1.O+---,----~-----,-o
100
1000
10000
Sediment mg I kg
Cadmium
,
,
01 3
-"
....
,
01
E
•
.!!! 2
,
~
,-e
.,
z
,~"~
•••
• ,/e •
4\ .- •
~/~ ..
• •
0
2
6
8
10
Sediment mg Ikg
1000
100
01
-"
....
E' 1O
111
iii
0;
z 1.0
0.1
10
Silver
Ul
1.0
10
Sediment mg I kg
Lead
•
/
. ~// -.
. . . .
.... ',' ... ,
"M
." .
• •
laO
1000 10000
Sediment mg I kg
Fig. 67. In southwest England, sediment with widely differing amounts of heavy metals can be
found, depending on geological-mineralogical conditions and waste water relationships of the
mines (see Table 25). The heavy metal concentrations in the Nereis diversicolor polychaet differ
corresponding to the different locations in which they are found. Simple relationships exist
between the heavy metal concentrations in the sediment and body tissue. Concentrations are
indicated in mg/kg dry weight (Bryan 1974)
analyzed for heavy metals, chlorinated hydrocarbons, hydrocarbons, and radioactive
elements. During the pilot phase the cost to obtain each sample was 1000 US $, each
series of heavy metal analyses amounted to 50 US $, each series of organic pollutant
analysis to 1000 US $. From the results it is evident that most compounds are rather
unifonnly distributed over the coastal regions, an expression of large-region or global
marine pollution. But some regional influences can also be detected (Goldberg et al.
1978).
Uptake of trace metals from seawater follows several different ways which are partly
combined. The mechanisms can best be studied in experiments with a heavy metal
which is of rather low toxicity and can be added to the seawater or the culture
medium in rather high concentrations without impairing the organisms too much.
For this reason, many experiments have been done with lead.
If algae cultures are contaminated with lead, an amount dependent on the lead concentration is at first absorbed by the surface layer of the algal cells. This does not
seem to be an active process, but is caused by the physicochemical characteristics of
the cell surface. The addition of complexing agents (EDTA) hinders the absorption
131
100
1000
10000
Sediment mg I kg
Cadmium
,
,
01 3
-"
....
,
01
E
•
.!!! 2
,
~
,-e
.,
z
,~"~
•••
• ,/e •
4\ .- •
~/~ ..
• •
0
2
6
8
10
Sediment mg Ikg
1000
100
01
-"
....
E' 1O
111
iii
0;
z 1.0
0.1
10
Silver
Ul
1.0
10
Sediment mg I kg
Lead
•
/
. ~// -.
. . . .
.... ',' ... ,
"M
." .
• •
laO
1000 10000
Sediment mg I kg
Fig. 67. In southwest England, sediment with widely differing amounts of heavy metals can be
found, depending on geological-mineralogical conditions and waste water relationships of the
mines (see Table 25). The heavy metal concentrations in the Nereis diversicolor polychaet differ
corresponding to the different locations in which they are found. Simple relationships exist
between the heavy metal concentrations in the sediment and body tissue. Concentrations are
indicated in mg/kg dry weight (Bryan 1974)
analyzed for heavy metals, chlorinated hydrocarbons, hydrocarbons, and radioactive
elements. During the pilot phase the cost to obtain each sample was 1000 US $, each
series of heavy metal analyses amounted to 50 US $, each series of organic pollutant
analysis to 1000 US $. From the results it is evident that most compounds are rather
unifonnly distributed over the coastal regions, an expression of large-region or global
marine pollution. But some regional influences can also be detected (Goldberg et al.
1978).
Uptake of trace metals from seawater follows several different ways which are partly
combined. The mechanisms can best be studied in experiments with a heavy metal
which is of rather low toxicity and can be added to the seawater or the culture
medium in rather high concentrations without impairing the organisms too much.
For this reason, many experiments have been done with lead.
If algae cultures are contaminated with lead, an amount dependent on the lead concentration is at first absorbed by the surface layer of the algal cells. This does not
seem to be an active process, but is caused by the physicochemical characteristics of
the cell surface. The addition of complexing agents (EDTA) hinders the absorption
131