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

Table 2

Analytical results obtained for the candidate reference materials.

Element	Unit	Number of accepted laboratory averages		Overall mean of accepted laboratory averages
		INCT-OBTL-5	INCT-PVTL-6	INCT-OBTL-5	INCT-PVTL-6
Ag	ng g^−1	5	4	53.0^c1	19.1^c1
Al	mg kg^−1	20	18	1981^c2	252^c2
^241Am	Bq kg^−1		1		0.022
As	ng g^−1	19	19	668^c2	138^c2
Au	ng g^−1	6	2	2.97^i1	0.67
B	mg kg^−1	13	13	33.6^c1	33.4^c1
Ba	mg kg^−1	34	33	67.4^c2	41.6^c2
Be	ng g^−1	8	7	81.2^i1	31.0
Bi	ng g^−1	2	3	96.0	140^i1
Br	mg kg^−1	11	10	87.4^c2	19.5^c2
C	wt%	1	1	44.0	42.9
Ca	wt%	42	42	3.996^c2	2.297^c2
Cd	mg kg^−1	21	20	2.64^c2	2.23^c2
Ce	mg kg^−1	15	16	2.99^c2	0.743^c2
Cl	wt%	4	4	0.772^i2	0.457^i2
Co	ng g^−1	32	23	981^c2	154^c2
Cr	mg kg^−1	33	30	6.30^i2	0.911^i2
Cs	ng g^−1	19	12	288^c2	26.6^i2
^137Cs	Bq kg^−1	1	1	2.40	2.70
Cu	mg kg^−1	50	47	10.1^c2	5.12^c2
Dy	ng g^−1	5	2	184^i1	38.0
Er	ng g^−1	5	5	101^c1	18.5^c1
Eu	ng g^−1	17	14	60.2^c2	14.0^c2
F	mg kg^−1	1	1	26.4	19.6
Fe	mg kg^−1	60	61	1491^i1	258^i1
Ga	ng g^−1	2	2	518	78
Gd	ng g^−1	3	2	243^i1	52
Ge	ng g^−1	2	1	34	10
Hf	ng g^−1	10	9	291^c1	161^c1
Hg	ng g^−1	20	23	20.9^c2	23.2^c2
Ho	ng g^−1	3	1	34.5^i1	6.0
I	ng g^−1	3	2	843	337
In	ng g^−1	1	1	2.0	0.5
K	wt%	41	40	2.271^c2	2.640^c2
^40K	Bq kg^−1	1	1	633	722
La	mg kg^−1	16	16	1.69^c2	0.540^c2
Li	mg kg^−1	11	10	19.3^i1	3.35^c1
Lu	ng g^−1	6	4	16.7^i2	5.7
Mg	wt%	37	37	0.853^c2	0.241^c2
Mn	mg kg^−1	43	43	180^c2	136^c2
Mo	ng g^−1	8	7	414^c1	396^c1
N	wt%	2	2	2.7	2.8
Na	mg kg^−1	21	21	435^i2	62.4^i2
Nb	ng g^−1	2	2	127	33
Nd	mg kg^−1	6	5	1.33^c1	0.322^c1
Ni	mg kg^−1	24	21	8.50^c2	1.49^c2
P	wt%	16	17	0.170^c1	0.242^c1
Pb	mg kg^−1	20	19	2.01^c2	0.972^c2
Pd	ng g^−1		1		45
^210Po	Bq kg^−1	2	2	19.5	22.2
Pr	ng g^−1	4	4	321^i1	82.9^i1
Pt	ng g^−1	1	1	0.1	0.1
^239Pu	Bq kg^−1	1		0.007
Rb	mg kg^−1	18	17	19.1^c	5.97^c
Re	ng g^−1	1	1	7.0	1.4
Ru	ng g^−1	1	1	0.8	1.0
S	wt%	6	6	0.455^c2	0.378^c2
Sb	ng g^−1	12	10	75.5^c1	37.2^c1
Sc	ng g^−1	10	11	640^c2	59.5^c2
Se	ng g^−1	8	11	172	153
Si	wt%	5	5	0.527	0.198
Sm	ng g^−1	16	14	264^c2	58.0^c2
Sn	ng g^−1	5	3	260	31.1^i1
Sr	mg kg^−1	24	24	105^c2	133^c2
^90Sr	Bq kg^−1	1	1	21	13
Ta	ng g^−1	5	5	41.7^c1	10.9^c1
Tb	ng g^−1	8	7	34.7^c2	8.1^c2
Th	ng g^−1	11	11	503^c2	88.8^c2
Ti	mg kg^−1	11	11	80.7^i1	12.3^i1
Tl	ng g^−1	4	3	51.3^i2	22.8^i2
Tm	ng g^−1	3	2	13.6^i1	2.4
U	ng g^−1	13	7	113^i1	22.0^i1
^234U	Bq kg^−1	1	1	0.51	0.34
^238U	Bq kg^−1	2	2	1.24	0.92
V	mg kg^−1	10	10	4.12^c2	0.405^c2
W	ng g^−1	1	2	33	32
Y	ng g^−1	4	4	963^i1	218^i1
Yb	ng g^−1	10	7	115^c2	28.3^i2
Zn	mg kg^−1	64	64	52.4^c2	43.6^c2
Zr	mg kg^−1	7	7	6.35	3.50

^c1Certified value assigned employing the original database, ^c2employing the alternative database. ⁱ¹Information value assigned employing the original database, ⁱ²employing the alternative database.