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Apparatus and method for testing liquids

  • US 4,844,097 A
  • Filed: 02/09/1987
  • Issued: 07/04/1989
  • Est. Priority Date: 05/21/1985
  • Status: Expired due to Fees
First Claim
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1. Apparatus for testing the concentration of a selected atomic scale species in a thick liquid, the apparatus comprising a first chamber which contains, in use, a thick liquid under test, the chamber being at least partly defined by one face of a microporous dialysis membrane which is permeable to atomic scale species;

  • and a measuring cell incorporating a second chamber which is arranged to be filled with a clean liquid and which is at least partly defined by an opposite face of the membrane whereby atomic scale species in the thick liquid under test diffuse through the membrane and are present in a clean liquid in a concentration related to that at which they exist in a thick liquid under test;

    the cell also incorporating a sensing device having an active surface which is responsive substantially only to a selected species and which comprises an electrod in communication with the clean liquid in the second chamber, said electrode being coated with a material which is permeable substantially only to a selected ionic species whereby the device provides an output related to the concentration of a selected species.

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