アルカリ工業原料および製品中の微量の銅の定量法
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A method has been described for the ionexchange and photometric determination of microgram quantities of copper in alkali industry.<BR>Sample of the alkali products such as soda ash and caustic soda was acidified with 12<I>N</I> HCl and the pH value was adjusted to 35. This solution was passed through the Dowex A-1 resin column at the rate of about 6 m<I>l</I> per min. Copper was then eluted from the column with 2<I>N</I> HCl and the effluents were gathered in a separatory funnel, to which were added 10 m<I>l</I> of the combined reducing reagent (NH<SUB>2</SUB>OH·HCl+Na-citrate) and NH<SUB>4</SUB>OH to adjust the pH 46. 5m<I>l</I> of 0.1% neocuproine were added and the resulted brownish complex was extracted with exactly 10 m<I>l</I> of CHCl<SUB>3</SUB>. The absorbancy was measured with a spectrophotometer at 460 mμ.<BR>Copper in alkali products was determined accurately by this method, the time required for a determination being about four hours.
- 社団法人 日本分析化学会の論文
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- アルカリ工業原料および製品中の微量の銅の定量法