原子吸光分析法による酸化鉄中の微量鉛の定量

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In the atomic absorption spectrometric determination of microamounts of lead in oxides of iron by the aid of an organic solvent extraction method, the substitution of DHEG by TEA for masking agent of ferric ion was also useful, and conpensation of emission from background was unnecessary. An improved procedure has been presented for the determination of microamounts of lead in oxides of iron by using an instrument of high sensitivity. The solution was prepared as follows : 0.70 g of sample was dissolved in 9 ml of hydrochloric acid and 3 ml of nitric acid. The solution was evaporated to about 1 ml, and, after cooling, 20 ml of 7N hydrochloric acid was added. It was shaken in a separatory funnel with 30 ml of MIBK. The aqueous layer was evaporated to about 1 ml, and made up to 10 ml with 2N hydrochloric acid. This method is recommendable for 0.0010.010% of lead in oxides of iron. It is more rapid than the previous method reported by the authors, and the coefficient of variation was about 3%.
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