| 摘要: |
| 气相色谱法检测废气中甲烷，样品保存容器可选择玻璃注射器、惰性气袋、真空瓶、苏码罐等，实验室对此做了比较研究。结果表明：玻璃注射器气密性较差，样品须在8h内完成分析；真空瓶携带不方便，苏码罐价格昂贵，两者使用较少；使用玻璃注射器采集，然后注入惰性气袋保存的方法最佳，样品至少可稳定保存7d。 |
| 关键词: 甲烷 气相色谱法 样品保存 |
| DOI： |
| 分类号:O657.7+1;X831 |
| 基金项目:国家环境监测标准方法制修订项目（2001300101036） |
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| Study on the Preservation Condition of Methane in the Waste Gas Sample |
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PENG Tao， XIA Qing， CHEN Lei
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Yangzhou Environmental Monitoring Centre， Yangzhou， Jiangsu 225007， China
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| Abstract: |
| In the process of determining methane in waste gas by gas chromatography， samples can be preserved in different containers such as the glass syringe， the inert gas bag， the vacuum bottle， and the SUMMA canister. This study focuses on comparison between these containers. The results showed that the glass syringe was poor in air tightness， therefore， the sample analysis must be completed within 8 hours. The vacuum bottle was inconvenient in carrying and the price of the SUMMA canister was expensive. As a result， both of the containers were less frequently used. The best option would be using the glass syringe for sampling and then storing in the inert gas bags. Samples preserved as such could be stable for at least 7 days. |
| Key words: Methane Gas chromatography Sample preservation |
