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Proceedings Paper

Speciation of complex organic contaminants with Raman spectroscopy
Author(s): Randall T. Bishop; Joseph C. D'Angelo; Timothy W. Collette
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Paper Abstract

Raman spectroscopy was utilized to acquire resolved spectra of the neutral and zwitterion involved in the tautomeric solution equilibrium of 3-hydroxypyridine. As these species exist in varying proportion to one another at different temperatures, spectral measurements across a series of temperatures was required. Previously determined microequilibrium and enthalpy constants allowed the calculation of concentrations at all temperatures. This allowed for the deconvolution of component Raman spectra by multiple linear regression. The spectra are found to be similar, but contain significant structurally related differences, sufficient to distinguish one species from the other. To our knowledge, resolved Raman spectra of tautomers in water has not previously been reported.

Paper Details

Date Published: 10 February 1999
PDF: 12 pages
Proc. SPIE 3534, Environmental Monitoring and Remediation Technologies, (10 February 1999); doi: 10.1117/12.339051
Show Author Affiliations
Randall T. Bishop, U.S. Environmental Protection Agency (United States)
Joseph C. D'Angelo, U.S. Environmental Protection Agency (United States)
Timothy W. Collette, U.S. Environmental Protection Agency (United States)


Published in SPIE Proceedings Vol. 3534:
Environmental Monitoring and Remediation Technologies
Tuan Vo-Dinh; Robert L. Spellicy, Editor(s)

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