誘導結合プラズマ発光分析法による各種イリジウム-アルミニウム合金の組成分析

概要

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For the analysis of samples by inductively coupled plasma-optical emission spectrometry (ICP-OES), dissolution of the samples is important. Classical lead assay, chlorination, fluorination and dissolution with acids are difficult for the dissolution of Ir-base alloys. Therefore, fusion with Na2O2 has been used. However, when the alloys are fused with it in a Zr crucible, the crucible is partially dissolved together with Na2O2. The dissolved Zr interferes with the measurements of analytes in the samples by spectral interferences of Zr. To dissolve the crucible as little as possible, it was fused with a mixture of 1 g of NaOH and 2 g of Na2O2; the amount of Zr dissolved was 20∼130 mg. Salts given by fusion were dissolved in HNO3-HCl. The analytes in the solution were determined by ICP-OES and the interferences of coexistent elements on the spectral intensities of analytes were corrected by sequential correction method. Good analytical results were obtained for lr-base alloy samples.
2002-10-05