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Large amplitude sinusoidal voltammetry

  • US 5,650,061 A
  • Filed: 09/18/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 09/18/1995
  • Status: Expired due to Term
First Claim
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1. A method for making a fast electrochemical analysis in a voltammetric flow injection system of a small volume of analyte having at least one redox species of interest with a formal potential included within a potential window, the method comprising:

  • providing a small amount of said analyte in a flow to a voltammetric electrode;

    applying a sinusoidal voltage characterized by a fundamental frequency to said electrode, said sinusoidal voltage having an amplitude large enough to sweep through said formal potential of said redox species of interest of said analyte in a single cycle at said fundamental frequency to generate a voltammetric response of said analyte to said sinusoidal voltage in a time domain; and

    generating a Fourier transform of said voltammetric response of said analyte to said sinusoidal voltage in said time domain to provide a spectrum of said voltammetric response in a frequency domain;

    selectively quantifying said voltammetric response of said analyte to said sinusoidal voltage in said frequency domain at a harmonic of said fundamental frequency of said sinusoidal voltage rather than at said fundamental frequency without inversely transforming said voltammetric response back to said time domain to provide a quantitative analysis of said analyte,whereby a complete frequency spectrum is obtained within one cycle of said sinusoidal voltage.

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