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Proceedings Paper

Adsorption coefficients for TNT on soil and clay minerals
Author(s): Rosángela Rivera; Julissa Pabón; Omarie Pérez; Miguel A. Muñoz; Nairmen Mina
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Paper 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 (Kd values) 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.

Paper Details

Date Published: 27 April 2007
PDF: 12 pages
Proc. SPIE 6553, Detection and Remediation Technologies for Mines and Minelike Targets XII, 65531L (27 April 2007); doi: 10.1117/12.721178
Show Author Affiliations
Rosángela Rivera, Univ. of Puerto Rico at Mayagüez (United States)
Julissa Pabón, Univ. of Puerto Rico at Mayagüez (United States)
Omarie Pérez, Univ. of Puerto Rico at Mayagüez (United States)
Miguel A. Muñoz, Univ. of Puerto Rico at Mayagüez (United States)
Nairmen Mina, Univ. of Puerto Rico at Mayagüez (United States)


Published in SPIE Proceedings Vol. 6553:
Detection and Remediation Technologies for Mines and Minelike Targets XII
Russell S. Harmon; J. Thomas Broach; John H. Holloway, Editor(s)

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