Table 2. Validation factors and monitoring test for vitamin B₁₂ in certified reference material (SRM 1849a)

	Tested value (μg/kg)	RSD (%)		Recovery (%)
SRM 1849a	54.10±0.84	1.88		112.24±2.11
Samples	Tested value (μg/kg)
Cereal infant formula	T-1	T-2	T-3	T-4
	11.93±2.08	11.03±0.16	42.18±1.57	16.65±1.18
r2	0.999	Linear regression		y=53.806x–150.44
LOD	2.71 μg/L	Range		25–500 μg/L
LOQ	8.21 μg/L

All values are mean±SD of three replicates.
RSD, relative standard deviation; LOD, limit of detection; LOQ, limit of quantitation.