溶媒抽出分離 : 黒鉛炉原子吸光法による地質標準物質中のインジウムとテルルの定量

概要

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A simple and sensitive method for the determination of In and Te in geological reference materials is presented. A sample of 0.01 to 1.0 g, containing less than 50 μg of Bi, Pb, or Sn, and 100 μg of Cu, was decomposed with aqua regia and HF. The contents were then evaporated to dryness. The residue was dissolved by heating with diluted HCl, and centrifuged to remove any undissolved material. After the addition of sulphamic acid, potassium iodide-ascorbic acid, and palladium solutions to the supernatant, In and Te were extracted into 0.5 〜 1.0 ml of MIBK containing 5% trioctylmethylammonium chloride, and determined by graphite-furnace AAS. Although interference from most elements could be minimized by the addition of palladium as a matrix modifier, a large amount of Bi, Pb, Sn and Cu suppressed the In and/or Te absorbance. The relative standard deviation was smaller than 10% for a content larger than 3 ng of In and Te, and the limit of detection for both elements was 0.2 ng/g for a 1 g sample. This method was successfully applied to the determination of In and Te in various geological reference materials.
2000-10-05