气体预浓缩-气质联用仪信噪比不确定度评定

本文介绍了采用气体预浓缩方法进样的气相色谱-质谱联用仪在环境空气质量监测技术中的应用,以氮气中有机挥发物苯为标准物质,对其信噪比测得值的不确定度进行了评定,当采样量为400mL时,测得峰面积测量重复性为1.1％,信噪比为472,信噪比测得值的相对扩展不确定度为Urel=11％,k=2.

Uncertainty Evaluation of SNR of Chromatography-mass Spectrometry with Pre-concentration of Gas

In this paper,the application of Agilent Gas Chromatography-Mass Spectrometry based on pre-concentration of gas in the detection technology of ambient air quality was introduced.And take the organic volatile benzene in nitrogen as a reference material,the uncertainty of signal-to-noise ratio(SNR) measurement result was evaluated,when the sampling volume is 400 mL,the measurement repeatability of peak area was 1.1%,the SNR was 472 and the relative expanded uncertainty of SNR measurement result was U_rel=11%,k=2.