Adsorption coefficients for TNT on soil and clay minerals

Rosángela Rivera; Julissa Pabón; Omarie Pérez; Miguel A. Muñoz; Nairmen Mina

doi:10.1117/12.721178

27 April 2007 Adsorption coefficients for TNT on soil and clay minerals

Rosángela Rivera, Julissa Pabón, Omarie Pérez, Miguel A. Muñoz, Nairmen Mina

Proceedings Volume 6553, Detection and Remediation Technologies for Mines and Minelike Targets XII; 65531L (2007) https://doi.org/10.1117/12.721178
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

To understand the fate and transport mechanisms of TNT from buried landmines is it essential to determine the adsorption process of TNT on soil and clay minerals. In this research, soil samples from horizons Ap and A from Jobos Series at Isabela, Puerto Rico were studied. The clay fractions were separated from the other soil components by centrifugation. Using the hydrometer method the particle size distribution for the soil horizons was obtained. Physical and chemical characterization studies such as cation exchange capacity (CEC), surface area, percent of organic matter and pH were performed for the soil and clay samples. A complete mineralogical characterization of clay fractions using X-ray diffraction analysis reveals the presence of kaolinite, goethite, hematite, gibbsite and quartz. In order to obtain adsorption coefficients (K_dvalues) for the TNT-soil and TNT-clay interactions high performance liquid chromatography (HPLC) was used. The adsorption process for TNT-soil was described by the Langmuir model. A higher adsorption was observed in the Ap horizon. The Freundlich model described the adsorption process for TNT-clay interactions. The affinity and relative adsorption capacity of the clay for TNT were higher in the A horizon. These results suggest that adsorption by soil organic matter predominates over adsorption on clay minerals when significant soil organic matter content is present. It was found that, properties like cation exchange capacity and surface area are important factors in the adsorption of clayey soils.

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Rosángela Rivera, Julissa Pabón, Omarie Pérez, Miguel A. Muñoz, and Nairmen Mina "Adsorption coefficients for TNT on soil and clay minerals", Proc. SPIE 6553, Detection and Remediation Technologies for Mines and Minelike Targets XII, 65531L (27 April 2007); https://doi.org/10.1117/12.721178

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KEYWORDS

Adsorption

Minerals

Soil contamination

Soil science

Explosives

Land mines

Chemical analysis

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