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Caractérisation des flux de gaz émis par un sol pollué

Abstract : Inhalation of volatile chemicals emitted from a contaminated soil might form a major exposure way for people living on site and in the surroundings. It is essential then to quantify ambient air concentrations for characterizing such exposure and assessing the risks for human health. Two approaches are commonly used : Direct ambient air monitoring only supplies punctual information which is strongly dependent on the prevailing meteorological conditions. Furthermore, concentrations lying below the analytical detection limits cannot be measured whereas they may be harmful to health, especially in the case of a long term exposure. Some exposure models include transfer functions which derive concentrations in the atmosphere from those measured in soil or in the soil pore-air. Such functions are based on simplified hypothesis and can ignore site characteristics likely to influence atmospheric dispersion. To overcome the limitations of both methods INERIS has examined the possibility of using atmospheric dispersion models. According to a preliminary modelling study, they might be useful tools to produce quantitative maps of short term worst case or long term concentrations, making it possible to delimit the impact area of the emissions from the soil. However, the reliability of the model predictions largely depend on the precision of the input data. In particular the pollution source should be defined very carefully. This is why INERIS has devised a strategy for getting a quantitative spatial representation of soil-to-air fluxes : it combines emission measurements with an original monitoring device and interpolation between the measured values using geostatistical techniques. This strategy was tested on an experimental site near Strasbourg (France).
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Submitted on : Thursday, May 6, 2021 - 10:20:41 PM
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Laure Malherbe, Corinne Hulot, Zbigniew Pokryszka, Laurence Rouil. Caractérisation des flux de gaz émis par un sol pollué. Environnement, Ingénierie & Développement, 2003, N°32 - 4ème Trimestre 2003, pp.16-19. ⟨10.4267/dechets-sciences-techniques.2484⟩. ⟨ineris-00962869⟩



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