WWRC 92-15
Octadecylthiol-Modified Surface-Enhanced
Raman Spectroscopy Substrates: A New Method for the Detection of Aromatic Compounds
Abstract
A method for detection of aromatic organics in
groundwater has been tested. It was found that use of
surface-enhanced Raman scattering and an octadecylthiol
coating on roughened silver produced a system which could
partition the organics out of water into the strongly Raman
enhanced region near the silver surface. The selectivity
of the method was illustrated with the three isomers of
xylene. Sensitivity was tested with benzene and naphthalene.
The detection limits are 7.5 and 2.3 ppm for
benzene and naphthalene, respectively. It was found that
the calibrations followed a Langmuir-type isotherm at low
solution concentrations.
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