Table 2.

Intraday and interday precision and accuracy for the determination of ERD in bulk form using the proposed methods.

Method		Nominal concentration (μg/mL)	Mean ± SDa (μg/mL)	RSD%b	Er%c
KMnO4 (Method I)	Intraday	2	2.01 ± 0.02	1.00	0.50
		4	3.97 ± 0.06	1.51	−0.75
		6	5.98 ± 0.03	0.50	−0.33
	Interday	2	2.03 ± 0.02	0.99	1.50
		4	3.94 ± 0.03	0.76	−1.50
		6	5.96 ± 0.05	0.84	−0.67
Ce4+ Spectrophotometry (Method II)	Intraday	0.5	0.508 ± 0.005	0.98	1.60
		0.75	0.750 ± 0.014	1.87	0.00
		1	1.02 ± 0.014	1.37	2.00
	Interday	0.5	0.506 ± 0.003	0.59	1.20
		0.75	0.749 ± 0.006	0.80	−0.13
		1	1.000 ± 0.016	1.60	0.00
Ce4+ Spectrofluorimetry (Method III)	Intraday	0.025	0.0254 ± 0.0004	1.58	1.60
		0.05	0.0505 ± 0.0006	1.19	1.00
		0.075	0.076 ± 0.0008	1.05	1.33
	Interday	0.025	0.0251 ± 0.0003	1.20	0.40
		0.05	0.0508 ± 0.0003	0.59	1.60
		0.075	0.075 ± 0.001	1.33	0.00
Acriflavine(Method IV)	Intraday	20	20.1 ± 0.34	1.69	0.50
		40	40.4 ± 0.68	1.68	1.00
		60	60.1 ± 0.02	0.03	0.17
	Interday	20	20.4 ± 0.30	1.47	2.00
		40	40.1 ± 0.86	2.14	0.25
		60	60.4 ± 0.24	0.40	0.67

^aMean ± SD for three determinations. ^b% Relative standard deviation. ^c% Relative error.