誘導結合プラズマ発光分析法のためのルテニウム合金試料の溶液化

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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 HNO_3 : HCl : H_2O = 1 : 3 : 4 and HNO_3 : HCl : H_2O = 1 : 1 : 2, respectively. Ce-Sn-Ru alloy samples were dissolved in a mixed add of HNO_3 : HCl : H_2O = 1 : 3 : 4, tartaric acid. And H_2O_2 at room temperature. Ru alloy samples that cannot be dissolved in any mixed acid need to be fused with a mixture of NaOH and Na_2O_2. The melts of Ru-Mn-Si alloy samples were dissolved with water. Followed by the addition of HC1 (1 + 1). Then residual Mn02 was dissolved by dropping H_2O_2, and white Zr oxide was filtered off. The melts of Mo-Ru-B alloy samples were dissolved in HNO_3 : HCl : H_2O = 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 H_2SO_4 (1 + 1), HNO_3 (1 + 1) and tartaric acid was added. Residual CeO_2 was dissolved by heating after the addition of H_2O_2. In this case, H_2SO_4 was used instead of HCl to prevent the volatilization of Ge.
2003-11-05

誘導結合プラズマ発光分析法のためのルテニウム合金試料の溶液化

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