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Reference solution for measuring ionic activity

  • US 4,865,698 A
  • Filed: 03/17/1987
  • Issued: 09/12/1989
  • Est. Priority Date: 03/17/1986
  • Status: Expired due to Term
First Claim
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1. A reference solution for measuring the activity of sodium ions, potassium ions or chloride ions in an aqueous solution by a differential method using ion-selective electrodes, said reference solution comprising (a) at least one compound having the general formula (I) ##STR7## wherein R1, R2, R3 and R4 represent a hydrogen atom or a lower alkyl group, respectively, and at least one of R3 and R4 is a lower alkyl group, and X represents a chlorine atom or a bromine atom and (b) at least one electrolyte selected from the group consisting of sodium chloride, ammonium chloride, ammonium nitrite, potassium chloride and lithium acetate.

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