タンタル処理黒鉛管を用いる原子吸光法によるガリウムの定量

概要

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Graphite atomizer tubes were treated with tantalum (Ta) in order to coat the surface of the tubes with tantalum carbide (TaC), and were used for the determination of gallium by AAS. The measurement conditions were optimized and the effects of diverse coexisting substances (metal cations, anions and organic compounds) were examined. By this treatment, the sensitivity increased by a factor over 5 along with an improvement in the repeatability. The calibration curve of Ga obtained by using a TaC-coated tube and a matrix modifier (250 mg dm ^<-3> Al + 500 mg dm ^<-3> Ni + 1 mol dm ^<-3> HNO_3) was linear over the range of 0〜300 μg dm ^<-3>, and the detection limit (3σ_0) was 10μg dm ^<-3> (0.10 ng). The present method was applied to analyses of rock standard materials.
社団法人日本分析化学会の論文
1997-11-05