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| Determination of Halogenated Greenhouse Gases in Ambient Air by Preconcentration/Gas Chromatography－Mass Spectrometry with Electron Capture Detector |
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| DOI： |
| KeyWord:halogenated greenhouse gases preconcentration gas chromatography－mass spectrometry gas chromatography－electron capture detector ambient air |
| Author | Institution |
| HE Hui，HUANG Zhong-hui，HUANG Zhong-kun，XIE Dan-ping，LIU Wang |
Guangdong Key Laboratory of Water and Air Pollution Control，South China Institute of Environmental Sciences，Ministry of Ecology and Environment，Guangzhou ，China |
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| Abstract: |
| Halogenated greenhouse gases（HGHGs） have a strong greenhouse effect due to their high global warming potential．However，the mixing ratios of ambient HGHGs are very low，and it is a challenge to accurately determine HGHGs in ambient air．A preconcentration gas chromatography－mass spectrometry with electron capture detector system（GC－MS/ECD） was established for the determination of 32 HGHGs in ambient air in this paper．The influences of capture flow，cold trap temperature and ECD temperature were investigated to obtain the optimal analysis conditions．Method validation experiments were carried out through the determination of 32 HGHGs．The results showed that good linear relationships in the range of 20－800 pmol/mol were obtained，and the correlation coefficients（r） for the 32 HGHGs were greater than 0.99．The method detection limits ranged from 0.21 pmol/mol to 1.17 pmol/mol，and the quantitation limits ranged from 0.84 pmol/mol to 4.68 pmol/mol．The spiked recoveries ranged from 92.5% to 104%，with relative standard deviations （RSDs） of 0.50%－6.4%．This method could satisfy the requirements for monitoring the HGHGs in ambient air，and it provides a reliable means for the analysis of HGHGs in ambient air. |
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