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

Table 6

Results of recovery study via standard addition method with tablet.

Method	Tablet studied	KTF in tablet; mg/µg mL^−1	Pure KTF added; mg/µg mL^−1	Total found; mg/µg mL^−1	Pure KTF*; Percent ± SD
A	Ketasma-1	6.03	3.0	9.24	102.3 ± 1.98
		6.03	6.0	12.22	101.6 ± 1.25
		6.03	9.0	15.29	101.3 ± 2.08
B	Ketasma-1	3.03	1.5	4.54	101.1 ± 1.26
		3.03	3.0	6.09	102.1 ± 1.98
		3.03	4.5	7.59	101.4 ± 1.34
C	Ketasma-1	2.05	1.0	3.06	101. 1 ± 1.63
		2.05	2.0	4.03	99.36 ± 1.28
		2.05	3.0	5.12	102.4 ± 1.53

∗mg in method A; µg mL⁻¹ in methods B and C. ∗Mean value of three determinations.