高純度亜鉛の定量分光分析法の実施に関する諸問題

抄録

Practical problems concerning the application of proposed spectrochemical method to routine industrial analysis were studied. (1) The loss of impurity Sn in the course of dissolution of sample Zn in HC1 and of the subsequent concentration of the dilute ZnCl₂ solution to 1.95 in specific gravity is prevented by small addition of H₃PO₄. (2) The allowable range of specific gravity in preparation of sample solution is 1.98∼1.93, in which the variation of ZnCl₂ concentration does not affect the analytical precision and accuracy. (3) The procedures of background correction,proposed in ASTM E116-56T, were studied and simplified by using the galvanometer deflection, instead of optical density or Seidel function. (4) Spectrochemical sensitivities of 13 elements in ZnCl₂ 70% solution,which are presented in Table 3, were studied under the previously proposed conditions. (5) Some analytical results of commercial high purity Zn, are shown in Table 4 as practical example of this spectrochemical analysis.