Table 2.

Repeatability of magnesium, zinc, and copper in human serum by ID ICP-MS.

		Mg (mg·kg−1)			Zn (mg·kg−1)			Cu (mg·kg−1)
		Level 1	Level 2	Level 3	Level 1	Level 2	Level 3	Level 1	Level 2
Day 1	1#	18.0	23.3	28.7	0.625	0.831	1.597	1.06	1.61
		18.0	23.3	28.7	0.627	0.834	1.583	1.06	1.62
		18.1	23.2	28.9	0.646	0.835	1.610	1.06	1.62
	2#	18.0	23.3	28.8	0.631	0.834	1.597	1.07	1.60
		18.0	23.3	28.8	0.627	0.825	1.594	1.06	1.62
		18.0	23.2	29.0	0.634	0.832	1.595	1.06	1.62
	3#	18.0	23.3	28.7	0.628	0.818	1.607	1.06	1.61
		18.0	23.3	28.7	0.634	0.819	1.599	1.06	1.63
		18.0	23.3	28.9	0.625	0.826	1.596	1.06	1.61
Day 2	4#	18.0	23.3	28.7	0.644	0.828	1.601	1.05	1.60
		18.0	23.2	28.7	0.634	0.827	1.606	1.05	1.60
		18.0	23.3	28.7	0.633	0.825	1.616	1.05	1.60
	5#	18.0	23.2	28.7	0.634	0.827	1.599	1.05	1.61
		18.0	23.3	28.7	0.632	0.830	1.596	1.06	1.60
		18.0	23.3	28.7	0.629	0.826	1.600	1.06	1.62
	6#	18.0	23.3	28.7	0.628	0.823	1.606	1.06	1.60
		18.0	23.2	28.7	0.633	0.830	1.591	1.06	1.59
		18.0	23.3	28.8	0.632	0.825	1.602	1.06	1.60
s		0.03	0.03	0.09	0.006	0.005	0.008	0.005	0.010
Avg		18.0	23.3	28.8	0.632	0.828	1.600	1.06	1.61
CV		0.2%	0.1%	0.3%	0.9%	0.6%	0.5%	0.4%	0.6%