Serum calcium and potassium determination by the split membrane ion-selective electrode technique

Talanta. 1978 Sep;25(9):541-3. doi: 10.1016/0039-9140(78)80095-2.


Results are presented for the determination by differential potentiometry of calcium and potassium in human and sheep sera, by use of a flow-through cell. The split-membrane ion-selective electrode technique has been used in conjunction with polymer membrane electrodes of the coated-wire type and the type containing an aqueous inner reference solution. The electroactive reagent is di(n-octylphenyl)phosphoric acid for calcium and valinomycin for potassium.