チオテノイルトリフルオロアセトンと1,10-フェナントロリンを用いるマンガン(II)の吸光光度定量

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Manganese(II) reacted with thiothenoyltrifluoroacetone(STTA) in the presence of 1,10-phenanthroline(phen) to form a complex, Mn (STTA)_2 (phen). The complex extracted into xylene had an absorption maximum around 375 nm and the absorbance was stable at least for 24 h. The analytical procedure was as follows: To a sample solution containing less than 15 *g of manganese(II), were added each 5ml of 20 w/v % ammonium acetate solution and 3.0 × 10^<-4>M phen solution. The pH of the mixture was adjusted to 7.3 ±0.3 with ammonia water and the solution was diluted to 50 ml with water. The manganese(II) in the solution was extracted with 10ml of 3.15 × 10^<-4>M STTA solution in xylene by shaking for 5 min. The aqueous phase was removed and the organic phase was washed with 10 ml of borax-NaOH buffer solution (pH 11.5) by shaking for 1min. Then the absorbance of the organic phase was measured at 375 nm against the reagent blank. In the determination of 10 *g of manganese(II), 1.0 *g of zinc(II), cadmium(II), copper(II), and cobalt(II) interfered. However, these (interfering) metal ions were removed by the preliminary extraction at pH 7.3±0.3 with STTA solution in xylene in the absence of phen, because manganese (II) was not extracted under these conditions. The calibration curve was linear up to 15 *g of manganese (II) in 10 ml of the organic phase. The coefficient of variation on the absorbance for 10 pg of manganese (II) was 0.8%. The molar absorptivity was 3.58 × 10^4 mol^<-1> cm^<-1>. The proposed method could be applied to the determination of manganese in aluminum and aluminum alloys with satisfactory results.
社団法人日本分析化学会の論文
1982-10-05

チオテノイルトリフルオロアセトンと1,10-フェナントロリンを用いるマンガン(II)の吸光光度定量

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