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Near infrared diode laser spectroscopy of organic compounds in turbid aqueous solutions

  • Diffuse reflectance measurements and photon migration studies with near infrared (NIR) diode lasers were employed to elucidate experimental methods for determining absorption and scattering coefficients and species concentrations in highly scattering solutions. Applicability of theoretical approaches were established by investigating model systems with absorbing (e.g. ink, malachite green) and scattering (e.g. milk powder, caolinit) species in aqueous solution. While diffuse reflectance measurements practically requires calibration procedures, photon migration studies allow quantitative determination of absorption and scattering coefficients of turbid solutions consistent with absorptions coefficients obtained from Lambert-Beer's law. Furthermore, NIR absorption spectra of water, chlorinated hydrocarbons (chloroform, 1,2-dichloroethane, trichloroethene) and of various sugars ($alpha$-D-glucose, sucrose, maltose) are discussed. Spectral variations of NIR water absorption with temperature and solvents are exammined. Exemplary, NIR diodeDiffuse reflectance measurements and photon migration studies with near infrared (NIR) diode lasers were employed to elucidate experimental methods for determining absorption and scattering coefficients and species concentrations in highly scattering solutions. Applicability of theoretical approaches were established by investigating model systems with absorbing (e.g. ink, malachite green) and scattering (e.g. milk powder, caolinit) species in aqueous solution. While diffuse reflectance measurements practically requires calibration procedures, photon migration studies allow quantitative determination of absorption and scattering coefficients of turbid solutions consistent with absorptions coefficients obtained from Lambert-Beer's law. Furthermore, NIR absorption spectra of water, chlorinated hydrocarbons (chloroform, 1,2-dichloroethane, trichloroethene) and of various sugars ($alpha$-D-glucose, sucrose, maltose) are discussed. Spectral variations of NIR water absorption with temperature and solvents are exammined. Exemplary, NIR diode laser detection of water in acetone/water mixtures is performed.show moreshow less

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Metadaten
Author:Frank Schael, Oliver Reich, Hans-Gerd LöhmannsröbenGND
ISBN:0-9528666-1-7
Document Type:Article
Language:English
Year of first Publication:2000
Year of Completion:2000
Release Date:2017/03/24
Source:Near infrared spectroscopy : proceedings of the 9th conference / Hrsg.: Anthony M. C. Davies ; Roberto Giangiacomo. - Chichester : NIR Publications, 2000. - ISBN 0-9528666-1-7. - S. 183 - 189
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Institution name at the time of publication:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physikalische Chemie und Theoretische Chemie