銅,亜鉛,銀及びカドミウム地金中の微量鉄の沈殿分離 : けい光X線分析法による定量
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Copredpitation and X-ray fluorescence determination of iron in copper, zinc, silver, and cadmium metals. Kensaku KATO (Industrial Research Institute of Kanagawa Prefecture, 3173, Showamachi, Kanazawa-ku, Yokohama-shi, Kanagawa) Trace amount of iron (III) was quantitatively co-precipitated with titanium(IV) and chromium(III) hydroxides from aqueous solution of pH 7〜12. A linear calibration curve for the X-ray fluorescence determination was obtained over the range (0.1〜50) μg of iron. The coefficient of variation of the determination was 1.1% in five runs for 5 μg of iron and the sensitivity was 128 cps/μg Fe. The following amounts of foreign ions were tolerated in the determination of 5 μg of iron: Sb (V) 500 μg, Sn (IV) 200 μg, Bi (III) 100 μg, As (III) 50 jig, and Pb (II) 25 μg. The procedure is as follows: Dissolve 1 g of sample in 8 ml (for copper and zinc metals) or in 5 ml (for silver and cadmium metals) of 6.5 M nitric acid. Add 40 μg of titanium (IV) and 10 μg of chromium (III), dilute to about 30 ml with water, and then adjust the pH to 10 with ammonia. Collect the resulting precipitate on a membrane filter (25 mm, |0.2 μm) and wash with dilute ammonia (pH 10). After drying the precipitate at room temperature, measure the X-ray intensity of FeKa line (2θ = 57.52°) and that of background at an angle (2θ) 56.0°, in a vacuum for 40 s by using a tungsten-target tube (50 kV, 30 mA), a LiF(200) crystal and a scintillation counter. (Received July 12, 1980)
- 社団法人日本分析化学会の論文
- 1981-01-05
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