Measurement of Magnesium, Zinc, and Copper in Human Serum by Using Isotope Dilution Inductively Coupled Plasma Mass Spectrometry (ID ICP-MS)

Table 3

Analysis of standard reference material by two-way ID ICP-MS.

		Mg (mg·kg^−1)				Zn (mg·kg^−1)		Cu (mg·kg^−1)
		NIST956d			GBW	ERM	GBW	ERM	GBW
		Level 1	Level 2	Level 3	09152	-DA120a	09152	-DA120a	09152
Day 1	Test 1	34.98	22.91	10.49	20.59	0.649	1.156	1.126	1.064
	Test 2	34.84	22.70	10.38	20.54	0.664	1.148	1.131	1.069
	Test 3	34.60	22.72	10.41	20.61	0.660	1.140	1.126	1.073
Day 2	Test 1	35.08	22.51	10.37	20.56	0.653	1.140	1.145	1.082
	Test 2	34.60	22.95	10.43	20.63	0.652	1.156	1.140	1.077
	Test 3	34.66	22.83	10.51	20.52	0.650	1.144	1.143	1.080
Day 3	Test 1	34.74	22.59	10.36	20.50	0.665	1.147	1.131	1.069
	Test 2	34.67	22.66	10.25	20.60	0.658	1.137	1.130	1.067
	Test 3	35.04	22.73	10.28	20.56	0.651	1.156	1.135	1.072
Avg		34.80	22.73	10.39	20.57	0.656	1.147	1.13	1.072
cv		0.5%	0.6%	0.8%	0.2%	0.9%	0.7%	0.6%	0.6%
Certified values		34.96 ± 0.24	22.83 ± 0.16	10.30 ± 0.08	20.75 ± 0.44	0.658 ± 0.033	1.132 ± 0.056	1.130 ± 0.033	1.085 ± 0.044
Bias (%)		0.46%	0.42%	−0.84%	0.88%	0.33%	−1.35%	−0.37%	1.15%