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Flow-through electrochemical system analytical method

  • US 4,172,770 A
  • Filed: 03/27/1978
  • Issued: 10/30/1979
  • Est. Priority Date: 03/27/1978
  • Status: Expired due to Term
First Claim
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1. A method of determining the solution concentration in a sample liquid stream of an electroactive species in the presence of at least one interfering electroactive species comprising placing an electrode means adjacent a flow-through type reaction chamber;

  • subsequentlyseparating said electrode means from said reaction chamber by a membrane system comprising at least one layer of a membrane material which has pores therethrough which allow selective diffusion across said membrane system, said membrane material permitting diffusion therethrough of said at least one interfering electroactive species at a lower rate than said electroactive species;

    subsequentlyflowing a sample stream adjacent to said membrane system at a predetermined flow rate to allow diffusion of said electroactive species from said reaction chamber to said electrode means to the substantial exclusion of said at least one interfering electroactive species;

    monitoring the response of said electrode means; and

    flowing a buffer stream adjacent to said membrane to allow diffusion of said electroactive species and said at least one interfering electroactive species into said buffer stream preparatory to the flowing of a different sample liquid stream adjacent said membrane for determining the solution concentration of said electroactive species therein.

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