加熱石英セル/水素化物発生/原子吸光法による陸水中のアンチモン(III)及びアンチモン(V)の分別定量

概要

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For the determination of total antimony, the operating conditions of a hydride generation system were investigated. The total antimony was determined by 2 M hydrochloric acid and a 1% (w/v) sodium tetrahydroborate solution in a 0.125 M sodium hydroxide solution after adding potassium iodide and conc. hydrochloric acid to a sample solution {ultimately : 5% (w/v) KI, 0.60 M HCl} and standing it for 15 min. The detection limit and precision of the method was 0.07 ppb (3 σ) and ±2.3%, respectively. For a differential determination between antimony(III) and antimony(V), the concentration of acidic solution was investigated. By using a 0.10 M hydrochloric acid solution, antimony(III) was separated from antimony(V). The detection limit and precision of a differential determination was 0.19ppb(3σ) and ±3.1%, respectively. The antimony(V) was determined by subtracting the concentration of antimony(III) from that of total anti- mony. The method was applied to the determination of antimony(III) and antimony(V) in a river-water sample and ground water samples from mines. Although antimony(III) was not detected in the samples, antimony(V) was detected in the range of 5.53〜 6.00 ppb in the mine ground-water samples.
社団法人日本分析化学会の論文
1997-10-05