クロモトロープ酸による金属タンタル中のチタンの吸光光度定量法
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概要
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The experiment deals with the determination of titanium in tantalum by chromotoropic acid method. Chromotoropic acid is dissolved in a sodium sulfitesolution to overcome instability under light. The final spectrophotometric determination is carried at pH 1.0to avoid interferences by diverse ions.<BR>The proposed procedure is as follows. The metallic tantalum is changed to oxide by ignition, then fused with potassium pyrosulfate, and the melt is dissolved in a hot ammonium oxalate solution. The solution is cooled and diluted to about 70m<I>l</I>. Five m<I>l</I> of chromotoropic acid solution (made by dissolving 5g chromotoropic acid in 100m<I>l</I> of 5% sodium sulfite solution) is added. Then the pH of the solution is adjusted to 1.0±0.1. The solution is diluted to 100m<I>l</I>, and the absorbance at 480mμ is measured.<BR>The lower limit of determination by this method is 20ppm of titanium in metallic tantalum.
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