Table 4.

Precision data for the assessment of the studied drugs by the proposed method.

amount taken (μg ml−1)	% found	% RSD	% error
OLS
intra-day; 2.0	99.23 ± 0.36	0.36	0.21
4.0	100.11 ± 0.51	0.51	0.29
6.0	99.75 ± 0.23	0.23	0.13
inter-day; 2.0	100.35 ± 0.96	0.96	0.55
4.0	99.77 ± 1.02	1.02	0.59
6.0	101.35 ± 1.12	1.11	0.64
SUL
intra-day; 4.0	99.65 ± 0.45	0.45	0.26
6.0	100.42 ± 0.62	0.62	0.36
8.0	99.66 ± 0.80	0.80	0.46
inter-day; 4.0	98.54 ± 1.10	1.12	0.64
6.0	99.63 ± 0.82	0.82	0.48
8.0	100.98 ± 1.08	1.07	0.62