CHAPTER 4 . Redox Processes in Anoxic Waters
117
Fig. 4.23. The effect of Zn and
Cu on the rate of oxidation of
H2S in sea water at 25 °C and
pH=8.1
Fig. 4.24. The effect of Fe and
Mn on the rate of oxidation of
H2S in sea water at 25 °C and
pH=8.1
....
j
~'?.
Sf
.....
1
j
4 r--------,---------,---------r--------~
2
0
- 2
- 10
3
2
0
e Zn
o Cu
-8
.,
• • •
e ·
e
-6
-4
- 2
log [M)
- 1 L -_ _ _ _ ~ _ _ _ __ _ _ L _ _ _ __ _ ~ _ _ _ _ _ _ ~ _ __ _ ~
- 8
-7
-6
- 5
-4
- 3
log[MJ
The concentration of thiosulfate increases slowly throughout the reaction after an
initial lag period. This suggests that thiosulfate is not the initial product of the oxidation. Thiosulfate is a stable product in the absence of bacteria and little oxidation oc-