2 The Methodology of the Study
17
use of standards that have different compositions (and even physical state) from that
of the sample (Filby 1995; Frontasyeva 2011). The certified and the experimental
values (mean ± standard deviation) for the used reference materials are shown in
Table 2.3.
The mean contents of the elements under investigation were in good agreement
with the certified data.
Table 2.3 The certified and
the experimental values
(mean ± standard deviation)
for the used reference
materials (content in mg/kg,
DW, ENAA)
Elements
CV ± SD
DV ± SD
Ti d
7910 ± 142
7896 ± 184
Sc a
13.7 ± 0.69
13.69 ± 0.74
Cr a
178 ± 16
178 ± 17
Fe a
44,800 ± 986
44,819 ± 2106
Co a
23.0 ± 1.29
23.0 ± 1.3
Se c
1.29 ± 0.109
1.29 ± 0.17
Br a
99.7 ± 2.5
99.75 ± 2.89
Rb c
5.05 ± 0.11
5.06 ± 0.90
Sr b
245.3 ± 0.7
245.13 ± 17.16
Zr b
230 ± 69.0
230 ± 70
Mo b
1.60 ± 0.48
1.60 ± 0.51
Sb b
19.4 ± 1.8
19.4 ± 1.8
Cs a
7.80 ± 0.70
7.81 ± 0.71
La a
27.8 ± 1.00
27.83 ± 1.11
Ce a
56.7 ± 2.49
56.63 ± 3.40
Nd a
25.0 ± 1.40
24.98 ± 817
Sm a
4.66 ± 0.20
4.65 ± 0.23
Eu a
1.00 ± 0.01
0.99 ± 0.19
Gd a
4.41 ± 0.119
4.42 ± 0.28
Tb a
0.682 ± 0.017
0.681 ± 0.024
Tm a
0.326 ± 0.025
0.325 ± 0.070
Yb a
2.20 ± 0.09
2.19 ± 0.24
Hf b
7.30 ± 2.19
7.29 ± 2.19
Ta a
0.876 ± 0.0175
0.876 ± 0.027
W b
3 ± 0.9
3.00 ± 0.92
Th c
1.342 ± 0.036
1.34 ± 0.04
U a
2.26 ± 0.15
2.26 ± 0.15
CV Certified value; DV Determined value
Note The subscription of each element refer to the certified material
used to calculate the concentration of the elements ( a BCR-667;
b SRM 2711; c SRM 1632b; d SRM 1633b)
17
use of standards that have different compositions (and even physical state) from that
of the sample (Filby 1995; Frontasyeva 2011). The certified and the experimental
values (mean ± standard deviation) for the used reference materials are shown in
Table 2.3.
The mean contents of the elements under investigation were in good agreement
with the certified data.
Table 2.3 The certified and
the experimental values
(mean ± standard deviation)
for the used reference
materials (content in mg/kg,
DW, ENAA)
Elements
CV ± SD
DV ± SD
Ti d
7910 ± 142
7896 ± 184
Sc a
13.7 ± 0.69
13.69 ± 0.74
Cr a
178 ± 16
178 ± 17
Fe a
44,800 ± 986
44,819 ± 2106
Co a
23.0 ± 1.29
23.0 ± 1.3
Se c
1.29 ± 0.109
1.29 ± 0.17
Br a
99.7 ± 2.5
99.75 ± 2.89
Rb c
5.05 ± 0.11
5.06 ± 0.90
Sr b
245.3 ± 0.7
245.13 ± 17.16
Zr b
230 ± 69.0
230 ± 70
Mo b
1.60 ± 0.48
1.60 ± 0.51
Sb b
19.4 ± 1.8
19.4 ± 1.8
Cs a
7.80 ± 0.70
7.81 ± 0.71
La a
27.8 ± 1.00
27.83 ± 1.11
Ce a
56.7 ± 2.49
56.63 ± 3.40
Nd a
25.0 ± 1.40
24.98 ± 817
Sm a
4.66 ± 0.20
4.65 ± 0.23
Eu a
1.00 ± 0.01
0.99 ± 0.19
Gd a
4.41 ± 0.119
4.42 ± 0.28
Tb a
0.682 ± 0.017
0.681 ± 0.024
Tm a
0.326 ± 0.025
0.325 ± 0.070
Yb a
2.20 ± 0.09
2.19 ± 0.24
Hf b
7.30 ± 2.19
7.29 ± 2.19
Ta a
0.876 ± 0.0175
0.876 ± 0.027
W b
3 ± 0.9
3.00 ± 0.92
Th c
1.342 ± 0.036
1.34 ± 0.04
U a
2.26 ± 0.15
2.26 ± 0.15
CV Certified value; DV Determined value
Note The subscription of each element refer to the certified material
used to calculate the concentration of the elements ( a BCR-667;
b SRM 2711; c SRM 1632b; d SRM 1633b)