Research Article

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

Table 5

Certified values for INCT-PVTL-6 ( 𝑋 ± 𝑈 ).
(a) Major and minor elements

ElementConcentration (wt%)

Ca 2 . 2 9 7 ± 0 . 0 7 8
K 2 . 6 4 0 ± 0 . 0 9 0
Mg 0 . 2 4 1 ± 0 . 0 0 9
P 0 . 2 4 2 ± 0 . 0 1 5
S 0 . 3 7 8 ± 0 . 0 5 9

(b) Trace elements (1–1000 mg kg−1)

ElementConcentration (mg kg−1)

Al 2 5 2 ± 4 9
B 3 3 . 4 ± 1 . 9
Ba 4 1 . 6 ± 1 . 9
Bra 1 9 . 5 ± 1 . 0
Cd 2 . 2 3 ± 0 . 1 2
Cu 5 . 1 2 ± 0 . 2 0
Li 3 . 3 5 ± 0 . 6 7
Mn 1 3 6 ± 5
Ni 1 . 4 9 ± 0 . 1 4
Rb 5 . 9 7 ± 0 . 2 8
Sr 1 3 3 ± 6
Zn 4 3 . 6 ± 1 . 4

(c) Trace elements (below 1 mg kg−1)

ElementConcentration (ng g−1)

Ag 1 9 . 1 ± 3 . 8
As 1 3 8 ± 1 0
Ce 7 4 3 ± 5 1
Co 1 5 4 ± 7
Era 1 8 . 5 ± 3 . 2
Eu 1 4 . 0 ± 2 . 6
Hg 2 3 . 2 ± 1 . 6
Hfa 1 6 1 ± 8
La 5 4 0 ± 2 7
Mo 3 9 6 ± 2 9
Nd 3 2 2 ± 2 4
Pb 9 7 2 ± 1 4 7
Sb 3 7 . 2 ± 3 . 9
Sca 5 9 . 5 ± 3 . 4
Sm 5 8 . 0 ± 4 . 3
Taa 1 0 . 9 ± 1 . 2
Tb 8 . 1 ± 1 . 0
Th 8 8 . 8 ± 6 . 8
V 4 0 5 ± 5 6

aCertified on the basis of results by single analytical method.