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Ann. occup. Hyg., Vol. 24, No. 2, pp. 175-183, 1981
© 1981 British Occupational Hygiene Society
Published by Oxford University Press

research-article

MATHEMATICAL MODELLING IN THE HAZARD ASSESSMENT OF SUBSTANCES FORMING TOXIC DECOMPOSITION PRODUCTS. THE EXAMPLE OF CARBON TETRACHLORIDE

ANDERS BJERRE

Department of Physical Chemistry, Chemical Institute, University of Aarhus DK-8000 Aarhus C, Denmark

For substances that may decompose in the industrial environment forming highly toxic secondary pollutants a computer simulation of the decomposition process gives useful information to the industrial hygienist. This paper presents a model for the decomposition of a gaseous substance contacting a hot surface. Application of the model to carbon tetrachloride being oxidized to phosgene etc. on a silica surface indicates that the decomposition may be of hygienic importance from circa 200–250°C, a much lower temperature than expected from published laboratory investigations of CCl4. Conventional laboratory investigations are shown to be of limited value for health hazard assessment purposes under varied conditions.


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