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| A study on storage time of glass vial for measurement of greenhouse gas concentration |
| Received:November 06, 2024 |
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| KeyWord:greenhouse gases;storage time;concentration level;number of punctures;static chamber method |
| Author Name | Affiliation | E-mail | | LI Baojiang | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | | SUN Tongtong | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
School of Geographical Sciences, Northeast Normal University, Changchun 130024, China | | | WANG Rui | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | wangrui@mail.iap.ac.cn | | WANG Yinghong | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | | HAN Shenghui | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | | YAO Zhisheng | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | | ZHENG Xunhua | State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100029, China | |
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| Abstract: |
| This study aims to evaluate the stability of greenhouse gas sample concentrations during long-term storage in glass vials, which will help ensure the accuracy of measurement results. For glass vials storing greenhouse gas standard samples at different concentrations （ranging from 0.8 times to 30 times the atmospheric background concentration）, and with seals made of chlorobutyl rubber subjected to 0 to 30 punctures, the concentrations of the gas samples were measured seven times over a 120-day storage period using a gas chromatograph. The results showed that the deviation in greenhouse gas concentrations was influenced by the combined effects of storage time, sample concentration, and the number of punctures. For carbon dioxide（CO2）samples, it is recommended that the storage time should not exceed 14 days to ensure a concentration deviation of less than 2%. If the storage time exceeds 14 days, the deviation increases to 2%-5%, and storage beyond 90 days is not recommended. Methan（CH4）samples can be stored for up to 30 days to maintain a deviation of less than 2%, and up to 120 days to maintain a deviation of ≤5%, with higher concentrations showing better stability. Nitrous oxide（N2O） samples can be stored for up to 14 days with a deviation of less than 2%, but the deviation increases to 2%-5% if stored for 30 days, and storage beyond 60 days is not recommended, especially for high-concentration samples. To ensure data accuracy（deviation ＜2%）, it is recommended to analyze CO2 and N2O samples within 14 days, and CH4 samples within 30 days. Based on the recommended storage time, it is suggested that the number of punctures in the glass vials should be fewer than 20. |
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