Redox-Reaction Based Spectrophotometric Assay of Isoniazid in Pharmaceuticals

Table 2

Evaluation of intraday and interday accuracy and precision.

Method	INH; Taken; (µg mL^−1)	Intraday accuracy and precision (𝑛=7)			Interday accuracy and precision (𝑛=5)
		INH; Found^a; (µg mL^−1)	RSD^b; %	RE^c; %	INH; found; (µg mL^−1)	RSD^b; %	RE^c; %
A	3.0	2.96	1.24	0.89	3.07	2.34	2.12
	6.0	6.11	1.84	1.03	6.12	2.00	2.53
	9.0	9.14	1.56	1.52	9.15	1.67	2.00
B	1.0	1.01	1.02	1.92	1.03	3.00	1.85
	1.5	1.47	2.01	1.15	1.54	2.67	1.27
	2.0	2.04	1.92	1.47	2.05	2.50	1.62

aMean value of 7 determinations; ^brelative standard deviation (%); ^crelative error (%).