アルゴン-水素フレーム原子吸光法によるケイ酸塩中の微量スズの定量

概要

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A method is proposed for the detemination of tin in silicates by atomic absorption spectrometry after extracting tin(IV) iodide with benzene. Take 0.1 to 0.5g of sample in a platinum dish, add 10ml of HF, 5ml of HC1O_4,and 3ml of HNO_3,and evaporate the solution to dryness. Dissolve the residue by heating with 5ml of HC1 (1+1). Transfer the solution into a separatoty funnel, add 10ml of HC1O_4, 0.5ml of 50% sodium hypophosphite, 5ml of 5M NaI, and extract tin for 3 min with 10ml of benzene. Wash the organic phase with 16ml of 5.5M HC1O_4- 0.3M NaI solution. Shake the organic phase for 3 min with 10ml of 0.6M HCl-0,004M MgCl_2, and withdraw the aqueous phase into a beaker. Cover the beaker, immerse in boiling water for about 15 min to remove the dissolved benzene, and introduce this solution into a premix type slot burner. The sensitivity is 0.02μg/ml/1% abs., and the limit of detection 0.4ppm of tin in rock samples. The relative standard deviation in the determination of 2 to 100μg tin is 2 to 9%. The time required for 10 samples is abot 4 hours. The method is satisfactorily applled to the standard siliacate samples.
社団法人日本分析化学会の論文
1975-05-10