フルフラールを用いるアセトンの比色定量法の改良

概要

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Potassium cyanide is used in the conventional mcthod for determination of acetone with furfural, and the poisonous cyanide gas is generated by adding sulfuric acid to produce the color. Potassium cyanide was found to be unnecessary in the method when decreased ammount of furfural was used in comparison with the conventional method for acetone. The recommended procedure is as follows. Take a sample solution of 5ml {containing (2〜25)μg acetone}. Add 1ml of 10w/v% sodium hydroxide solution, and 0.5ml of furfural solution which is prepared by dissolving 1.0ml of furfuralin 10ml of ethanol and then diluting the mixture with water to 100ml. Swirl the mixture, and keep it at room temperature for 60 minutes. Add 7ml of 2:1 sulfuric acid. After standing for 20 minutes, measure the absorbance at 520nm against the reagent blank. The sensitivity of the method increases about ten-fold in comparison with that of the salicylaldehyde method, and simplifies the analytical procedure because heating procedure is not necessary. Oxidative reagents and reductive reagents interfere with the determination of acetone. Methylethylketone interferes seriously with the method.
社団法人日本分析化学会の論文
1978-04-05