タングステンフィラメント電熱気化/誘導結合プラズマ質量分析法による微少量試料中のヒ素の定量

概要

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A combined method of electrothermal vaporization and ICP-MS was studied for microtrace analysis. A 5 μl volume of a sample was placed on a tungsten filament (0.2 mm in diam. ×45 mm) and desolvated electrothermally. Arsenic in the residue Was then vaporized by increasing the temperature of the filament to 2450℃ with the aid of a capacitor (0.22 F) and then carried in an argon stream to an ICP torch. The filament was used repeatedly at least 100 times. The relative standard deviation (n=10) for signal intensities of 15 pg As was ca. 10%, with an absolute detection limit (3σ) of 1 pg. The proposed method was applied to the determination of arsenic in a certified reference human hair sample. The analytical results obtained for the sample (decomposed with 14 M nitric acid and hydrogen peroxide) were 0.35±0.03 μg g^<-1>, which almost coincided with the certified values (0.31±0.02 μg g^<-1>).
社団法人日本分析化学会の論文
2000-02-05