1. General Model Information

Name: Exposure Analysis Modeling System

Acronym: EXAMS

Main medium: terrestrial
Main subject: biogeochemistry, hydrology
Organization level: landscape, ecosystem
Type of model: ordinary differential equations
Main application: decision support/expert system, research
Keywords: water quality, chemicals, aquatic, ecosystems, exposure, fate, persistence, database


Center for Exposure Assessment Modeling (CEAM)
U.S. Environmental Protection Agency
Environmental Research Laboratory
College Station Road
Athens, Georgia 30613
Phone: (404) 546-3123
Lawrence A. Burns, Ph. D.


Lawrence A. Burns, Ph. D. Research Ecologist
Environmental Research laboratory
U.S. Environmental protection Agency
Athens, Georgia 30613 USA


Exposure Analysis Modeling System is an interactive modeling system that allows a user to specify and store the properties of chemicals and ecosystems, modify either via simple commands, and conduct rapid evaluations and error analyses of the probable aquatic fate of synthetic organic chemicals. EXAMS combines chemical loadings, transport, and transformation into a set of differential equations using the law of conservation of mass as an accounting principle. It accounts for all the chemical mass entering and leaving a system as the algebraic sum of external loadings, transport processes that export the compound from the system, and transformation processes within the system that convert the chemical to daughter products. The program produces output tables and simple graphics describing chemical exposure, fate, and persistence.


II. Technical Information

II.1 Executables:

Operating System(s): (see section IV.) DOS
  • DOS/EXAMS-Version2.96(includes fortran source and documentation)
  • Europe: DOS/EXAMS-Version2.96(includes fortran source and documentation)

    II.2 Source-code:

    Programming Language(s): (see section IV.)

    II.3 Manuals:

    II.4 Data:

    (see section IV.)

    III. Mathematical Information

    III.1 Mathematics

    III.2 Quantities

    III.2.1 Input

    III.2.2 Output

    IV. References

    Games, L. M. (1982)Field Validation of Exposure Analysis Modeling System (EXAMS) in a FlowingStream In: Modeling the Fate of Chemicals in the Aquatic Environment, Ann ArborScience, Ann Arbor, Mi 1982:325-346

    V. Further information in the World-Wide-Web

    VI. Additional remarks

    Last review of this document by: T. Gabele: 1. 08. 1997 -
    Status of the document:
    last modified by Tobias Gabele Wed Aug 21 21:44:42 CEST 2002

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