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NIR Fiber-Optic Method with Multivariate Calibration Analysis for Determination of Inorganic Compounds in Aqueous Solutions

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Abstract:

Near-infrared spectra of aqueous solutions were collected by using evanescent-field fiber-optic sensors. The spectra of two- and four-electrolyte solutions were analyzed with a partial least-squares (PLS) algorithm to quantify the measurements. Our results indicate that the electrolytes can be identified and simultaneously determined by using the PLS calibration model. Electrolytes in opaque aqueous mixtures were also studied, and the results are compared with results from clear aqueous solutions.

Keywords: AQUEOUS SOLUTIONS; EVANESCENT FIELD; FIBER-OPTIC SENSORS; NEAR-INFRARED; OPAQUE SOLUTIONS

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702001948583

Affiliations: Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720

Publication date: October 1, 2000

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