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Cation-selective polymeric electrodes

  • US 5,395,505 A
  • Filed: 04/28/1994
  • Issued: 03/07/1995
  • Est. Priority Date: 10/31/1991
  • Status: Expired due to Term
First Claim
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1. A cation-sensitive electrode which comprises an internal reference electrode, an internal reference solution and a cation-responsive membrane, characterized in that the internal reference solution contains a saturated solution of a salt of a cation other than the cation for which the cation-responsive membrane is primarily selective, the internal reference solution is formed in situ by hydration of a combination of a hygroscopic material with the salt of the cation other than the cation for which the cation-responsive membrane is primarily selective, either by absorption of water from the atmosphere and/or by hydration of the hygroscopic material when the electrode is put into use, thereby forming the internal reference solution.

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