金属フタロシアニンの選択溶解性を利用するカドミウム金属中の極微量銅の分離と原子吸光定量

概要

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A 25-mg to 50-mg cadmium metal sample containing less than 2 μg of copper is dissolved in nitric and hydrochloric acids. The solution is evaporated to dryness. Phthalocyanine complexes are then formed by heating with 114 mg of phthalonitrile and 0.8 ml of quinoline at 280 ℃. The resulting complexes are treated with 10 ml of 3.6 M sulfuric acid to selectively dissolve the cadmium complex. The residue, after washing with water, is decomposed with 0.75 ml of 18 M sulfuric acid, 0.75 ml of 13 M nitric acid and 1 ml of 30 % hydrogen peroxide, and the solution evaporated to dryness. The residue is then dissolved in 250 μl to 500 μl of 0.1 M hydrochloric acid, and a 100-μl aliquot is transferred into a Teflon microcup for atomic absorption spectrometry. A few ppm of copper in cadmium can be determined in 5 h with an error of ca. 10%.
社団法人日本分析化学会の論文
1983-06-05