采用脉冲火焰光度检测器进行丙烯中含硫化合物的气相色谱分析

GC Analysis of Sulfur Components in Propylene Using a Pulsed Flame Photometric Detector

在气相色谱分析中采用Agilent J&W低硫选择性色谱柱及硫特异性检测器如脉冲火焰光度检测器(PFPD),可将含硫化合物从基质中高效地分离出来,因而可对丙烯基质中痕量H2S,COS与CH3SH进行检测。将含硫化合物从基质中分离出来再检测,可避免基质引起的抑制效应并提高含硫化合物的响应。该色谱柱为活性含硫化合物如H2S提供了较好的响应,使含量低至20ppb的检测成为可能。尽管这是一种多孔层开管柱(PLOT),但它不会出现颗粒物质脱落现象,色谱图无锐峰。因此,与阀结合使用是安全的。

The Agilent JW Select Low Sulfur column used in a GC with a sulfur-specific detector, such as a PFPD, can detect H2S, COS, and CH3SH at trace levels in a propylene matrix as a result of effective separation of the sulfur compounds and the matrix. Separating the matrix from the sulfur components eliminates the quenching effects caused by the matrix, and gives a better response for the sulfur compounds. The column provides a good response for reactive sulfur compounds, such as H2S, which makes detections of 20 ppb possible. Although this is a PLOT column, no spikes will be observed because the column does not shed particles. It can therefore be used safely in combination with valves.