メンブランフィルターによるモリブドヒ酸-マラカイトグリーン会合体の捕集を利用した微量ヒ化水素の濃縮と吸光光度定量(<特集>超微量分析のための前処理と予備濃縮)

概要

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A simple method for the determination of trace amount of arsenic trihydride in gas phase was proposed. Arsenic trihydride was absorbed in sodium hypobromite and oxidized to arsenate. Molybdoarsenate-Malachite Green aggregate formed by Mo-MG reagent (mixed solution of ammonium molybdate and Malachite Green) was selectively collected on a nitrocellulose membrane filter (3 μm pore size). The aggregate was dissolved in a small volume of methylcellosolve together with the membrane filter. The absorbance (λ : 627 nm) was proportional to the amount of arsenic trihydride. The molar absorptivity of aggregate in methylcellosolve is 2.6×10^5 M^<-1> cm^<-1>. The method was applied to the determination of arsenic trihydride at 10 ng level in gas phase.
社団法人日本分析化学会の論文
1987-11-05