硫酸銅標準液によるフェロモリブデン中のモリブデンの迅速定量法

概要

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An acidified solution of Mo with an approxinately 6N HCl is treated with a small amount of sulfuric acid and safranine indicator, the solution is reduced with liquid cadmium amalgam to convert the Mo to Mo (III) and titrated with 0. 1N CuSO4 solution for conversion of the Mo to Mo (V) and Cu to Cu (I), respectively, and addition of one drop excess of the 0. 1N CuSO4 to give a clear purple coloration of safranine. In this reaction, kind of acids used, its concentration, the amount of indicator and the effect of coexisting ions are investigated ; the experiment is further extended for the rapid estimation of Mo in ferromolybdenum by decomposing the sample with Nitric acid, heating with sulfuric acid at a temperature to give white fume for driving off the Nitric acid, adding HCl to approximately 6N and estimating the Mo by the above method. This method enables the estimation of Mo without separating the iron and the method can be carried out in 50-60minutes.