Abstract

High-performance coated-wire ion-selective electrodes based on dodecylmethyl bis(12-crown-4) and bis(benzo-15-crown-5) are used for the simultaneous determination of Na+ and K+ in human urine or serum by means of the Gran's plot method. The results of the potentiometric determination for Na+ and K+ in human urine or serum are in good agreement with the values obtained by flame photometry.

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