Environmental Engineering Reference
In-Depth Information
Lake Mälaren
Lake Mälaren
Lake Trekanten
Lake Trekanten
Cu concentration
0-15
µ
g g
-1
15-100
µ
g g
-1
100-500
µ
g g
-1
>500
µ
g g
-1
Zn concentration
0-150
µ
g g
-1
150-1000
µ
g g
-1
1000-5000
µ
g g
-1
>5000
µ
g g
-1
Lake Björnsjön
(reference)
Lambarfjärden
(upstream)
Archiepelago
(downstream)
Lake Björnsjön
(reference)
Lambarfjärden
(upstream)
Archiepelago
(downstream)
Lake Drevviken
Lake Drevviken
Lake Mälaren
Lake Mälaren
Lake Trekanten
Lake Trekanten
Cd concentration
0-0.8
µ
g g
-1
0.8-7
µ
g g
-1
7-35
µ
g g
-1
>35
µ
g g
-1
Pb concentration
0-50
µ
g g
-1
50-400
µ
g g
-1
400-2000
µ
g g
-1
>2000
µ
g g
-1
Lake Björnsjön
(reference)
Lambarfjärden
(upstream)
Archiepelago
(downstream)
Lake Björnsjön
(reference)
Lambarfjärden
(upstream)
Archiepelago
(downstream)
Lake Drevviken
Lake Drevviken
Fig. 1
Distribution of Cu, Zn, Pb and Cd in Stockholm sediments. The two highest concentra-
tions represent high and very high concentrations in Swedish EPA sediment concentration guide-
lines
[7]
The lowest concentrations are found at the background sites (Lake Bornsjön
and Lambarfjärden), although Cu and Zn are considered to be moderately high at
Lambarfjärden. The highest concentrations are found in the inner city area. Copper
concentrations are considered to be high throughout the city, while high Zn concen-
trations are only found at Lake Trekanten. Urban Zn and Pb concentrations are in
general moderately high, with high concentrations only observed at Lake Trekanten
and Årstadal, respectively. Cadmium concentrations are in general low or moder-
ately high.
Antimony, Tungsten, Tin and Silver
Antimony concentrations range from 0.1 to 8.9 mg/g. The lowest concentration was
found at Lake Bornsjön. Concentrations do not exceed 2.5 mg/g, except for
Årstadal, where an average concentration of 8.9 mg/g was measured (Fig.
2
).
Tungsten concentrations range from 1.1 to 37 mg/g, with relatively low concen-
trations at most sampling sites and elevated concentrations only present at a limited
