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This paper deals with the use of FT-IR diffuse reflectance measurements for the monitoring of silane-treated naturally occurring kaolin clays. We show quantitative results for three of the most common silanized clays including precision and accuracy data obtained from neat, unprocessed samples. No Kubelka-Munk correction was required since the Δlog (1/ R) values measured were very low, as determined by comparison with Kubelka-Munk corrected data.

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The use of infrared spectroscopy in trace analysis can be greatly aided by employing preconcentration and/or separation techniques for appropriate samples. In some cases, classical infrared difference spectroscopy or computer treatment of data will be sufficient to identify qualitatively or to quantitate a trace component in a complex mixture. Analysis of aromatic isomers, gasoline additives, drugs, and polymer additives will be described to illustrate the methods.