Table 2.
The precision1), accuracy2) and recovery for the analysis of 9 types minerals in CRM 1849a.

Compounds	Weight (g/50 ml)	RSD (%)		Recovery (%)
		Intra-day (n=3)	Inter-day (n=12)
		Sodium	0.08		1.67	3.24	93.81±2.44
0.25	0.84		2.45	95.97±2.22
1.0	0.48		7.76	96.97±8.11
Calcium	0.08	0.67	3.02	100.07±2.99
	0.25	0.30	1.19	103.44±0.57
	1.0	0.71	1.90	105.51±1.44
Potassium	0.08	1.11	2.34	90.36±1.58
	0.25	0.51	2.01	93.01±1.94
	1.0	0.09	1.64	100.20±1.77
Phosphorus	0.08	1.77	3.00	95.75±2.22
	0.25	0.40	1.43	100.71±0.96
	1.0	0.77	3.23	110.63±3.39
Magesium	0.08	0.75	5.16	93.15±4.85
	0.25	0.66	1.79	96.64±1.42
	1.0	0.97	2.43	98.94±2.13
Iron	0.08	2.74	2.93	101.70±1.28
	0.25	0.37	1.86	97.25±1.89
	1.0	0.59	3.32	103.10±3.63
Zinc	0.08	2.88	3.35	90.76±1.89
	0.25	0.40	1.77	91.12±1.65
	1.0	0.28	2.95	97.34±2.79
Copper	0.08	4.80	10.43	92.76±6.25
	0.25	0.41	5.50	90.35±1.70
	1.0	0.42	2.04	90.39±1.88
Manganese	0.08	3.36	18.19	101.49±9.32
	0.25	0.15	4.41	94.68±3.48
	1.0	0.52	5.95	104.58±6.84

Amount of CRM-1849a : values represent the results of the intra-day (n=3) and inter-day (n=12) analyses
Values represent the mean of the intra-day (n=3) and inter-day (n=12) analyses±SD