MEMBRANE PH-SENSITIVE ELECTRODES BASED ON NEW NITROGEN-CONTAINING NEUTRAL CARRIERS

A series of new symmetrical and asymmetrical aliphatic tertiary amines and nicotinic acid derivatives synthesized as hydrogen ion carriers h ave been used for preparing solvent polymeric membrane (SPM) pH electr odes. The electrodes prepared have wide linear mV-pH response range, a nd can be used for determination of pH of human blood serum, preparati on of gas-sensing probes and end-point indication of acid-base titrati ons. The relationships between the structure of ionophores and electro de potential response characteristics were studied using quantum chemi stry calculations. Super-Nernstian response was explained by establish ment of a general membrane potential equation.