導電率に基づく非電解質計による酒類及び清酒もろみ中のエタノール濃度測定

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タイトル別名
  • Determination of nonelectrolyte in aqueous solution by measurement of electric conductivity. II. Determination of ethanol in alcoholic drinks and in fermentation mixture by an automatic nonelectrolyte analyzer.
  • 導電率法による水溶液中の非電解質濃度測定法の研究　ＩＩ　　導電率に基づく非電解質計による酒類及び清酒もろみ中のエタノール濃度測定
  • ドウデンリツ ニ キズク ヒ デンカイシツケイ ニ ヨル サケルイ オヨビ セ
  • Determination of nonelectrolyte in aqueous solution by measurement of electric conductivity : II.
  • 導電率法による水溶液中の非電解質濃度測定法の研究(第2報)

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As reported in the previous paper, the nonelectrolyte in water can be determined by measuring the increase in electric conductivity of the sample to which a constant of a salt is added. The analyzer based on this principle was applied for determining ethanol in alcoholic drinks. The application to spirituous liquors was successful by calibrating the analyzer using the same kind of liquor. An application to brewage, however, was caused considerable error due to the influence of coexisting nonvolatile components (e.g. glucose). This problem has been solved by the correction using equations (1) and (2).<BR>C=C'-KE…(1)<BR>where C : ethanol concentration (v/v%) of alcoholic drink; C': indication of the analyzer; E : content (g/100 cm3) of coexisting nonvolatile components; K: influence coefficient.<BR>The relation between E and specific gravity is empirically known as<BR>E=(S-A) × 260+0.21…(2)<BR>where S : specific gravity(15/15 °C) of alcoholic drink ; A: specific gravity(15/15 °C) of ethanol-water mixed solution, whose ethanol concentration is equal to that of alcoholic drink. The procedure of measurement with correction consists of three steps. I. Calibration : the analyzer is calibrated by using two standard ethanol-water solutions. II. Determination of K-value : from a known sample K is calculated from eqs.(1) and (2). III. Determination of ethanol : measuring C' and S, C is obtained from eqs.(1) and (2). Using this correction, the concentration of ethanol (15.0%, 16.0%)-glucose (0240 g/l) mixed solution (9 samples) was determined. K-value used in the calculation was the one obtained with ethanol 16.0%-glucose 24 g/100 ml solution. The error was ± 0.2% or less. The filtrates of brewing process liquid of sake, 158 samples, were also measured. The error was ±0.3% or less for 134 samples. This correcting method is useful for determination of ethanol not only in spirituous liquors, but also in brewage and fermentation process liquids.

収録刊行物

  • 分析化学

    分析化学 36 (9), 537-541, 1987

    公益社団法人 日本分析化学会

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