トリブチールフォスフェート抽出による金属ニッケル中のセリウムおよびマンガンの光度定量

抄録

An examination was conducted of the conditions needed for the photometric determination by extracting and isolating Ce and Mn contained in metallic nickel by use of TBP (Tri-N-butyl-phosphate).
Ce in metallic nickel could be completely extracted and isolated by repeating the process of extraction and isolation twice by using TBP from the 8 N HNO₃ solution containing 5 mL, 2 M NaBrO₃ solution and 10 mL HClO₄.
By back-extracting this extraction phase by the 8 N HNO₃ solution containing 3% H₂O₂, the photometric determination of Ce could be successfully carried out at 320 mμ by the AgNO₃-K₂S₂O₈ method, while, similarly, the photometric determination of Mn could be undertaken at 530 mμ from the residual extraction solution by the AgNO₃-(NH₄)₂S₂O₈ method.
The range of determination of Ce by this method was 0.01∼0.30%, and such coexisting elements as Fe and Si, in metallic nickel were not generally seen to exert any influence.