本国际标准规定了以下方法: _通过与适当的参考气体进行比较，确定校准气体混合物的成分 混合物， _计算校准气体混合物成分的不确定度与已知的测量不确定度之间的关系 与之进行比较的参考气体混合物的成分， _通过与适当的参考气体进行比较，检查标定气体混合物的成分 混合物， _比较几种校准气体混合物的成分，例如为了比较不同的 气体混合物制备方法，或测试密切相关气体混合物的一致性的方法 作文 注:原则上，本文件中描述的方法也适用于（大部分）未知样品的分析 而不是预期的标定气体混合物（即拟用作标定气体混合物的气体混合物）。 这样的 然而，应用需要适当注意和考虑额外的不确定性成分，例如: 用于校准的参考气体和分析样品之间基质差异的影响。

This International Standard provides methods for _ determining the composition of a calibration gas mixture by comparison with appropriate reference gas mixtures, _ calculating the uncertainty of the composition of a calibration gas mixture in relation to the known uncertainty of the composition of the reference gas mixtures with which it was compared, _ checking the composition attributed to a calibration gas mixture by comparison with appropriate reference gas mixtures, _ comparing the composition of several calibration gas mixtures, e.g. for the purpose of comparing different methods of gas mixture preparation, or for testing consistency among gas mixtures of closely related composition. NOTE In principle, the method described in this document is also applicable to the analysis of (largely) unknown samples instead of prospective calibration gas mixtures (i.e. gas mixtures which are intended for use as calibration gas mixtures). Such applications, however, require appropriate care and consideration of additional uncertainty components, for example concerning the effect of matrix differences between the reference gases used for calibration and the analysed sample.