4 2
§
-r
Z
15
12
/ . , ,:o 7
10
20
30
40
,~ 1
=1
1
r = 0 . 9 ~ 3
0
0 !
0
50
0
10
20
30
40
Alkalinity (meq/l)
Alkalinity (meq/l)
50
E
+
r
e~
J
S r = o . y / ~ 4
!
"7,
i
==
/
r = O. 9 9 8 0
0
0
o
io
20
30
4o
50
io
20
30
40
Alkalinity (meq/1)
Alkalinity (meq/1)
50
Fig. 4.16. Relationship between NH4*, Ca 2., Mg a*, conductivity, and alkalinity in the
porewater at Lauffen
Carbonate dissolution, ion exchanges with Ca 2+ and Mg 2+, and NH4 + production
during the mineralization of organic matter contribute to the alkalinity in the
sediments. The significant correlations between alkalinity, NH4 +, Ca 2+, and Mg 2+ in