1. General Model Information
Name: Exposure Estimation for potentially Ecotoxic Environmental CHEMicals
Main medium: terrestrial+air+aquatic
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model, ordinary differential equations
Keywords: fate, exposure degradation, chemical, volatilisation, leaching, deposition, transport diffusion
Dr. R Brüggemann
The predominant aims of E4CHEM:
In combination with statistics and algebraic tools (lattice theory) but not
included in E4CHEM, yet:
- Deterministic description of the chemical's behavior in the environment
with varying ecoparameters including the special aspects.
- Behavior of the same chemicals in different compartments.
- Behavior of different chemicals in the same compartment with the same
- Tracing back of chemicals detected in the environment to the possible
source by means of check procedures like EXWAT, one of E4CHEM models.
- Discharge of the user from extensive calculation operations.
- Interpretation of experimental results.
- Selection of descriptors as tool for priority setting.
- Identification and ranking of chemicals accordinge to their risk to the
environment by comparing descriptors within descriptor matrices about the
behavior of chemicals derived from the different models.
- Identification of chemicals applicable as reference substances with
respect to environmental behavior.
- Identification of sensitive environmental areas to be selected for
- Only considered as a tool for further evaluation, modelling cannot come
up to a decision itself. Ecological relations may be described by
appropriate modelling in the near future but the arguments for decisions
and management have to be derived from other considerations e.g. ethic,
political or economic arguments.
- Taking into regard the high simplification behind the models (compared
with the complex environmental relationships of nature), these models have
to be managed, interpreted and validated by field studies with great care.
Principle and structure of the E4CHEM-system
E4CHEM combines by
a set of environmental medium related models. The intermedial transport and
intramedium transfer processes which connect the models of E4CHEM are shown
in the figure below.
- Formulation of mass balance
- Calculation of local equilibrium state
- Formulation of transfer kinetics
| Selection criteria for ranking chemicals
|| Models of E4CHEM
|| Input data
| Release potential
| Release rate from production, manufacturing, use, release path
|| Amount of production, use pattern
| Distribution potential
| Distribution tendency between different media
|| Physico-chemical substance data, Compartment parameters
| Exposure potential
| Accumulation, Mobility, Persistence
||EXAIR, EXWAT, EXSOL, EXINT, EXATM, EXPLA
|| Physico-chemical substance data, degradation constants, bioconcentration constants, environmental parameters
(Source: Brüggemann,R., U. Drescher-Kaden, B Münzer (1996) E4CHEM -
A Simulation Program for the Fate of Chemicals in the Environment.
GSF-Bericht 2/96 (ISSN 0721-1694).)
II. Technical Information
Operating System(s): DOS (please contact the author)
III. Mathematical Information
Brüggemann,R., U. Drescher-Kaden, B Münzer (1996) E4CHEM - A Simulation Program for the Fate of Chemicals in the Environment.
GSF-Bericht 2/96 (ISSN 0721-1694).
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: 29.05.96
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:42 CEST 2002