連続水素化物生成-原子吸光法による地質試料中微量セレンの定量

概要

論文の詳細を見る
A hydride generation-atomic absorption method for the rapid and precise determination of selenium in geological materials is described. The rock and soil samples of O.1〜0.5g were decomposed with HC1O_4, HNO_3, and HF, then evaporated nearly to dryness. The residue was dissolved by diluted HG1, and added iron (III) (25 mg) chloride solution, and then diluted to 25 ml with water. For coals, O.O5〜0.1g of sample was digested with HC1 and HNO_3 at 130℃ for 5 h, and then also digested with HF. Selenium hydride was generated with 1 % sodium tetrahydroborate and 6 M hydrochloric acid using an automated hydride generator, and introduced to a quartz cell atomizer. Most serious interferences occur from copper, nickel, arsenic, and tin, but the interferences were eliminated by the addition of iron(III). For high ash coal sample, slightly lower selenium values were observed in the procedure of the low temperature oxygen plasma ashing. The detection limit is 0.01 ppm for 0.5 g of a given sample, and the relative standard deviation in the determination of more than 0.1 ppm is less than 12 %. The method is satisfactorily applied to the analyses of selenium in geological reference rock, soil, and coal samples.
社団法人日本分析化学会の論文
1984-05-05