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Attenuated Total Reflectance Spectra of Colloidal and Particulate Silica Samples in Aqueous Media

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We have measured and compared ATR/FT-IR spectra of aqueous dispersions of colloidal silica, and aqueous suspensions of particulate silica, over ranges of bulk concentrations using CIRCLE® and Contact Sampler™ cells. Procedures are described for quantitative analyses of each silica type. Detection limits are approximately 0.001% for the particulate species. The spectra of particulates are distorted by refractive-index effects to low frequency of the main analytical bands around 1090 cm−1, but the distortions are proportional to concentration and do not interfere with the precision of analyses. We recommend either ATR cell, but the Contact Sampler™ is more convenient.

Keywords: ATR/FT-IR; Aqueous particulate dispersions; Colloidal silica

Document Type: Research Article


Affiliations: Department of Chemistry, Saint Francis Xavier University, Antigonish, Nova Scotia B2G 1C0, Canada

Publication date: July 1, 1991

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