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2- (2-Thiazolylazo)-4-methylphenol (TAC) reacts sensitively with iron (II) to form a waterinsoluble brown complex which can be extracted by many organic solvents. The complex extracted with chloroform is stable for 24 h and shows the characteristic absorption maxima at 527, 628 and 762 nm. The optimum pH for iron extraction lies between 4.8∼10.0 and the calibration curve obeys the Beer's law over the range from 0 to 50 μg/10 ml of iron at 762 nm. The molar absorption coefficient and the sensitivity are 1.37×10<SUP>4</SUP>l⋅mol<SUP>-1</SUP>⋅cm<SUP>-1</SUP>and 4.08 ng Fecm<SUP>-2</SUP> for log(Io/I) =0.001, respectively. The molar ratio of iron to TAC in the chelate is found to be 1: 2 and the logarithmic extraction constant is determined to be 2.70±0.22. As the present method utilizes the specific absorption of iron (II) complex, the presence of many ions can be tolerated. It was applied to the determination of traces of iron dissolved in river water and synthetic mixtures with a satisfactory result. The method for the simultanious determination of iron and nickel was also proposed.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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