導電率法による水溶液中の非電解質濃度測定法の研究 I  基礎的検討と濃度計の試作:I. 基礎的検討と濃度計の試作  [in Japanese] Determination of nonelectrolytes in aqueous solution by conductivity measurement. I. Principle and construction of automatic analyzer.:I. Principle and construction of automatic analyzer  [in Japanese]

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Author(s)

Abstract

非電解質の水溶液に塩を添加していくとき,(1)導電率の増加が直線的であること,(2)非電解質の濃度が大きいほど,上記直線のこう配が小さいことから,校正用試料に一定の割合で塩を添加したときの導電率増加と濃度との関係を記憶させると共に,この間を直線で近似した濃度演算式に基づいて濃度を算出し,デジタル表示する計器を試作した.この計器を用いて,エタノール,エチレングリコールなど,又各種の糖の水溶液の測定試験を行った.1~35%の濃度に対し,測定誤差は大部分が絶対誤差で±0.3%以内であった.

The electric conductivity of electrolyte in ethanol solution is very low compared with that in water, and in ethanol-water solvent it has an intermediate value. The authors observed that the ethanol-water mixture became more conductive by adding an electrolyte, KCl in this case, with conductivity increase bearing a linear relation to the amount of added salt, and further observed that the higher the ethanol/water ratio, the smaller the conductivity increase coefficient. Other several nonelectrolytes show similar behavior. This suggests that the nonelectrolyte in solution can be simply determined by measuring the conductivity difference before and after the addition of a salt, and this method is applicable to conductive samples. An automatic noneletrolyte analyzer has been constructed, based on the principle above mentioned. The analyzer is microprocessor-based with a digital display. By using this analyzer the concentration of ethanol, ethylene glycol, glycerin, acetone, dimethylformamide, glucose, fructose, maltose and sucrose in aqueous solution were measured. The reproducibility was tested on the measurements of 16.0% ethanol in aqueous solution; the results were <I>x</I>=16.05, <I>R</I>=0.3, σ<SUB>x</SUB> =0.089, R.S.D. =0.55 (<I>n</I> = 22). Errors in measurements of the samples, concentration range of 135%, did not exceed ± 0.3% (absolute value) except one.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 36(8), 473-478, 1987

    The Japan Society for Analytical Chemistry

Codes

  • NII Article ID (NAID)
    110002909653
  • NII NACSIS-CAT ID (NCID)
    AN00222633
  • Text Lang
    JPN
  • ISSN
    0525-1931
  • NDL Article ID
    3143624
  • NDL Source Classification
    PA23(化学実験・分析化学--電気分析)
  • NDL Source Classification
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL Call No.
    Z17-9
  • Data Source
    NDL  NII-ELS  J-STAGE  NDL-Digital 
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