ANNEXE 4
Analyses chimiques (ICP) des différents profils de prélèvement
et de l'échantillon "composite” (sédiment Cl)
Prélèvements
Elément
Profil 1
Profil 2
Profil 3
Profil 4
Composite
SiO2 (%)
57
49.5
50.7
48.3
50.4
MgO (%)
2.2
1.1
<1
1
1
A12O3(%)
13.9
9.4
8
8.5
7.4
K.0 (%)
2.9
2
1.8
1.8
1.6
Fe2O3(%)
4.7
3.2
3
2.8
2.9
MnO (%)
0.02
0.06
0.06
0.05
0.07
CaO (%)
4.8
9.1
8.3
9.7
9.1
TiO? (%)
0.73
0.53
0.48
0.52
0.44
P2O5 (ppm)
1 410
7 789
10 780
8 008
9 113
V (ppm)
110
59
54
53
61
Cu (ppm)
39
359
350
229
326
Y (ppm)
25
21
<20
20
<20
Cd (ppm)
14
482
356
127
371
La (ppm)
39
26
25
26
24
Bi (ppm)
<10
<10
<10
<10
<10
Nb (ppm)
<20
<10
<20
<20
<20
Cr (ppm)
107
125
128
136
130
Zn (ppm)
603
9 605
9 105
5 458
9 441
Sn (ppm)
10
173
154
69
126
Ce (ppm)
69
42
42
51
59
Zr (ppm)
136
226
218
227
208
Be (ppm)
<2
<2
<2
<2
<2
Co (ppm)
17
8
8
7
12
As (ppm)
<20
211
183
167
Mo (ppm)
<5
<5
<5
<5
<5
Sb (ppm)
<10
101
82
27
83
W (ppm)
<10
<10
<10
<10
<10
B (ppm)
118
48
47
45
41
Ni (ppm)
55
41
35
34
53
Sr (ppm)
139
177
170
171
164
Ag (ppm)
0.5
28.4
22.3
8.3
18.3
Ba (ppm)
265
445
433
407
411
Pb (ppm)
402
10 000
9 000
2 104
7 000
257