溶媒抽出/黒鉛炉原子吸光法によるマンガン団塊中の微量の白金の定量

概要

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A rapid and precise method for the determination of Pt in manganese nodules and crusts is presented. The sample of 0.1g was decomposed with 8ml of aqua regia and filtered. The filtrate was evaporated to dryness, then dissolved in 20ml of 20% tartaric acid with heating. After the addition of 0.5ml iron (III) chloride solution (20mg Fe/ml) and 0.5ml of 1% 1, 3-diphenylthiourea in acetone, the mixture was heated for 5min at about 100℃. The solution was extracted with 1ml of 1, 2-dichloroethane for 5min. Platinum in the organic phase was determined by graphite furnace AAS. The limit of detection is 0.05ppm, and the relative standard deviation in the determination of 0.01μg to 1.0μg of Pt is 4 to 16%. The method is satisfactorily applied to USGS manganese nodule reference samples and the manganese nodules and crusts collected from the Central Pacific Ocean, Antarctic Ocean and Ogasawara Plateau.
社団法人日本分析化学会の論文
1987-08-05