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Water in Acetic Acid & p-Xylene with a ChemView® Filter Photometer

From Guided Wave, Inc.
 

 

Challenge: Can quantitative analysis be done with a multiple wavelength filter photometer? Background: The spectra of this 3-component mixture are complex. Initial visual inspection suggests that a complete spectrum and multivariate analysis (PLS - partial least-squares) are required.

Experimental: Spectra were taken with an Optical Solutions' PS-2 InGaAs diode array spectrometer with GRAMS32™ software and 2 meters of low-OH optical fibers. Thirteen samples were analyzed in Optical Solutions' HeaterCellÔ fiber-optic accessory at 50 °C in a 5 mm quartz cuvette Results: A PLS model was created using PLSPlus/IQ™ (Galactic Industries) within GRAMS/32™. The results show reasonable predictions in the table below. PLS uses the complete spectrum for quantitative analysis. It is apparent from the spectra, however, that water can be analyzed near 1380 nm, independent of pxylene or acetic acid content. Multiple linear regression (MLR) systematically investigates which wavelength or wavelengths provide a statistically acceptable calibration.

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