アルカリ性におけるフェノールフタレインの吸光光度定量条件の検討

概要

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Following conditions were studied in order to improve a decolorization of phenolphthalein in alkaline media: species, concentration and pH of buffer solution, standing temperature and time, foreign compounds, etc. As a result, the following standard procedure was chosen for the determination of phenolphthalein: fifty mg of phenolphthalein is dissolved in 100ml of ethanol and the solution diluted with ethanol to yield (50〜500)μg/5ml of the sample. Five ml of the sample solution is taken being evaporated to dryness on water bath. The residue is dissolved in 0.1M carbonate buffer (pH 10.6) to give exactly 50ml, and then the absorbance at 555nm is immediately measured at 20℃ (reference: the buffer solution). 0.1M carbonate buffer (pH 10.6) gave better result than 0.1M glycine buffer (pH 11.3) and 0.1M phosphate buffer (pH 11.3) which have been widely used.
社団法人日本分析化学会の論文
1978-08-05