チオテノイルトリフルオロアセトンを用いる銅の溶媒抽出-原子吸光分析

概要

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Copper was quantitatively extracted by shaking with thiothenoyltrifluoroacetone(STTA) solution in xylene from an aqueous solution at Ph 3.0〜8.0. The resulting organic phase could be used for the atomic absorption spectrophotometry. A sample solution containing up to 10μg of copper was taken into a 100 ml separating funnel, and 5 ml of 0.5 M acetate buffer solution was added to adjust the pH of the solution to 4.7. The final volume was made up to 50 ml with water and 10 ml of 1.0×10^<-3>M STTA solution in xylene was added. After shaking the vessel for 3 minutes, the organic phase was introduced into air-acetylene flame and the absorbance was measured at 3247.5Å against the reagent blank. The calibration curve obtained was linear for 0〜10μg of copper in 10 ml of the organic phase. The coefficient of variation of the absorbance for 2 and 10μg of copper was 2.4 and 1.3%, respectively. No interference in determination of 10μg of copper was observed for 1 mg of cadmium(II), manganese(II), nickel(II), lead(II), zink(II), palladium(II), aluminum(III), iron(III), gold(III), 500μg of silver(I), mercury(II), and 100μg of cobalt(II). The proposed method was sensitive and selective, and good results were obtained for recovery tests of copper in artificial sea water and well water.
1977-07-05