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

Table 3

Determination of ketotifen fumarate in pure solutions and pharmaceutical preparations using CPE and PVC sensors.

		CPE				PVC
Taken (mg)		Direct method		Standard addition method		Direct method		Standard addition method
		Recovery %	RSD %	Recovery %	RSD %	Recovery %	RSD %	Recovery %	RSD %
Pure KTF	4.255	98.93	0.74	98.54	1.77	98.50	0.80	99.02	2.25
	12.77	97.97	0.97	97.89	1.54	98.07	1.46	98.56	1.35
	21.28	98.96	1.14	99.02	0.99	99.18	1.42	97.86	1.87
	29.79	97.83	1.73	99.42	0.83	98.79	1.36	98.22	1.76
Zaditen tablet; (1 mg/tablet)	4.26	98.90	0.98	99.00	1.65	97.48	2.08	99.16	1.64