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Cyclic voltammetric method for the measurement of concentrations of subcomponents of plating solution additive mixtures

  • US 5,192,403 A
  • Filed: 05/16/1991
  • Issued: 03/09/1993
  • Est. Priority Date: 05/16/1991
  • Status: Expired due to Fees
First Claim
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1. A cyclic voltammetric method for measuring concentrations of subcomponents of additive mixtures, comprising the steps of:

  • (a) preparing a basis solution which contains all of the components of an unknown solution to be measured, except a component of interest;

    (b) preparing a calibration solution which contains said component of interest in a known concentration near that which would be expected in said unknown solution;

    (c) adding measured amounts of said calibration solution to a first defined volume of said basis solution;

    (d) applying an electrical potential to an electrode in the mixed calibration/basis solution and plotting the calibration cathodic charge against the added volume of the calibration solution;

    (e) adding measured amounts of said unknown solution to a second volume of said basis solution;

    (f) applying an electrical potential to an electrode in the mixed unknown/basis solution and plotting the cathodic charge against the added volume of the unknown solution; and

    (g) comparing the slopes of the calibration and unknown cathodic charge versus volume curves to determine the concentration of said component of interest in said unknown solution.

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