WWRC 94-13
Adsorption of Chlorinated Ethylenes at 1-Octadecanethiol-modified Silver Surface
Abstract
The adsorption of chlorinated ethylenes at octadecylthiol-modified
surface-enhanced Raman spectroscopy (SERS) substrates was examined.
It was found that the adsorption could
be followed with SERS and the adsorption isotherms could be
fit to a Frumkin isotherm. In order to better understand
variations in the isotherms between substitutions of the
chlorinated ethylenes, an isotherm that utilizes an adsorption
parameter analogous to the Hildebrand solubility parameter
was developed. The adsorption parameters were found to
qualitatively follow the solubility parameters. The detection
limits were calculated and range from 2086 ppm for
trans-1,2-dichloroethylene to 12.6 ppm for tetrachloroethylene. A
linear free-energy relationship was found for the log K,
adsorption equilibrium constant, and the log S, aqueous
solubility, of these compounds. This relationship allows one
to predict the detection limit for low aqueous solubility organic
compounds.
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