Thiothenoyltrifluoroacetoneによる銀の吸光光度定量法の改良

概要

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Silver [I] is quantitatively extracted by shaking with thiothenoyltrifluoroacetone (STTA) solution in xylene from an aqueous solution containing pyridine at pH 6.8±0.1. In order to eliminate the excess amount of STTA which reduces sensitivity of the existing method, ^<3)> the organic phase is washed with a basic washing solution (9 ml of pH 11.5 borax-NaOH buffer solution + 1 ml of pyridine) and silver is determined by measuring the absorbance at 360 nm against the reagent blank. This improved method has higher sensitivity (molar absorptivity, 12600) compared to the earlier method^<3)> (molar absorptivity, 5800), and the calibration curve follows Beer's law over the range of 3-30 μg of silver/10 ml of organic phase. The coefficient of variation in precision is 0.8% for 20 μg of silver. The molar ratio of silver [I] to STTA in extracted complex is estimated to be 1 to 1. Good results were obtained for recovery tests of silver on synthetic samples (copper + silver).
公益社団法人日本薬学会の論文
1974-08-25