交流ポーラログラフ法によるセメント中の微量亜鉛の定量

概要

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Small amounts of zinc in cement was determined by A. C. polarographic method. The procedure estabished is as follows. A sample is dissolved in hydrochloric acid with ammonium chloride, and silica, being made insoluble, is filtered off. Zinc in the filtrate is extracted in benzene as dithizonate, followed by stripping into phosphoric acid solution. The resulting solution is adjusted to 1.0M as phosphoric acid. The dissolved oxygen in an aliquot taken is removed completely by passing N2 gas, and A. C. polarogram is obtained between -1.0 to -1.5 volt against Hg pool, and the amount of zinc is obtained from the calibration curve. As little as 0.001% zinc in cement was deter. mined with satisfactory results, and about 0.010.1% of zinc was found in the commercial products.
社団法人日本分析化学会の論文