Environmental Engineering Reference
In-Depth Information
Concentration
Background
Total
concentration
Unnaturally
discharged
Start of contamination discharge
from external sources—tied into
start of Industrial Revolution,
1750?
Background
FIGURE 8.9
Concept of background value of metal concentrations in sediments. The
unnaturally
discharged concentrations
are likely due to discharges from land-based industries and land-based non-point contamination sources.
400
Estimated
B
G
300
200
100
Zn = 130 mg/kg
0
0
20
40
60
80
100
Fines content (%)
FIGURE 8.10
Deviation of zinc concentration in various sediments.
B
G
, background concentration.
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