Identification of the Lagoon Ecosystems - Coastal Lagoons: Ecosystem Processes and Modeling for Sustainable Use and Development - page 31

Toxicity Tests
( See Fig. 2.9 III)

Acceptable
maximal
effects

The dose-effect curve for the components of the
trophodynamic modules in the structure of the
main categories of the ecological systems

Tolerable maximal
concentration

Concentration of the substance
in the test models

Maximum
carrying capacity

Threshold estimation
according to
II, IV, V ( Fig. 2.9) Highest tolerable

loads

Chemical
loads in
troposphere
& HGMU
compartments

Residual
loading
capacity

Total
loading
capacity

Loading
at time t 1

FIGURE 2.10 Tools for the evaluation of the impact of toxic chemical substances and for
the drawing up of low risk solutions (depending on the quality of data knowledge base,
continuously consolidated according to the model illustrated in Figure 2.9 ).

Scenarios regarding production,
use, and discharge of chemical
substances with potential
harmful effect

- Dispersion pathways;
- Loading the HGMU
compartments and
the troposphere

Evaluation of effects
III
(dose-effect)

Estimation of concentrations,
accumulation and
concentration rates in the
components of the cycling
compartment

Tolerable
effects

Estimation of long distance and
long-term cumulative effects

Evaluation of the impact using the residual
carrying capacity and loading capacity as terms
of reference of each type of ecological system

Option for the scenario where the
carrying capacity is not exceeded

FIGURE 2.11 Diagram for drawing up and checking the scenarios regarding management
of toxic chemical compounds.