离子色谱法测定环境空气和废气中的挥发性胺类化合物

Determination of Volatile Amines in Ambient Air and Waste Gas by Ion Chromatography

建立离子色谱法同时测定环境空气和废气中二甲胺、二乙胺和三乙胺等挥发性胺类化合物的方法。以甲磺酸(MSA)-乙腈水溶液为吸收液,采集环境空气或废气中的挥发性胺类化合物,利用Metrosep C4-250/4.0阳离子交换柱分离目标化合物,881 compact IC pro 1电导检测器进行检测,以保留时间定性、峰面积定量。结果显示:二甲胺、二乙胺和三乙胺标准曲线线性关系良好,相关系数在0.9992~0.9999之间,废气中二甲胺、二乙胺和三乙胺的检出限分别为0.24,0.30和0.42 mg/m^(3);环境空气中二甲胺、二乙胺和三乙胺的检出限分别为0.06,0.10和0.14 mg/m~3。该方法样品无需复杂的前处理过程,操作简单、分析速度快、准确度高,可同时测定共存于环境空气和废气中的二甲胺、二乙胺和三乙胺。

A method for simultaneous determination of volatile amine compounds such as dimethylamine,diethylamine and triethylamine in ambient air and waste gas by ion chromatography was established.Methy sulfonic acid(MSA)-acetonitrile water solution was used as absorption solution to collect volatile amines in the ambient air or waste gas.Volatile amines were separated by Metrosep C4-250/4.0 cation exchange column,and detected by 881 compact IC pro 1 conductivity detector.The retention time was qualitative and the peak area was quantitative.The results showed that the standard curves of dimethylamine,diethylamine and triethylamine showed good linearity with correlation coefficients ranging from 0.9992 to 0.9999.The limits of detection(LOD)of dimethylamine,diethylamine and triethylamine were 0.24,0.30 and 0.42 mg/m^(3) in waste gas,respectively,while the LODs of volatile amines were 0.06,0.10 and 0.14 mg/m^(3) in ambient air.It is a simple,quick and accurate method without complex pretreatment.Dimethylamine,diethylamine and triethylamine coexisting in the and waste gas ambient air can be simultaneously determined.