誘導結合プラズマ発光分析法のための各種バナジウム含有合金の溶解法

概要

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Proper dissolution methods for various V alloys were examined for elemental determination in inductively coupled plasma-optical emission spectrometry (ICP-OES). Several kinds of V alloys were developed for various purposes. Among them, alloys co-containing Ti, Nb, and Ta are being employed as structural materials. Hydrolytic reactions of these elements occur in aqueous solution easily ; therefore, an agent should be added to prevent their hydrolysis. Hydrogen peroxide is an effective agent against hydrolysis. However, when H_2O_2 is added to solutions containing V, it accelerates the decomposition of H_2O_2 and then 0_2 gas generates, which leads to poor precision of the analytical results in ICP-OES. Therefore, a proper dissolution method for each V alloy should be developed without usage of H_2O_2. V-Cr, V-Fe and V-Mo alloys were dissolved in a HNO_3-HCl solution. V-Zr, Ti-Al-V and Ni-Ti-V alloys were finished as a H_2S0_4 solution after dissolving in HN0_3-HF and fuming with H_2SO_4. A V-Nb alloy was added to a H_2S0_4-tartaric acid solution after dissolving in HN0_3-HF and fuming with H_2SO_4. A Nb-Al-V alloy was dissolved in N0_3-HF at room temperature. Nb-Cr-V alloys were finished as a H_2SO_4-HF solution after dissolving in HNO_3-HCl-HF, followed by fuming with H_2SO_4 and adding HF.
2003-10-05