气体分析 校准气体混合物的制备 第2部分：II类混合物的重量分析法

[中文适用范围]： 本文件描述了 II 类校准气体混合物的静态重量法制备，并描述了一种计算与每种成分的量分数相关的测量不确定度的方法。除了未单独验证的混合物中提到的所有对测量不确定度的贡献，如 I 类混合物的情况。本文件扩展了 ISO 6142-1 中描述的不确定度评估，包括批量生产和验证过程的影响。它提供了有关如何得出代表特定类别混合物的不确定度预算的指导。本文件包括在单个过程中批量生产多种混合物的方法。本文件仅适用于气态或完全汽化成分的混合物，这些混合物可以以气态或液态引入气瓶。本文件涵盖二元和多组分气体混合物。本文件仅限于量分数大于或等于 100 μmol/mol 的非反应性分子/成分。本文件不包括那些相互反应、或与水蒸气或氧气等常见混合污染物发生反应或以吸收或吸附的形式与气瓶内表面和阀门发生反应的成分。 [外文原描述]： This document describes the static gravimetric preparation of Class II calibration gas mixtures and describes a method for calculating the measurement uncertainty associated with the amount fraction of each component. In addition to all of the contributions to the measurement uncertainty mentioned in ISO 6142-1, this document also considers the uncertainty resulting from the validation process for Class II mixtures that are not individually verified, as is the case for Class I mixtures. This document extends the uncertainty evaluation described in ISO 6142-1 to include the effects of batch production and the verification process. It provides guidance on how to derive an uncertainty budget that is representative of a particular category of mixtures. Methods for the batch production of more than one mixture in a single process are included in this document. This document is only applicable to mixtures of gaseous or totally vaporized components, which can be introduced into the cylinder in the gaseous or liquid state. Both binary and multi-component gas mixtures are covered by this document. This document is limited to non-reactive molecules/components that are greater than or equal to an amount fraction of 100 μmol/mol. This document excludes components that react with each other, or with common mixture contaminants such as water vapour or oxygen or react with the inner surface of the cylinder and valve in the form of absorption or adsorption.