1,10-フェナントロリンとテトラヨードフルオレセインを用いるマンガンの抽出吸光光度定量

概要

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In the presence of largE amount of l,lO-phenanthroiine(phen), the ion-pair of mangancse(II)_phen complex with tetraiodofluorescein(TIF) is quantitatively extracted into ethyl acetate from ammonium buffer solution, while the ion-pairs of other metal(II)-phen complexes are not quantitatively extracted at the same condition. This extraction method was applied to the spectrophotometric determination of manganese. The recommended procedure is as follows: to a solution containing up to l×lO^<-7> moles of manganese (II) in a separatory funnel, 1 ml of O.l M phen solution, 1 ml of lx1O^<-3> M TIF solution and 2 ml of ammonium buffer solution(pH 9.5) are added, and the solution is diluted to lO ml with water. After 5 min, the solution is shaken with 10 ml of ethyl acetate for 7 min, After centrifuge, the absorbance of organic phase is measurcd at 544 nm against the reagent blank. Beer's low is held up to 1×10^<-7> moles of manganese in the lO ml ethyl acetate phase. The extracted complex has a composition of [Mn(II)-(phen)_2](TIF), and its molar absorptivity at 544 nm is 1.05×10^5 dm^3 mol^<-1> cm^<-1>.
社団法人日本分析化学会の論文
1983-04-05