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

Table 4

Determination of KTF in spiked human urine using CPE and PVC membrane electrodes.

Sample	Statistical parameters	CPE			PVC
		Direct method	Calibration graphs	Standard addition method	Direct method	Calibration graphs	Standard addition method
Human urine	Mean recovery (%)	98.43	98.28	97.89	98.73	98.09	98.17
	𝑁	4	4	4	4	4	4
	Variance	0.847	0.748	0.657	0.454	0.607	0.439
	SD	0.752	0.455	0.768	0.859	0.559	0.947
	SE	0.398	0.695	0.836	0.693	0.465	0.551
	RSD (%)	0.849	0.479	0.790	0.906	0.573	0.994