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RECORD NUMBER: 1055 OF 1150

OLS Field Name OLS Field Data
Main Title Tetrachlorodibenzodioxin Isomer Differentiation by Micro Diffuse Reflectance Fourier Transform Infrared Spectrometry at the Low Nanogram Level.
Author Gurka, D. F. ; Billets, S. ; Brasch, J. W. ; Riggle, C. J. ;
CORP Author Environmental Monitoring Systems Lab., Las Vegas, NV.;Battelle Columbus Labs., OH.
Year Published 1985
Report Number EPA/600/J-85/380;
Stock Number PB86-187150
Additional Subjects Infrared spectroscopy ; Identifying ; Sensitivity ; Reflectance ; Environments ; Reprints ; Dibenzodioxin/tetrachloro ; Dioxins(Herbicides) ; Fourier transform spectroscopy ; Isomers
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB86-187150 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 7p
Abstract
Infrared diffuse reflectance spectra were recorded for the 22 tetrachlorodibenzodioxin isomers (TCDDs). By use of micro-DRIFT techniques and signal averaging, identifiable spectra for each of the isomers were achieved at low nanogram levels. Spectral features in the 1200/cm to 1600/cm region indicate that each isomer has a unique spectrum and is readily distinguishable from other isomeric TCDDs. Each TCDD isomer was correctly identified, from a user-created library of the 22 isomers, using a software algorithm. The uniqueness of the TCDD FT-IR spectra offers the previously unobtainable possibility of correct isomer identification, in the presence of isomeric chromatographic coelution interferences, by spectral subtraction. These DRIFT spectra were utilized to clarify ambiguous TCDD structural assignments. Utilization of these FT-IR techniques for environmental monitoring can complement the current procedure of gas chromatography/mass spectrometry (GC/MS) for dioxin characterization. (Copyright (c) 1985 American Chemical Society.)