Spectrophotometric Estimation of Nitrazepam in Pure and in Pharmaceutical Preparations

Table 2

Evaluation of intraday and interday accuracy and precision results.

Method	NTZ taken, μg/mL	Intraday^a			Interday^b
		NTZ found^c, μg/mL	Precision^d	Accuracy^e	NTZ found^c, μg/mL	Precision^d	Accuracy^e
A	5	4.96±0.04	0.78	0.77	4.94±0.02	0.39	1.19
	10	9.89±0.04	0.39	1.11	10.08±0.05	0.50	−0.78
	15	14.81±0.09	0.66	1.28	15.10±0.07	0.43	−0.68
B	4	4.02±0.023	0.58	−0.46	4.18±0.04	1.01	−4.45
	8	7.92±0.042	0.53	0.22	7.95±0.03	0.33	0.68
	12	12.00±0.10	0.79	−0.04	11.83±0.05	0.45	1.46
C	2	1.99±0.02	0.96	0.37	2.054±0.01	0.07	−2.72
	6	6.00±0.05	0.79	−0.06	5.92±0.03	0.47	1.37
	10	10.03±0.05	0.47	−0.25	9.93±0.03	0.27	0.69

aMean value of five determinations, ^bmean value of five determinations, ^cmean value of three determinations, ^drelative standard deviation (%), ^ebias%: (found − taken/taken) × 100.