CNAS-GL004 标准物质/标准样品的使用指南 Guidance on Using Reference Materials （IDT ISO Guide 33:2015） 中国合格评定国家认可委员会 2018年3月1 日发布 2018年3月1 日实施  CNAS-GL004:2018 第1页共34页 目录 前言.............................................................................2 1范围 ...........................................................................3 2规范性引用文件 .................................................................3 3术语及定义 .....................................................................3 4符号 ...........................................................................5 5约定 ...........................................................................5 6标准物质/标准样品及其在测量中的作用 ............................................6 7标准物质/标准样品和有证标准物质/标准样品的使用 ................................11 8精密度的评估 ..................................................................12 8.1通则 ........................................................................12 8.2重复测量次数 ................................................................12 8.3对标准物质/标准样品的要求....................................................13 8.4测量 ........................................................................13 8.5数据处理 ....................................................................14 8.6精密度的计算和评估...........................................................14 9偏倚的评估 ....................................................................15 9.1总则 ........................................................................15 9.2偏倚校核的途径 ..............................................................15 9.3偏倚数据应用 ................................................................16 10校准 .........................................................................17 10.1概述 .......................................................................17 10.2建立计量溯源性..............................................................17 10.3校准模型 ...................................................................18 11为其它材料赋值 ...............................................................18 11.1总则 .......................................................................18 11.2纯物质 .....................................................................19 11.3称量法和容量法..............................................................20 12约定标尺 .....................................................................21 12.1 总则......................................................................21 12.2 pH标尺.....................................................................22 12.3辛烷值 .....................................................................22 13有证标准物质/标准样品和标准物质/标准样品的选择................................23 13.1总则 .......................................................................23 13.2有证标准物质/标准样品的选择............