371
206
207
208
Goji berry - MK
Goji berry - China
0
10000
20000
30000
40000
50000
60000
cps
)
d
n
o
c
e
s
r
e
p
s
t
n
u
o
c
(
Fig. 12.3 ICP-MS intensity measurements (cps) for
206
Pb,
207
Pb and
208
Pb isotopes
assignation of food samples. The technique is sometimes able to distinguish the
geographical origin of samples by itself. More frequently it is very effective to use
it with other determinations and then combined via multivariate statistics. One of
the greatest limitations to the application of the technique in the origin assignation
is the lack of large databases of isotopic abundances in food items.
Table 12.2 Total content of lead in goji samples – comparative analysis
Element
Samples from China (in mg/
kg)
Samples from North Macedonia (in
mg/kg)
t
p
a
min
max Mean SD
min
max Mean SD
Pb
0.015 0.096 0.054 0.028 0.008
0.028 0.022 0.01 3.08 0.03
a
Significant difference occurs for obtained values of p < 0.05
Table 12.3 Data summary for the Pb isotope ratios (comparative analysis)
Sample
N
207 Pb/
206 Pb
208
Pb/
206
Pb
Goji berries – North Macedonia
10
0.951 ± 0.15
1.062 ± 0.09
Goji berries – China
10
0.868 ± 0.10
2.070 ± 0.08
12 Characterization of Multi-element Profiles and Multi-isotope Ratio Records as…