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Dernière mise à jour : Mai 2018

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Soil Science Research Unit

Porosimétrie à mercure

La porosimétrie au mercure permet de mesurer la distribution des volumes de pores d’un échantillon de sol ou de roche par l’intermédiaire du diamètre d’entrée de ces pores. Elle permet d’avoir accès à la distribution de taille des pores.

Porosimètre (c) INRA

Principe

Le principe consiste à injecter sous pression un liquide non mouillant, le mercure, dans le réseau poreux de l’échantillon sous vide. Le mercure pénètre dans des pores de diamètre d’entrée d’autant plus petits que la pr

ession exercée est élevée, selon la loi de Laplace.
Le porosimètre Micromeritics 9310 fonctionne dans une gamme de pression variant de 0 à 200 MPa, ce qui permet la description de pores dont les diamètres équivalents sont compris entre 200 et 0,006 µm.

Echantillons

Les échantillons de terre ou de roche sous forme de petits agrégats ou de fragments de 0,5 à 2 cm3 environ, sont introduits dans des pénétromètres de 5 cm3. Des pénétromètres à poudre sont disponibles pour des échantillons pulvérulents.