Evaluation of intra-day and inter-day precisions of the proposed method.

Conc. (μg mL−1)	Intra-day precision	Inter-day precision
	% recovery ± SDa	% recovery ± SDa
0.3	101.64 ± 1.26	101.52 ± 1.25
0.9	100.29 ± 1.96	100.12 ± 1.32
1.6	100.85 ± 1.31	99.69 ± 1.55

^aMean of three determinations, SD, standard deviation.