Unité des Géosciences Marines Géosciences Marines, Laboratoire Cycles Géochimiques et ressources IFREMER Centre de Brest, Plouzané, France.
Unité des Géosciences Marines Géosciences Marines, Laboratoire Cycles Géochimiques et ressources IFREMER Centre de Brest, Plouzané, France.
J Chromatogr A. 2020 Nov 8;1631:461579. doi: 10.1016/j.chroma.2020.461579. Epub 2020 Sep 23.
Environmental sciences are expanding and are based on standardized and certified calibrations when measurements are required. When a gaseous composition is quantified, commercial standards are used. Here, we report on a two-component device for the preparation and injection of gas mixtures at the appropriate levels of pressure and volume. The two-component calibrator/injector can be used simultaneously or separately depending on the experimental objective but their combination is extremely effective for injecting gas mixtures at low concentrations. The quantity of gas introduced into a gas chromatograph with the injector can be adapted to the sensitivity of the detector or to avoid column overload. The calibrator provides for a large range of gas-mixture concentrations, from ppm to % mol/mol with an error of preparation of around 1% and an accuracy of less than 3%. This device prepares a variety of gas mixtures (hydrogen, methane and dioxide of carbon) which are compared with certified mixtures by means of gas chromatographic measurements. The results show good agreement between prepared and certified mixtures with a maximum difference of 2% which remains within the relative error of commercial standard. In addition, the preparation of dissolved methane at different concentrations in seawater is presented as a direct application of the calibrator.
环境科学在不断发展，在需要测量时基于标准化和认证的校准。当量化气态成分时，使用商业标准。在这里，我们报告了一种用于制备和注入适当压力和体积水平的气体混合物的两组件设备。两组件校准器/注射器可根据实验目的同时或单独使用，但它们的组合对于注入低浓度的气体混合物非常有效。通过注射器引入气相色谱仪的气体量可以适应检测器的灵敏度或避免柱过载。校准器提供了从 ppm 到 % mol/mol 的大范围气体混合物浓度，制备误差约为 1%，准确度小于 3%。该设备可制备各种气体混合物（氢气、甲烷和二氧化碳），并通过气相色谱测量与认证混合物进行比较。结果表明，制备混合物与认证混合物之间具有良好的一致性，最大差异为 2%，仍在商业标准的相对误差范围内。此外，还介绍了在海水中不同浓度溶解甲烷的制备，这是校准器的直接应用。
