The effect of surface roughness on the analytical performance of a fiber-optic grazing-angle infrared reflection absorption spectroscopy (IRRAS) system has been investigated. The instrument was used to develop calibrations to quantify trace surface loadings for sodium dodecyl sulfate
(SDS) on 316 stainless steel with three different surface finishes. Partial least squares (PLS) calibrations were developed for both individual finishes and combinations of finishes. For SDS on individual surface finishes, the root mean square (rms) error of cross-validation (RMSECV) varied
between 0.08 and 0.12 μg cm−2 with values of R2 between 0.89 and 0.96. A combined model for SDS on all surfaces gave an RMSECV of 0.18 μg cm−2 with an R2 of 0.85.
Department of Chemistry, University of Canterbury, Christchurch, New Zealand 2:
Remspec Corporation, Sturbridge, Massachusetts 01507
Publication date: May 1, 2006
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