Thiothenoyltrifluoroacetoneによる銀の吸光光度定量

概要

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Silver is quantitatively extracted by shaking with thiothenoyltrifluoroacetone (STTA) solution in carbon tetrachloride from an aqueous solution containing pyridine at pH 6.8±0.1. The silver complex extracted is stable and has an absorption maximum at around 420 nm against a reagent blank. Beer's law holds over the range of 2.5-35 μg of silver/10 ml of organic phase. The molar absorptivity is 5800. The sensitivity is 0.019 μg Ag/cm^2 for an absorbance of 0.001. The coefficient of variation in precision is 1.9% for 30 μg of silver. The effect of various kinds of co-existing ions was examined. Copper, cobalt, lead, zinc, nickel, mercury, manganese, cadmium, aluminum, iron, gold, sulfide, and cyanide interfere in the determination but the permissible amount of these interfering ions except gold, mercury, sulfide, and cyanide can be increased by adding EDTA solution as a masking agent.
公益社団法人日本薬学会の論文
1973-10-25