气雾剂二甲醚中三甲胺的气相色谱分析
Determination of Trimethylamine in Dimethyl Ether Aerosol by Gas Chromatography
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摘要: 采用CP-PoraPLOT Amines色谱柱,火焰离子化检测器(FID),气相色谱法对二甲醚中三甲胺进行定性、定量分析。操作简单,与自动取样阀连用可实现在线监测。结果表明,在不需富集的情况下检出限可达0.51×10-6(体积分数),回收率为98%~103％,相对标准偏差(RSD,n=7)为1.07%,完全满足工业在线监测的需要。Abstract: For the problems that trimethylamine and dimethyl ether is not effectively separated and the enrichment process for trimethylamine is more complicated when conventional capillary or packed columns were used for separation and determination of trimethylamine in dimethyl ether aerosol by gas chromatography, a new method using CP-PoraPLOT Amines column and FID detector has been developed. The new method can provide both qualitative and quantitative analytical data for trimethylamine in dimethyl ether aerosol. On-line monitoring of trimethylamine can also be realized when auto-sampling valve is used. The detection limit of the method for trimethylamine is 0.51×10-6 (V/V) and the recovery of the method is 98%~103% with procession of 1.07% RSD (n=7). The method is suitable for online monitoring of trimethylamine in industrial production.
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