Table 3. Determination of certified materials of vegetables (n = 6, fresh weight).

	GBW10015 Spinach			GBW10014 Cabbage
	Certified mg/kg	Measured mg/kg	Recovery (%)	Certified mg/kg	Measured mg/kg	Recovery (%)
As	0.23 ± 0.03	0.20 ± 0.02	91.3	0.062 ± 0.014	0.06 ± 0.012	96.8
Cd	0.15 ± 0.025	0.16 ± 0.029	106.7	0.035 ± 0.006	0.034 ± 0.008	97.1
Cr	1.4 ± 0.2	1.2 ± 0.3	92.9	1.8 ± 0.3	1.7 ± 0.4	94.4
Hg	0.02  ±  0.003	0.02 ± 0.004	100.0	0.011 ± 0.002	0.010 ± 0.003	90.9
Ni	0.92 ± 0.12	0.94 ± 0.11	102.2	0.93 ± 0.10	0.95 ± 0.08	102.2
Pb	11.1 ± 0.9	11.4 ± 0.8	102.7	0.19 ± 0.03	0.18 ± 0.04	94.7