GC-MS测定环境空气中13种醛酮类化合物

Determination of 13 aldehyde and ketone compounds in ambient air by GC-MS

建立了罐采样-冷柱温-气相色谱质谱法测定环境空气中13种醛酮类化合物的方法,采用全扫描模式(SCAN)和选择性离子模式(SIM)同时进行测定,内标法定量。结果表明:当取样量为400mL时,13种醛酮类化合物在0.005~75.2nmol·mol^(-1)的浓度范围内具有良好的线性关系,平均相对响应因子的RSD均小于15.0%,方法检出限为0.005~0.10nmol·mol^(-1);在0.5.5.0、20.0nmol·mol^(-l)三个加标浓度下,加标回收率在78.8~106%之间。此外,采用液相色谱法和气相色谱质谱法测定济南的三个不同功能区(背景区、城市、郊区)的样品,两种测定方法比较的结果说明13种醛酮类化合物具有较好的一致性,从而证明了气相色谱质谱法测定13种醛酮类化合物的可行性。本方法无需添加任何有毒有害化学试剂,操作简单,灵敏度高,稳定性好,效率高。不仅很好地解决了丙烯醛和丙酮的基线分离问题,而且还能准确地定量测定空气中13种醛酮类化合物。

An analytical method that combined summa canisters-cryfocus with GC-MS was established for the detection of 13 aldehyde and ketone compounds in ambient air,full scan mode(SCAN)and selective ion mode(SIM)were used for determination,and internal standard method was used for quantification.The results showed that when the injection volume was 400 mL,13 aldehyde and ketone compounds showed good linear relationships within the linear range of 0.005~75.2 nmol·mol^(-1),and(RSDs)of the average relative response factor were less than 15.0%.The limits of detection(LODs)of all target compounds were between 0.005 and 0.10 nmol:mol-l.At three spiked levels of 0.5,5.0,20.0 nmol:mol^(-1),the relative recovery rates were between 78.8%and 106%.In addition,the samples of three different functional areas(background area,urban area and suburban area)in Jinan were determined by liquid chromatography and gas chromatography mass spectrometry.The results of the comparison between the two methods showed that the aldehydes and ketones had good consistency,which proved the accuracy of the determination of 13 aldehydes and ketones by gas chromatography and mass spectrometry.This method had the advantage of no need to add any toxic and harmful chemical reagents,simple operation,high sensitivity,good stability,high efficiency.The problem of baseline separation of acrolein and acetone had been well solved and also it could be used to quantify 13 aldehyde and ketone compounds in ambient air.