Study on Collection and Storage Stability Experiment of Helium Headspace Gas
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摘要: 氦气是一种不可或缺的稀有战略性物资，本文针对土壤氦气资源调查中氦气样品的顶空气采样方法，利用气相色谱仪的热导检测器，以氦气为对象，采用氦气标准气体研究了氦罐顶气的储存容器、保存介质、保存温度及保存期限。结果表明：玻璃材质的罐顶气瓶、饱和食盐水、低温、倒置保存是氦罐顶气样品的最佳保存方法；氦罐顶气在常温下的保存期限约为2个月，在低温冷藏（4℃）条件下的保存期限为3个月。因此，本研究提出氦气的罐顶气采集方法为：在500 mL玻璃气瓶中采集规定深度的新鲜土壤样品，然后注入饱和食盐水，留有约50 mL的空间，再用硅胶塞密封，倒置保存。针对常温和冷藏条件下保存的氦罐顶气应在相应的保存期限内完成检测，可以确保检测数据的准确性。Abstract: Helium is an indispensable and rare strategic element. A method of sampling the top helium gas in the helium gas resource investigation was used, and is described in this paper. Thermal conductivity detector (TCD) of the Gas Chromatograph was used to detect helium gas. The helium gas standard was used to study the helium gas storage container, the storage medium, the storage temperature, and the storage time. Results show that the glass jar, the saturated salt water, the low temperature, and the inverted storage are the best methods to save the head space gas. At room temperature, the helium head space gas storage period is about 2 months, whereas under refrigerated conditions (4℃), the storage time reaches 3 months. Therefore, the author suggests that the helium head space gas collection method is as follows. The fresh soil samples are collected in a 500 mL glass bottle, and then are injected into the saturated salt water. A 50 mL space remains in the bottle, and then the bottle is sealed by silica gel and kept inverted. For the helium top gas stored under normal temperature and refrigerated conditions, the test should be completed within the corresponding storage period to ensure the accuracy of the test data.
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表 1 不同储存容器处理的氦罐顶气瓶中氦气测量结果
Table 1. Analytical results of helium headspace gas in different storage conditions
储存条件 初始的氦气平均值(×10-6 mol/mol) 保存后的氦气测量平均值(×10-6 mol/mol) 保存前后氦气变化率(%) 塑料瓶 44.23 39.55 -10.6 玻璃瓶 44.29 42.64 -3.7 自来水 40.99 35.32 -13.8 纯净水 42.09 37.65 -10.5 饱和食盐水 44.29 41.80 -5.6 常温 44.29 41.80 -5.6 4℃冰柜 44.21 44.75 1.2 
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表 2 氦罐顶气在常温和冷藏保存不同时间的氦气含量
Table 2. Helium gas content of helium tank at different time in normal temperature or cold storage
温度条件 保存不同时间的氦气含量(×10-6) 初始值 7天 15天 21天 30天 60天 90天 120天 150天 常温 44.29 44.02 43.26 43.55 41.8 40.82 37.34 23.79 19.56 9.40 9.39 9.09 9.04 9.07 8.79 7.36 6.16 5.62 冷藏 44.21 44.74 43.37 43.2 44.75 43.27 42.91 35.53 25.97 9.43 9.47 9.45 9.37 9.28 9.21 9.04 7.45 6.53
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