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Measurement of polarographic current

  • US 3,957,592 A
  • Filed: 07/29/1974
  • Issued: 05/18/1976
  • Est. Priority Date: 07/29/1974
  • Status: Expired due to Term
First Claim
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1. In a polarographic cell of the type wherein the electrodes are continuously washed by a buffer solution, and wherein an electrical cell current is generated by the oxidation of hydrogen peroxide carried by the buffer solution past said electrodes, the improvement in measuring said cell current which comprises:

  • means for converting said cell current to an equivalent cell signal voltage;

    control means, connected to said cell signal voltage, for electronically generating a first signal when said cell signal voltage is below a pre-selected rate of change and a second signal when said cell signal voltage is above said pre-selected rate of change;

    means, connected to said cell signal voltage and said control means, for electronically holding and passing a constant voltage signal, equal in magnitude to the value of said cell signal voltage at the time said second signal is generated, in response to said second signal;

    peak detector means, connected to said cell signal voltage and said control means, for holding and passing as a constant voltage signal the maximum value reached by said cell signal voltage, said peak detector means being responsive to said second signal to release any previous peak value held therein; and

    subtraction means for electronically subtracting said voltage signal equal in magnitude to the value of said cell signal voltage at the time said second signal is generated from said voltage signal representing the maximum value reached by said cell signal voltage and furnishing a voltage signal equal to the difference thereof.

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