The certificate for the IAEA 158A CRM is the only official source for the trace elements mass fractions certified values and their expanded uncertainties.
Certified mass fraction values
(based on dry mass)
Analyte
Certified value(a)
[mg kg-1]
Expanded uncertainty(b)
Al
52.2 × 103
2.4 × 103
As
12.0
1.0
Ba
1.031 × 103
0.083 × 103
Ca
65.3 × 103
2.8 × 103
Cd
0.361
0.043
Ce
54.1
5.6
Co
9.19
0.90
Cr
77.0
8.2
Eu
1.098
0.085
Fe
26.6 × 103
1.2 × 103
K
20.5 × 103
1.5 × 103
La
28.5
3.1
Li
33.5
3.3
Mg
10.86 × 103
0.58 × 103
Mn
367
19
Na
23.91 × 103
0.88 × 103
Nd
25.1
2.6
Ni
31.1
2.1
Pb
41.0
5.2
Rb
87.4
7.2
Sm
4.64
0.52
Sr
478
54
U
2.40
0.33
V
74.1
Y
17.1
1.1
Yb
2.02
0.24
Zn
141
18
Certified values are calculated from the accepted data sets, each set being obtained by a different laboratory and/or a different method of determination following ISO Guide 35 [1].
The uncertainty is expressed as an expanded uncertainty with a coverage factor k = 2, corresponding to a 95% level of confidence, estimated in accordance with the JCGM 100:2008 [2] and ISO Guide 35 [1].
The assigned property values were established, considering the results reported by expert laboratories, participating in the characterisation campaign for the IAEA 158A. The characterisation campaign was organised by the IAEA Environment Laboratories in Monaco. The details concerning the production process and all reported results, as well as the criteria for the assignment of property values are presented in the certification report for the IAEA 158A.