Thiothenoyltrifluoroacetoneと1,10-Phenanthrolineによる銀の吸光光度定量

概要

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Silver is quantitatively extracted from an aqueous solution by shaking with thiothenoyltrifluoroacetone (STTA) solution in xylene in the presence of 1,10-phenanthroline at pH 4.3-6.0,and the excess STTA in organic phase is removed by shaking with borate buffer (pH 11.5). Silver is determined by measuring the absorbance of the complex extracted at 360 nm against the reagent blank. The calibration curve follows Beer's law over the range of 2-45 μg of silver in 10 ml of the organic phase. The molar absorptivity is 16200 at 360 nm. The sensitivity is 0.0067 μg Ag/cm^2 for the absorbance of 0.001. The coefficient of variation in precision is 1.2% for 30 μg of silver. The molar ratio of silver, STTA and 1,10-phenanthroline in the extracted species is estimated to be 1 : 1 : 1 by the continuous variation method. The method described herein is more sensitive than the known method, ^<3)> and the selectivity can be improved by the addition of ethylenediaminetetraacetic acid.
公益社団法人日本薬学会の論文
1975-08-25