原子吸光法による地質標準物質 50 種中のビスマスの定量

概要

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A simple and sensitive method by AAS using either a combination of hydride generation and quartz cell (HG-QC) atomizer or solvent extraction and graphite furnace (SE-GF) atomizer has been investigated for the determination of Bi in a great variety geological reference materials. Their advantages were considered. A sample of 0.1 to 0.5 g was decomposed with HNO_3, HClO_4 and HF, and dissolved by heating with diluted HCl. After the addition of ascorbic acid and thiourea, bismuth hydride was generated with 1% sodium tetrahydroborate and 2 M HCl using an automated hydride generator. The method of SE-GFAAS was adopted for samples with low Bi contents. The samples were decomposed by the above-mentioned method, and Bi was extracted as the iodide into 1 ml of n-butyl acetate from a 0.9 M HClO_4-0.003 M NaI solution containing ascorbic acid and Au as a matrix modifier. The limit of detection was 5 ng g^-1 by HG-QCAAS, and 0.8 ng g^-1 by SE-GFAAS for 0.5 g test potions. This method was successfully applied to the determination of Bi in 50 international geological reference materials.
社団法人日本分析化学会の論文
2002-05-05