Determination of trace manganese in tantalum and niobium metals by a combination of ion exchange and kinetic method

FUKASAWA Tsutomu, YAMANE Takeshi

doi:10.2116/bunsekikagaku.24.120

A simple and sensitive method has been developed for the determination of trace amounts of manganese in tantalum and niobium metals.<BR>The method is based on the separation and concentration of manganese by ion exchange adsorption on cation exchange resin from HF-HNO₃ media followed by the kinetic determination of manganese.<BR>Sample was dissolved in 5 ml of HF(1+1) and 2 ml of HNO₃(1+1) in a polyethylene beaker with gentle heating, and the solution was diluted to about 50 ml with water. This sample solution was passed through an ion exchange column {Amberlite CG-120, H-form, (100200)mesh, 10 mm in diam. × 50 mm} at the flow rate(12)ml/min. The column was washed with 30 ml of wash solution {mixture of 5 ml of HF(1+1) and 2ml of HNO₃(1+1) was diluted with water to about 50 ml}, then with 20 ml of water. The adsorbed manganese was eluted with 15 ml of HCl(1+1). The effluent containing manganese was collected in a glass beaker and evaporated to moist dryness without baking. The residue was dissolved in water and transfered to a 50 ml volumetric flask. A 10 ml aliquot of this solution was taken into a test tube with a ground glass stopper.<BR>Then manganese was determined by the kinetic method described in previous paper51. The proposed method allows the determination of manganese as low as 0.05 ppm for 1-gram sample.

Determination of trace manganese in tantalum and niobium metals by a combination of ion exchange and kinetic method

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