Titrimetric and Spectrophotometric Methods for the Assay of Ketotifen Using Cerium(IV) and Two Reagents

Table 3

Results of intraday and interday accuracy and precision study.

Method	KTF taken; mg/µg mL^−1	Intraday accuracy and precision (𝑛=7)			Interday accuracy and precision (𝑛=7)
		KTF found; mg/µg mL^−1	RE %	RSD %	KTF found; mg/µg mL^−1	RE %	RSD %
A	5.00	5.06	1.20	1.80	5.12	2.42	2.90
	10.0	10.12	1.62	1.40	10.15	1.51	2.43
	15.0	14.80	1.34	0.94	14.72	1.58	1.92
B	2.0	2.02	1.23	1.72	2.03	1.62	1.18
	4.0	3.96	1.62	0.87	3.94	1.26	1.58
	6.0	6.08	1.33	1.46	6.17	1.90	0.88
C	4.0	3.94	0.73	1.43	3.95	1.14	2.12
	6.0	6.06	1.06	1.09	6.11	1.84	1.79
	8.0	7.90	1.21	1.18	7.88	1.47	1.09

In method A, KTF taken/found, is in mg and it is µg mL⁻¹ in method B and C.
RE: relative error (%); RSD: relative standard deviation (%).