Construction of microcomputer-controlled polarograph and its data-processing system

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  • WASA Tamotsu
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
  • YAMAMOTO Hiroshi
    Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture

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Other Title
  • マイクロコンピューター制御型ポーラログラフの試作とデータ処理システムの開発
  • マイクロコンピュータ セイギョガタ ポーラログラフ ノ シサク ト データ シ

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Abstract

A microcomputer-controlled polarograph by using two microcomputers (MEK D II, Motorola and H68/TR, Hitachi) and its data-processing system by using inexpensive electronic devices have been constructed, and programs for the system control and data processing have been developed. The selection of analytical modes (Tast, Normal pulse, Differential pulse polarography, Stripping voltammetry, etc.) and measurements were carried out by using the program control of MEK D II and the electrochemical data (i and E) were accumulated on the memory of the computer. A microcomputer, H68/TR connected to MEK D II was used for the data processing by BASIC language. After digital filtering of the data transferred from MEK D II, polarographic waves were detected. by comparing the slopes of the i-E curve. The approximate values of id, and E1/2 were estimated by using the linear least-squares fitting with the same manner to manual treatment. These values were then utilized for the rigorous calculation of id, E1/2, and S (slope of the log plot) by means of least-squares fitting with Heyrovský-Ilkovic equation. The relative error of this data processing for artificial polarograms generated by the theoretical equation was less than ±0.1 %. The results of the computer treatment for Tast and Normal pulse polarography were in good agreement with values obtained by manual treatment. The overall precision of the system for the determination of metal ions (Pb2+, Cd2+, Zn2+, etc.) was within ±2 % for id and E1/2, and ±5 % for S. The execution time was about 3 min for the processing of three-step polarogram.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 31 (8), T55-T60, 1982

    The Japan Society for Analytical Chemistry

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