. 2016 Apr 2;174(1):240–250. doi: 10.1007/s12011-016-0669-4

Table 3.

Measurements of bioelements and toxic metal concentrations in reference materials, i.e., Tea NCS ZC73014, Oriental Basma Tobacco Leaves INCT-OBTL-5, and Polish Virginia Tobacco Leaves INCT-PVTL-6

Element	Certified concentration (mg/100 g)	Concentration determined (mg/100 g)	RSD (%)	Recovery (%)
Ca^a Ca^b Ca^c Co^a Co^b Cu^a Cu^b Cu^c Cd^b Cd^c Cr^a Cr^b Cr^c Mg^a Mg^b Mg^c Mn^a Mn^b Mn^c Zn^a Zn^b Zn^c K^a K^b K^c Na^a Na^c Pb^a Pb^b Pb^c P^a P^b P^c Ni^a Ni^b Ni^c Fe^a Fe^b Fe^c	3260 ± 80 3859 ± 142 2297 ± 78 0.22 ± 0.02 0.10 ± 0.007 18.6 ± 0.7 1.01 ± 0.04 0.51 ± 0.02 0.26 ± 0.01 0.22 ± 0.01 0.45 ± 0.1 0.63^d 0.09^d 1860 ± 110 853 ± 34 241 ± 9 500 ± 2 18.0 ± 0.6 13.6 ± 0.5 51.0 ± 2 5.24 ± 0.18 4.36 ± 0.1 16,300 ± 700 2271 ± 76 2640 ± 90 90 ± 10 6.24^d 1.5 ± 0.2 0.20 ± 0.03 0.10 ± 0.01 4500 ± 0.3 170 ± 12 242 ± 5 3.4 ± 0.3 0.85 ± 0.05 0.15 ± 0.01 242 ± 18 149^d 25.8^d	2818 ± 123 3566 ± 149 2513 ± 13.4 0.21 ± 0.03 0.09 ± 0.005 16.9 ± 0.02 1.00 ± 0.01 0.54 ± 0.01 0.28 ± 0.01 0.21 ± 0.001 0.44 ± 0.02 0.56 ± 0.0001 0.09 ± 0.001 1785 ± 28.8 845 ± 4.96 247 ± 6.01 460 ± 4 20.2 ± 0.34 15.3 ± 0.18 50.9 ± 0.26 5.59 ± 0.24 4.64 ± 0.01 16,713 ± 800 2449 ± 50.3 2692 ± 31.6 88 ± 9 5.50 ± 0.03 1.41 ± 0.03 0.19 ± 0.01 0.09 ± 0.01 4650 ± 0.5 170 ± 0.41 239 ± 0.96 3.2 ± 0.02 0.80 ± 0.078 0.13 ± 0.001 244 ± 14 160 ± 1.01 28 ± 0.30	4.38 4.17 0.5 10.3 5.65 0.12 1.42 2.0 3.48 0.4 4.54 0.02 1.3 1.61 0.59 2.4 0.87 1.67 1.2 0.51 4.31 0.3 4.79 2.06 1.2 10.2 0.5 2.13 5.6 10.3 0.11 0.24 0.4 0.62 9.8 0.6 5.74 0.63 1.1	86 92 109 95 90 91 99 106 105 95 98 89 98 96 99 102 92 112 113 100 107 106 102 108 102 98 88 94 95 89 103 100 99 94 94 87 101 107 109

^aTea NCS ZC73014

^bOriental Basma Tobacco Leaves INCT-OBTL-5

^cPolish Virginia Tobacco Leaves INCT-PVTL-6

^dInformation value