222
Table 7.2 Trace elements concentrations in five sampling sites along the Tinto river channel (Southwest Iberian Peninsula) and pH values in the different
sampling sites
Site
Distance
from the
river mouth
(km)
pH
Trace element concentration (ppm D.W.)
Zn
Cu
Cd
Pb
Cr
Ni
Al
Fe
As
1
0
7.5 ± 0.0
770 ± 121
109 ± 4
≤ 0.1
32 ± 3
13 ± 1
≤ 0.1
577 ± 23
333 ± 11
25 ± 2
2
1.7
4.0 ± 0.1
1062 ± 114
413 ± 36
≤ 0.1
1085 ± 179
35 ± 5 6 ± 0
1254 ± 77
4659 ± 565
967 ± 129
3
10.0
2.9 ± 0.1
778 ± 41
289 ± 55
≤ 0.1
811 ± 87
35 ± 7 6 ± 0
1714 ± 391
3587 ± 166
906 ± 96
4
15.1
2.5 ± 0.1
1233 ± 114
276 ± 38
≤ 0.1
1195 ± 92
40 ± 3 11 ± 1 1856 ± 132
3820 ± 193
766 ± 36
5
28.9
2.8 ± 0.1
3118 ± 131
504 ± 24
1.0 ± 0.0
7575 ± 232
61 ± 1 15 ± 1 2476 ± 49
8698 ± 89
3872 ± 107
Modified from Curado et al. (2010)
S.M. Vallés et al.