30
-10
0
20
40
60
80
0
.-. -10'
E
,~ o
E 20 ~,
=
g
r
4 0
9
o~
60
t-',
813
0.0
-10
0~
|11
20
40
6O
8O
0
mg
0.2
a. Lauffen
t I
0.2
0.4
20t
40
60t
80t
0.4
0.6 -6 -4 -2 0 2 4 6
b. Kochendorf
-10~
1
0.6 -6 -4 -2 0 2 4 6
IN 9
c. Wieblingen
0.2
0.4
0
2
4
Fe 2+ (raM)
Fe (%)
-10
o
20
(
4O
60
()
80
.
9
0.6 -6 -4 -2 0 2 4 6
Saturation Index (SI)
siderite
0
2
4
6
0
2
4
6
Fig. 4.8. Dissolved Fe 2+, SI of siderite, and Fe in the sediments of the Neckar River