A
B
H
2
S [
μ
M]
O
2
[
μ
M]
Redox [mV]
N
2
O [
μ
M]
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16
14
12
10
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6
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0
1
2
3
4
0
50
100
150
200
100
150
200
250
300
0.0
0.3
0.6
0.9
1.2
Depth [mm]
H
2
S [
μ
M]
O
2
[
μ
M]
Redox [mV]
N
2
O [
μ
M]
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22
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18
16
14
12
10
8
6
4
2
0
−
1
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20
40
60
0
100
200
300
400
100
150
200
5
10
15
20
Depth [mm]