Table 3. The LOD and LOQ of minerals, and accuracy of mineral contents for SRM 1869 (Infant/Adult Nutritional Formula II)

Component	LOD (μg/100 g)1)	LOQ (μg/100 g)2)	Reference value (mg/kg)3)	Analysis value (mg/kg)4)	Recovery (%)	RSD (%)5)
Na	2.84	9.47	1,877±53	1,860.07±26.85	99.1±1.4	1.4
Ca	2.63	8.77	4,560±130	4,641.41±62.72	101.8±1.4	1.4
K	1.43	4.75	7,560±110	7,554.27±43.09	99.9±0.6	0.6
P	1.01	3.35	4,186±57	4,235.11±4.74	101.2±0.1	0.1
Mg	3.36	1.12	947±10	942.89±3.98	99.6±0.4	0.4
Fe	0.30	1.00	164.7±3.7	166.33±1.25	101.0±0.8	0.8
Mn	0.12	0.39	46.0±1.6	44.93±0.34	97.7±0.7	0.8
Zn	0.35	1.16	144.0±3.2	142.25±1.50	98.8±1.0	1.1
Cu	0.37	1.24	19.00±0.38	4.93±0.02	101.0±0.4	0.4
Se	0.20	0.67	0.806±0.083	0.85±0.02	105.0±2.3	2.2
Mo	0.06	0.20	1.612±0.047	1.64±0.01	101.5±0.7	0.7
I	0.01	0.02	1.28±0.15	1.31±0.01	102.2±1.0	1.0
Cr	0.52	1.74	0.859±0.066	0.86±0.03	100.4±3.4	3.4

LOD, limit of detection.
LOQ, limit of quantitation.
Reference value indicates the mineral contents of SRM 1869 provided by NIST as the certificate value.
The values are mean±SD of 3 replications.
RSD, relative standard deviation.