| 李宝江,孙彤彤,王睿,王迎红,韩圣慧,姚志生,郑循华.温室气体浓度检测的玻璃瓶存储时间探讨[J].农业环境科学学报,2025,44(9):2466-2477. |
| 温室气体浓度检测的玻璃瓶存储时间探讨 |
| A study on storage time of glass vial for measurement of greenhouse gas concentration |
| 投稿时间：2024-11-06 |
| DOI：10.11654/jaes.2024-0961 |
| 中文关键词: 温室气体 存放时间 浓度水平 刺孔数 静态箱法 |
| 英文关键词: greenhouse gases storage time concentration level number of punctures static chamber method |
| 基金项目:国家重点研发计划项目（2023YFC3707401，2022YFE0137100）；河北省省级科技计划项目（22373903D） |
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| 中文摘要: |
| 为评估玻璃瓶长期存储过程中温室气体样品浓度的稳定性，确保测量结果的准确性，本研究针对存储不同浓度（大气本底浓度的0.8~30倍）的温室气体标准样品，以及对密封垫（氯化丁基橡胶）进行0~30次刺孔的玻璃瓶，采用气相色谱仪对样品在存放120 d期间的浓度进行7次测定。结果显示：存放时间、样品浓度和刺孔数共同影响了温室气体浓度偏差。对于二氧化碳（CO2）样品，建议存放时间不超过 14 d 以确保浓度偏差小于 2%；若超过 14 d，偏差增至 2%~5%，而超过 90 d 则不再推荐使用。甲烷（CH4）样品可存放≤30 d以保持＜2%的偏差，≤120 d仍可维持≤5%的偏差，尤其在较高浓度下表现得更为稳定。氧化亚氮（N2O）样品在≤14 d内存放可保持＜2%的偏差，存放30 d以上偏差增加至2%~5%，超过60 d则不再推荐使用，特别是高浓度样品。为了确保数据准确性（＜2%偏差），建议CO2和N2O样品尽量在14 d内分析，CH4样品则应在30 d内完成分析。基于该存放时间，建议玻璃瓶刺孔数应≤20次。 |
| 英文摘要: |
| 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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