一、引言ISO导则30中,标准物质(RM)的定义是具有一种或多种足够均匀和很好确定了的特性值,用以校准测量装置、评价测量方法或给材料赋值的一种材料或物质。有证标准物质(CRM)的定义是附有证书的标准物质,其一种或多种特性值用建立了溯源性的程序确定,使之可溯源到准确复现的用于表示该特性值的计量单位,而且 I. INTRODUCTION In ISO Guide 30, the definition of a reference material (RM) is one with one or more sufficiently uniform and well-defined characteristic values ​​to be used to calibrate a measuring device, to evaluate a method of measurement or to assign a value to a material Material or substance. Certified Reference Material (CRM) is defined as a certificate-bearing reference material whose one or more characteristic values ​​are determined by a traceability-establishing procedure traceable to an accurate recurrence of the Unit of measure, moreover