Investigation of Acid-Base Indicator Property of Plumbagin from Plumbago zeylanica Linn

Table 8

Different analysts on the same experimental day for evaluation of robustness.

HCl/NaOH (mL)		CH3COOH/NaOH (mL)		Assay of pure ibuprofen powder (% purity)		Assay of ibuprofen BP tablets (% content)
Analyst 1	Analyst 2	Analyst 1	Analyst 2	Analyst 1	Analyst 2	Analyst 1	Analyst 2
10.18	10.09	11.00	10.82	98.80	99.90	96.14	99.11
10.18	9.99	11.08	11.05	99.30	100.40	95.98	98.80
10.18	10.09	11.08	10.93	98.80	100.40	98.50	98.70
10.27	10.09	11.08	11.05	99.80	99.90	98.30	97.98
10.09	10.18	11.00	11.05	99.30	100.40	96.00	98.50
10.09	9.99	10.90	11.05	99.80	100.90	97.10	99.30
Mean = 10.17 ± 0.028	Mean = 10.07 ± 0.029	Mean = 11.02 ± 0.029	Mean = 10.99 ± 0.040	Mean = 99.30 ± 0.183	Mean = 100.3 ± 0.376	Mean = 97.00 ± 0.474	Mean = 98.73 ± 0.191
RSD = 0.67%	RSD = 0.72%	RSD = 0.65%	RSD = 0.88%	RSD = 0.45%	RSD = 0.38%	RSD = 1.20%	RSD = 0.47%