Development of H+-Selective Electrode with a Cation Exchanger Membrane and Its Application to a Control Chemical Analysis of a Pickling Solution Containing Nitric and Hydrofluoric Acids

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  • INOKUMA Yasuo
    Central Research Laboratories, Sumitomo Metal Industries, Ltd.
  • OCHIAI Takashi
    Central Research Laboratories, Sumitomo Metal Industries, Ltd.
  • ENDO Jyo
    Central Research Laboratories, Sumitomo Metal Industries, Ltd.
  • HIIRO Kazuo
    Govenment Industrial Research Institute, Osaka

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Other Title
  • 陽イオン交換膜型水素イオン電極の開発と硝フッ酸酸洗浴の管理分析への応用
  • ヨウイオン コウカン マクガタ スイソ イオン デンキョク ノ カイハツ ト
  • 陽イオン交換膜型水素イオン電極の開発と硝ふっ酸酸洗浴の管理分析への応用

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Description

A method concerning ion-selective electrodes was studied for the direct determination of a concentration of H+ or HF in a pickling solution of stainless steel containing HNO3, HF, and metal ions. Strongly acidic cation exchanger membrane was the most suitable one as an electroactive substance for a H+-selective electrode to measure H+ concentration in a test solution. The interference of HF and cationic metal ions could be suppressed and lowered the general measuring error occur red in an ion-meter by diluting 50-100 times (in volume) a pickling solution with 0.05 N HNO3 solution. The concentration of H+ or HF in a test solution taken from a pickling solution was determined directly in terms of the following equations by measuring the potential between a H+-selective electrode and a reference electrode or a F--selective electrode:<BR>EH=EH0+RT/F1n[H+] and EHF=EHF0+RT/F1n[HF]<BR>The concentrations of H+ and HF in a pickling solution were determined from these values by using the calibration curves. By the present method, 0.1-2.0 mol/l of H+ and 0.9-3.2mol/l of HF in a pickling solution could be determined, and the standard deviations between these and those obtained by the conventional methods were 0.06 mol/l and O.05 mol/l for H+and HF, respectively, in the presence of 0-0.5 mol/l of Fe3+, 0-0.1 mol/lof Cr3+, and 00.08 mol/l of Ni2+. The present method is simple, needs no special reagent, and is useful for a control chemical analysis of pickling solutions containing HNO3, HF, and metal ions.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1980 (10), 1469-1474, 1980-10-10

    The Chemical Society of Japan

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