カプリコート抽出を併用した1-(2-ピリジルアゾ)-2-ナフトールによるカドミウム(II)の吸光光度定量

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The procedure for the determination of cadmium(II) in the presence of large amounts of zinc(II) is as follows : Take a sample solution containing 0〜100μg of cadmium(II) in a separately funnel. After the addition of 10ml of 10% thiourea solution and 5ml of 20% potassium iodide solution, adjust the pH to 5.8 by adding 5ml of 5% urotropine solution. The resulting volume should be ca. 50ml. Add 20.0ml of 5% Capriquat in chloroform, and then shake the mixture for 3 min. Transfer the organic phase to another separatory funnel, and repeat the extraction with 20.0ml of the Capriquat solution. Wash the aqueous phase with 10.0ml of pure chloroform. Combine the extracts and back-extract zinc(II) twice with 20ml of 10% potassium nitrate solution, then add 5ml of 0.1% 1-(2-pyridylazo)-2-naphthol in methanol, 10ml of 10% ammonium nitrate solution and allow the phases to separate. Measure the absorbance of the organic phase at 555nm against a reagent blank. The calibration curve was linear over the concentration range of 0〜100μg cadmium(II)/50ml, the Sandell sensitivity being 0.0044μg/cm^2. The effect of diversions was also investigated. Almost all metal ions did not interfere with the determination. The present method was applied to the determination of trace amount of cadmium in high purity metallic zinc.
社団法人日本分析化学会の論文
1978-07-05