Thiothenoyltrifluoroacetoneによる銅(II)の吸光光度定量法の改良

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概要

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• The excess of thiothenoyltrifluoroacetone (STTA) which reduces the sensitivity of the spectrophotometric determination of copper (II) with STTA can be removed by washing with alkaline solution without any decomposition of Cu (II)-STTA complex. The phenomenon was applied to improve the sensitivity of the determination of copper (II) with STTA. Copper (II) is quantitatively extracted from an aqueous solution by shaking with STTA solution in xylene at pH 3.7-8.5. After removal of the excess of STTA with borax-NaOH buffer solution (pH 11.5), absorbance of the organic phase is measured at 400 nm against the reagent blank. The calibration curve follows Beer's law over the range of 0-15 μg of copper (II) in 10 ml of the organic phase. The molar absorptivity at 400 nm is 4.3×10^4,and the sensitivity is 0.0015 μg Cu/cm^2 for the absorbance of 0.001. The coefficient of variation of the absorbance for 1,10,and 15 μg of copper (II) is 0.6,0.5,and 0.4%, respectively. The molar ratio of Cu (II) and STTA in the extracted species is estimated to be 1 : 2 by the continuous variation method. Many kinds of diverse ions do not interfere with this determination. However, mercury and sulfide interfere even when their amount is 1/5 times that of copper (II). The method proposed is sensitive and selective, and the sensitivity is better than that reported by Shinde, et al. and Deguchi, et al. using STTA. Good results were obtained for the recovery tests of copper (II) in artificial sea water and well water.

• 1977-04-30

著者

• 木下 武志

  広島大学工学部

• 上森 博夫

  広島県警犯罪科学研究所

関連論文

• Thiothenoyltrifluoroacetoneによる銅(II)の吸光光度定量法の改良
• 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
• ゼラチンとデキストラン硫酸ナトリウムからの高分子電解質錯体とその凝血形成

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