Spectrophotometric Simultaneous Determination of Salbutamol Sulfate and Ketotifen Fumarate in Combined Tablet Dosage Form by First-Order Derivative Spectroscopy Method

Table 2

Repeatability data for proposed method.

Sr. no.	Concentration (µg/mL)	Absorbance of salbutamol sulfate at 257 nm	Absorbance of ketotifen fumarate at 278 nm
1	10 ppm	0.00227	0.01004
2	10 ppm	0.00223	0.01001
3	10 ppm	0.00226	0.01003
4	10 ppm	0.00230	0.01001
5	10 ppm	0.00222	0.01007
6	10 ppm	0.00224	0.01005
	Mean	0.00225	0.01003
	SD	0.000029	0.0000234
	%RSD	1.30	0.23