Development of multi-component organic gas standard for emergency monitoring
The paper introduces the development process of multi-component VOCs gas in nitrogen at 1 μmol/mol level which was checked using GC-MS coupled with select ion scanning mode.The 52 target components were selected to meet the monitoring requirements of hazardous volatile organic compounds specified in Chinese environmental standard HJ 1223-2021 Ambient air—Emergency determination of volatile organic compounds—Portable gas chromatography-mass spectrometry.The special gas cylinder equipped with a silanization valve was selected as the filling container through a gas cylinder screening experiment.The homogeneity and stability of the target compounds were tested using GC-MS.The results showed that the purge time was short,which improved the analysis efficiency,and better stability could meet the needs of on-site emergency determination.According to the uncertainty calculation formula given in GB/T 5274.1-2018,the relative expanded uncertainty was calculated as U=5%(k=2).
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