Investigations of the effects of surface roughness on the utility of grazing-angle Fourier transform infrared reflection absorption spectroscopy (IRRAS) as a method for quantifying trace contamination of metal surfaces have been extended to acetaminophen, a model active pharmaceutical agent, on 316 stainless steel. The effects are more complicated than for the surfactant sodium dodecyl sulfate (SDS) on stainless steel; they include a strong surface-finish dependence of sensitivity and nonlinear behavior at surface loadings above ∼1–2 μg cm−2. Using data from samples in the loading range 0–0.5 μg cm−2, unbiased partial least squared calibrations can be readily achieved for individual surface finishes with detection limits of LD ≈ 0.15 μg cm−2. However, as found for SDS on stainless steel, models built using data from samples of mixed surface roughness are more problematic.
Vol. 3, Iss. 4 Virtual Journal for Biomedical Optics
Benjamin B. Perston, Michelle L. Hamilton, Peter W. Harland, Mary A. Thomson, Peter J. Melling, and Bryce E. Williamson, "Fiber-Optic Infrared Reflection Absorption Spectroscopy for Trace Analysis on Surfaces of Varying Roughness. Part II: Acetaminophen on Stainless Steel," Appl. Spectrosc. 62, 312-318 (2008)