Table 1. Accuracy, precision, correlation coefficient, limit of detection (LOD), and limit of quantification (LOQ) of mineral and hazardous heavy metal analysis by atomic absorption spectrophotometer (AAS) and inductively coupled plasma mass spectrometer (ICP/MS)

Instrument	Mineral	Accuracy (%)	Precision (RSD%)	Correlation coefficient (R2)	LOD (mg/kg)	LOQ (mg/kg)
AAS	Na	97.40	0.03	0.9954	0.1945	0.5894
	Mg	95.40	0.01	0.9984	0.1586	0.4807
	K	109.40	0.02	1.0000	0.2394	0.7255
	Ca	94.60	0.03	0.9990	0.7920	2.4000
ICP/MS	Cr	98.46	2.30	0.9999	0.0098	0.0296
	Cu	98.34	1.40	1.0000	0.0090	0.0274
	Cd*	101.20	2.00	1.0000	0.0004	0.0014
	Pb*	99.90	0.60	0.9993	0.5000	1.6000

The unit of LOD and LOQ is μg/kg.