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Influence of Pressure on the Composition of Gaseous Reference Materials

机译:压力对气态参考材料组成的影响

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We have shown that the amount fraction of carbon dioxide in a nitrogen or synthetic air matrix stored in cylinders increases as the pressure of the gas mixture reduces, while the amount fraction of methane remains unchanged. Our measurements show the initial amount fraction of carbon dioxide to be lower than the gravimetric value after preparation, which we attribute to the adsorption of a proportion of the molecules to active sites on the internal surface of the cylinder and the valve. As the mixture is consumed, the pressure in the cylinder reduces and the amount fraction of the component is observed to increase. The effect is less pronounced in the presence of water vapor. More dramatic effects have been observed for hydrogen chloride. These findings have significant implications for the preparation of high accuracy gaseous reference materials with unprecedented uncertainties which underpin a broad range of requirements, in particular atmospheric monitoring of high impact greenhouse gases.
机译:我们已经表明,随着气体混合物的压力减小,储存在汽缸中的氮气或合成空气基质中的二氧化碳的量分数增加,而甲烷的量级分保持不变。我们的测量结果显示了制备后的重量值的二氧化碳的初始量分数,其归因于将分子比例的吸附到气缸和阀的内表面上的有源部位。当消耗混合物时,汽缸中的压力降低,并且观察到组分的量分数增加。在水蒸气存在下效果不太明显。已经观察到氯化氢的更多戏剧性效果。这些发现对制备高精度气态参考资料具有显着影响,具有前所未有的不确定性,该不确定因素是在广泛的要求范围内,特别是对高冲击温室气体的大气监测。

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  • 来源
    《Analytical chemistry》 |2018年第5期|共6页
  • 作者单位

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

    National Physical Laboratory Hampton Road Teddington Middlesex TW11 0LW United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分析化学;
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