Two New Reference Materials Based on Tobacco Leaves: Certification for over a Dozen of Toxic and Essential Elements

Table 3

Certified values for INCT-OBTL-5 (𝑋±𝑈).

(a) Major and minor elements

Element	Concentration (wt%)
Al	0.198±0.028
Ca	3.996±0.142
K	2.271±0.076
Mg	0.853±0.034
P	0.170±0.012
S	0.455±0.091

(b) Trace elements (1–1000 mg kg⁻¹)

Element	Concentration (mg kg^−1)
B	33.6±2.2
Ba	67.4±3.8
Br^a	87.4±5.4
Cd	2.64±0.14
Ce	2.99±0.18
Cu	10.1±0.4
La	1.69±0.09
Mn	180±6
Nd	1.33±0.11
Ni	8.50±0.49
Pb	2.01±0.31
Rb	19.1±1.0
Sr	105±5
V	4.12±0.55
Zn	52.4±1.8

(c) Trace elements (below 1 mg kg⁻¹)

Element	Concentration (ng g^−1)
Ag	53.0±10.5
As	668±86
Co	981±67
Cs	288±20
Er^a	101±6
Eu	60.2±4.1
Hf^a	291±24
Hg	20.9±1.3
Mo	414±62
Sb	75.5±12.5
Sc^a	640±27
Sm	264±13
Ta^a	41.7±3.8
Tb	34.7±2.3
Th	503±43
Yb	115±23

^aCertified on the basis of results by single analytical method.