Table 6
Measurement of cer tified reference material (CRM) according to different migrant solution at 100°C for 30 min

Element	Migrant solution	Certified		Measured		Recovery (%)	RSD (%)3)
		Average (μg/mL)1)	Uncertainty (%)	Average (μg/mL)	SD2)
			Distilled water					0.302	0.004	100.1	1.38
Pb	Citric acid solution (0.5%)	0.302	0.466	0.306	0.003	101.2	1.05
	NaCl solution (1%)			0.303	0.005	100.3	1.75
	Distilled water			0.393	0.008	101.0	2.08
As	Citric acid solution (0.5%)	0.389	0.574	0.393	0.002	101.1	0.39
	NaCl solution (1%)			0.402	0.004	103.3	1.12
	Distilled water			0.751	0.004	101.0	0.50
Cd	Citric acid solution (0.5%)	0.743	0.460	0.755	0.006	101.7	0.73
	NaCl solution (1%)			0.756	0.010	101.7	1.33
	Distilled water			1.198	0.003	104.1	0.26
Ni	Citric acid solution (0.5%)	1.150	0.458	1.213	0.002	105.4	0.17
	NaCl solution (1%)			1.207	0.012	105.0	0.99
	Distilled water			1.833	0.020	93.5	1.10
Al	Citric acid solution (0.5%)	1.960	4.980	1.847	0.013	94.2	0.72
	NaCl solution (1%)			1.865	0.011	95.1	0.59

Average values obtained from three measurement.
Standard deviation.
Standard deviation/Average value×100.