The pyrolysis ofTNT and other explosive compounds generates signature compounds that can be efficiently detected by electrochemical sensors. This concept was implemented in the development and testing ofa sensor probe for the Site Characterization and Analysis Penetrometer System (SCAPS) for the in situ detection ofTNT, RDX, HMX, and other nitrogencontaining soil contaminants. This paper describes the results oflaboratory studies and field tests conducted to determine the feasibility ofemploying electrochemical sensors for detecting subsurface explosives contaminants. A method for the in situ pyrolysis ofexplosives contaminants in soils was developed, and laboratory tests determined that electrochemical sensing of the pyrolysis products was sensitive, selective, reversible, and capable ofbroad dynamic range. A penetrometer probe that accommodates the electrochemical sensors (including power supply and signal conditioning electronics), the pyroiyzer unit, the pneumatic components, and geophysical sensors for soil classification was designed and fabricated. Results oftests conducted at the Louisiana Army Ammunition Plant during September 1994, which demonstrated the performance ofthe SCAPS sensor under actual field conditions, are presented.
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