Certified Reference Materials for Micro-Analysis of Carbon and Nitrogen
Certified Reference Materials for Micro-Analysis of Carbon and Nitrogen
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用于碳和氮微量分析的认证标准物质
DOI：
10.1007/s00604-003-0155-5
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发表时间：
2004
影响因子：
5.7
通讯作者：
W. Sloof
中科院分区：
文献类型：
--
作者：
S. Saunders;P. Karduck;W. Sloof
摘要。电子探针微量分析（EPMA）的定量分析通常是参考已知成分（标准）的材料进行的，但由于电子轰击低原子序数元素产生的低x射线产率，在分析这些元素时存在一个特殊的问题。本文简要介绍了碳、氮两种元素的标准物质的生产和认证。本文选择了一种线状化合物渗碳体（Fe3C）作为碳的合适材料，γ′-Fe4N作为氮的合适材料。这两种化合物分别是在严格控制的条件下通过对纯铁进行渗碳或氮化制备的。特别强调的是均匀性研究，背景校正方法和使用这些参考材料的方法学验证。材料的认证含量与零之间建立了线性关系。认证值（6.69±k 0.13 wt% C和5.77±k 0.094 wt% N）被分配给该成分，其中k是覆盖因子。
Abstract.Quantitative analysis by electron probe micro analysis (EPMA) is usually carried out by reference to materials of known composition (standards) but because of the low X-ray yield arising from electron bombardment of low atomic number elements there is a particular problem when analysing these elements. This paper addresses the problem by describing briefly the production and certification of reference materials for two elements, carbon and nitrogen. Cementite (Fe3C), a line compound, was chosen as a suitable material for carbon and γ′-Fe4N for nitrogen. The compounds were produced by, respectively, carburising or nitriding pure iron under carefully controlled conditions. Particular emphasis is placed on a homogeneity study, background correction methods and methodology validation using these reference materials. A linear relationship was established between the certified content of the material and zero. Certified values (6.69±k 0.13 wt% C and 5.77±k 0.094 wt% N) were assigned for the composition, where k is the coverage factor.