Chemo-Profiling of Illicit Amphetamine Tablets Seized from Jazan, Saudi Arabia, Using Gas Chromatography-Mass Spectrometry and Chemometric Techniques

Table 1

Results of precision and accuracy experiments for intra- and interday analysis of the three quality control samples using the proposed GC method.

	Concentrations of samples (μg/mL)	% RSD of peak area	% RSD of retention time	% recovery ± SD
Intraday analysis	5.0 (LQC)	0.75	0.92	99.4
	10.0 (MQC)	0.63	0.54	100.2
	20.0 (HQC)	0.94	0.88	98.5
Interday analysis	5.0 (LQC)	0.36	0.63	98.2
	10.0 (MQC)	0.57	0.49	98.6
	20.0 (HQC)	0.77	0.53	100.5

n = 3; LQC: low quality control, MQC: medium quality control, and HQC: high quality control.