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Table 2 Selectivity coefficients of the coated graphite constructed sensors

From: New pencil graphite electrodes for potentiometric determination of fexofenadine hydrochloride and montelukast sodium in their pure, synthetic mixtures, and combined dosage form

Interfering B Sensor 1 (FEX.mol) Sensor 2 (MON. co) The combined sensor
FEX MON
K Fex,B K Mon,B K Fex,B K Mon,B
CaCl2 4.9*10–3 3.2*10–2 4.9*10–3 3.4*10–2
KCl 1.3*10–3 4.6*10–3 1.7*10–3 4.6*10–3
NH4Cl 6.1*10–3 2.1*10–2 6.8*10–3 2.3*10–2
NaCl 1.3*10–3 3.0*10–3 1.5*10–3 3.5*10–3
dextrose 7.4*10–3 6.1*10–3 7.7*10–3 6.4*10–3
Mg stearate 2.4*10–3 8.7*10–3 2.7*10–3 8.9*10–3
Avicel 6.5*10–3 5.5*10–3 6.7*10–3 5.6*10–3
FEX 3.8*10–3 4.2*10–3
MON 5.5*10–2 5.6*10–2