''Novel Optical Detection Schemes for In-Situ Mapping of Volatile Organochlorides in the Vadose Zone''

Angel, S. Michael ; Gribb, Molly M.

Department of Chemistry and Biochemistry, The University of South Carolina, Columbia, SC

关键词: Hydrocarbons;    Lawrence Livermore National Laboratory;    37 Inorganic, Organic, Physical And Analytical Chemistry;    54 Environmental Sciences;    Cones;   

DOI  :  10.2172/833498
RP-ID  :  EMSP-70050--2001
RP-ID  :  FG07-99ER62881
RP-ID  :  833498

美国|英语

来源: UNT Digital Library

【 摘 要 】

Long-term objective is to develop a system for measuring and identifying a wide range of volatile organic hydrocarbons, including aromatics, carbon tetrachloride, TCE and other organochlorides, at ppb levels in-situ in the subsurface (''at-depth'') using a fiber-optic REMPI probe in a cone penetrometer. Specific focus of much of the proposed work is to identify and optimize those experimental parameters which effect the in-situ determination of organic molecules in the subsurface using resonance-enhanced multi-photon ionization (REMPI). Emphasis is placed on visible excitation so that the high transmission of fiber-optics at visible wavelengths can be fully utilized. A fiber-optic REMPI system is being designed and integrated into an existing cone penetrometer system at LLNL. The design will be compatible with existing Raman and fluorescence probes.