銅(II)-チオテノイルトリフルオロアセトン錯体を用いた硫化物イオンの間接吸光光度定量

概要

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Copper(II) complex of thiothenoyltrifluoroacetone (STTA) is decomposed by sulfide ion in alkaline aqueous solution, and copper(II) is liberated from the complexas sulfide. The fact was applied for the determination of sulfide ion, and the conditions for the determination were investigated. A sample solution containing (1.0〜7-5)μg of sulfide ion was taken into a 100ml separatory funnel, and 10ml of borate buffer solution was added to adjust the pH of the solution to 10〜11. The final volume was made up to 50ml with water and 10ml of copper(II)-STTA complex solution in xylene which contained 15μg of (copper(II) per 10ml was added. After shaking the funnel for 1 min, the aqueous phase was removed and the absorbance of the organic phase containing undecomposed copper(II) STTA complex was measured at 400nm against xylene. The calibration curve was linear over the range of (1.0〜7.5)μg of sulfide ion, and the sensitivity was 9.7×10^<-4>μg S/cm^2 for the absorbance of 0.001. The coefficient of variation for 1.05 and 5.14μg of sulfide ion was 1.37 and 1.11%, respectively. No interference in determination of 5μg of sulfide ion was observed for 1mg of Cl^-, Br^-, I^-, F^-, SCN^-, BrO_3^-, NO_2^-, NO_3^-, SO_3^<2->, S_2O_3^<2-> and PO_4^<3-> and 0.5mg of CIO_3^-. However, IO_3^-, and CN^- interfered even when the amounts were 5 and 0.5μg respectively.
社団法人日本分析化学会の論文
1978-08-05