hexanal and benzaldehyde were in the range of 5×10^(-9)-250×10^(-9).There was a good linear relationship between the volmue concentration of the area of characteristic ion peaks with the correlation coefficients not less than 0.998,the detection limits were in the range of 0.010×10^(-9)-0.087×10^(-9).The recoveries of spiked sample were 93.5%-107.7%,and the relative standard deviations of the determination results were 1.2%-5.4%(n=5).This method is easy to operate and highly sensitive,and it is applicable for online monitoring of carbonyls in the atmosphere.

关 键 词：光致化学电离 离子漏斗 质谱 羰基化合物 

分 类 号：O657.63[理学—分析化学]