Dissolution procedures for several ruthenium alloys in inductively coupled plasma-optical emission spectrometry

Yûetsu Danzaki, Kazuaki Wagatsuma

Research output: Contribution to journalArticlepeer-review

Abstract

It is relatively difficult to dissolve metallic Ru and Ru alloys by using acids; therefore, proper dissolution methods should be investigated for each Ru alloy. In general, the dissolution procedure should be selected depending on the elemental composition of the alloys. In addition, it should be noted that Ru oxide is easily volatilized by heating due to the low boiling point, possibly causing a serious loss of Ru. The following dissolution methods are recommended to obtain completely dissolved solutions as well as to prevent from the volatilization of Ru. Alloys containing Ru of less than 36% could be dissolved in proper acid mixtures. Al-Ru-Cu alloy samples and Ni-Al-Ru alloy samples could be dissolved by heating in HNO3:HCl:H2O = 1:3:4 and HNO3:HCl:H2O = 1:1:2, respectively. Ce-Sn-Ru alloy samples were dissolved in a mixed acid of HNO3:HCl:H2O = 1:3:4, tartaric acid, and H2O2 at room temperature. Ru alloy samples that cannot be dissolved in any mixed acid need to be fused with a mixture of NaOH and Na2O2. The melts of Ru-Mn-Si alloy samples were dissolved with water, followed by the addition of HCl (1 + 1). Then residual MnO2 was dissolved by dropping H2O2, and white Zr oxide was filtered off. The melts of Mo-Ru-B alloy samples were dissolved in HNO3:HCl: H2O = 1:3:4 and white Zr oxide was then dissolved by heating. The melts of Ce-Ru-Ge alloy samples were dissolved with water, and subsequently a mixed acid of H2SO4 (1 + 1), HNO3 (1 + 1) and tartaric acid was added. Residual CeO 2 was dissolved by heating after the addition of H2O 2. In this case, H2SO4 was used instead of HCl to prevent the volatilization of Ge.

Original languageEnglish
Pages (from-to)1047-1052
Number of pages6
JournalBUNSEKI KAGAKU
Volume52
Issue number11
DOIs
Publication statusPublished - 2003 Nov

Keywords

  • Alkaline fusion
  • Dissolution method
  • ICP-OES
  • Ru alloys

ASJC Scopus subject areas

  • Analytical Chemistry

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