Potentiometric Determination of Ketotifen Fumarate in Pharmaceutical Preparations and Urine Using Carbon Paste and PVC Membrane Selective Electrodes

Table 1

Potentiometric selectivity coefficient of CPE (DOS) and PVC (DOS) membrane electrodes.

Interfering ions (B)	log𝐾^pot𝐷,𝐵
	SSM		Matched method
	CPE	PVC	CPE	PVC
Glucose	—	—	3.95	2.20
Lactose	—	—	3.90	4.13
Fructose	—	—	2.85	1.60
Maltose	—	—	3.65	0.35
Starch	—	—	2.50	1.50
Sucrose	—	—	4.00	1.10
Glycine	—	—	2.30	1.15
Ca^2+	1.30	1.70	—	—
Ni^2+	1.70	1.20	—	—
Co^2+	2.40	0.60	—	—
Cd^2+	2.50	0.90	—	—
Na^+	3.00	1.09	—	—