Stability-Indicating Assay for the Determination of Pentobarbital Sodium in Liquid Formulations

Table 4

Precision study of the method.

Nominal conc. (g/mL)	Intraday precision			Interday precision
	Calculated conc.; (g/mL), mean ± SD	Accuracy; (%bias)	RSD	Calculated conc.; (g/mL), mean ± SD	Accuracy; (%bias)	RSD
8	8.273 ± 0.009	3.42	0.11	8.181 ± 0.103	2.27	1.25
15	15.280 ± 0.143	1.86	0.94	15.052 ± 0.208	0.35	1.38
30	30.748 ± 0.632	2.49	2.06	30.355 ± 0.386	1.18	1.27
80	81.738 ± 0.602	2.17	0.74	81.257 ± 1,218	1.57	1.50
150	153.569 ± 0.328	2.38	0.21	152,278 ± 2,139	1.52	1.41