Table 2.

The content of elements in the certified reference material: NIST-1577c Bovine Liver, NIST SRM 1548a, and TM 27.3 and validation parameters obtained during analysis.

Element	Certified reference material analysis		Validation parameters
	The result declared by the manufacturer	The result obtained in own research	LOD	LOQ	Precision (%)	Recovery (%)	Uncertainty (%)
Co (mg kg−1)	0.300a	0.295	0.002	0.004	2.42	92	17
Ag (μg kg−1)	5.9a	5.7	0.002	0.004	2.36	98	8
Sn (mg kg−1)	17.2b	16.40	0.021	0.042	7.43	96	18
Sb (μg kg−1)	3.13a	3.28	0.023	0.079	1	104	7
Pb (μg kg−1)	62.8a	62.2	0.005	0.01	6.07	99	12
Hg (μg kg−1)	5.36a	5.21	0.0011	0.0015	3.80	90	24
Cd (μg kg−1)	97.0a	96.3	0.004	0.007	2.42	99	6
As (μg kg−1)	19.6a	20.4	0.004	0.009	3.18	101	7
Cr (μg kg−1)	53a	55.2	0.028	0.055	2.40	100	8
Mn (mg kg−1)	10.46a	10.12	0.01	0.10	1	99	18
Ni (μg kg−1)	44.5a	46.1	0.077	0.258	6.04	103	6
V (μg kg−1)	8.17a	7.95	0.040	0.134	0.76	99	14
U (μg kg−1)	2.03c	2.5	0.039	0.131	0.89	100	19

^aNIST-1577c Bovine Liver, ^bNIST SRM 1548a, ^cTM 27.3.