酸化テルル(IV)中の微量元素の固液抽出分離(ノート)

概要

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A technique has been developed for preconcentrating trace elements in high-purity tellurium metal. One gram of metal sample was placed in a 50-ml beaker, and dissolved in 20ml of 7 M nitric acid. To the solution was added 1ml of 0.1 M nitric acid containing 1μg each of cobalt, zinc or cadmium labelled with cobalt-60, zinc-65 or cadmium-115 m, respectively. The solution was evaporated to dryness, and the resulting solid (TeO2) was roughly triturated with a glass rod. Four milliliters of one of the solvents as described below were added to the beaker, which was put into water in a 35-1 cleaning tank, and ultrasonics (29 kHz, 150W) was applied to effect vigorous stirring. After 10 min, the contents of the beaker were filtered trough a glass fibre filter paper, which was then washed with 1 ml of the solvent, and the gamma activity of the combined filtrate and washings was measured with a well-type NaI (T1) scintillation counter. All the desired trace elements were extracted in more than 95% yields with water, 0.1 M nitric acid, 0.1 M hydrochloric acid, 1 M phosphoric acid and ethanol-12 M hydrochloric acid (99 : 1). Concentration factors of the trace elements with respect to tellurium matrix were (0.081) × 104. The time required for a separation was approximately 1.5 hrs.
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