同位素稀释质谱法（IDMS）测定微量铁的国际合作研究

The Interlaboratory Study for Fe Using Isotope Dilution Mass Spectrometry (IDMS)as the Reference Method

本文报道为完成国际计量学会（ＣＩＰＭ）化学计量工作组（ＷＧｏｆＭｅｔｒｏｌｏｇｙｉｎＣｈｅｍｉｃａｌＡｎａｌｙｓｉｓ）组织的ＩＤＭＳ国际合作研究建立的Ｆｅ的测量方法。浓缩的￣５７Ｆｅ溶液浓度用天然丰质的Ｆｅ标准溶液作为稀释剂用ＩＤＭＳ标定，然后用它作稀释剂，测量ＣＩＰＭ溶液Ⅱ中Ｆｅ。同其他国家提供的数据相比，本方法测量结果最佳．

In this paper the method for determining Fe in the CIPM solution Ⅱ is described for the first interlaboratory study of the CIMP Working Group on Metrology in Chemical Analysis. The concentration of enriched isotope solution of 57Fe was certified with the standard solution of Fe as spike by IDMS. Then the content of Fe in the CIPM solution Ⅱ was determined with certified enriched isotopic solution as spike. The measurement result shows that the content of Fe in the CIPM solution Ⅱ is 32.10±0.11(μg.g-1). This result as compared with other interlaboratiory values is the best.