FIELD: potentiometric measurements of concentration of ions in solutions. SUBSTANCE: proposed comparison pH electrode includes body, electrolyte, ion-conductive membrane separating electrolyte and tested medium placed in body and sensitive element put into electrolyte. Electrolyte in this case is prepared in the form of crystalline hydrate of NH4Ca(NO3)3•nH2O produced by exchange reaction of Ca(OH)2 with saturated solution NH4NO3. EFFECT: improved authenticity of measurements with proposed electrode. 2 cl, 1 dwg
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