University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Spectroscopy

Classification: Spectroscopy -> derivative

Citations 3

"A UV Spectroscopic Method For Monitoring Aromatic Hydrocarbons Dissolved In Water"
Anal. Chim. Acta 2000 Volume 422, Issue 2 Pages 187-198

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F. Vogt, M. Tacke, M. Jakusch and B. Mizaikoff

Abstract: An enhanced UV spectrometric method is applied to trace measurements of aromatic hydrocarbons dissolved in water. This approach gains selectivity and sensitivity by the use of optically generated first and second derivatives of transmission spectra. The augmented spectroscopic technique is combined with chemometric algorithms like principal component regression or partial least squares which are used for calibration of the spectrometer and quantitative evaluation of spectra. Laboratory measurements were performed on mixtures containing up to five substances, i.e. benzene, toluene, ethylbenzene, the three xylene isomers, chlorobenzene, and gasoline. Due to the difficulty of preparing precisely defined calibration and test samples of these very volatile compounds, a novel mixing device was developed and is presented. From these first investigations it can be estimated that the detection limits are down to ~10 µg analyte per liter of water by using a 10 cm absorption pathlength and a few minutes measurement time.
Hydrocarbons, aromatic Benzene Chlorobenzene Ethylbenzene Toluene 4-Xylene 2-Xylene 3-Xylene Waste Sequential injection Chemometrics Optimization

"Simultaneous Kinetic Spectrophotometric Determination Of 2-furfuraldehyde And 5-hydroxymethyl-2-furfuraldehyde By Application Of A Modified Winklers Method And Partial Least-squares Calibration"
Analyst 1995 Volume 120, Issue 10 Pages 2567-2571

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Isabel Durán Merás, Anunciación Espinosa Mansilla and Francisco Salinas López

Abstract: A method is described for the simultaneous determination of 2-furfuraldehyde and 5-hydroxymethyl-2-furfuraldehyde; based On their reaction by a modified Winkler's method. A comparative study of the results found using the kinetic curves registered at 550 and 585 nm, as analytical signals, has been performed, The data set of the kinetic curves at 550 nm was selected as the analytical signal, Partial least squares (calibrating for a single chemical constituent at a time: PLS-1) multivariate calibration was then applied for the determination, The proposed method was satisfactorily applied to the analysis of wines, spirits, fruit juices and honey. (31 references)
2-Furaldehyde 5-Hydroxymethyl-2-furaldehyde Beverage Wine Fruit Food Calibration Kinetic Multicomponent Multivariate calibration Partial least squares

"Technical Principle Of Flow Injection Derivative Flame Atomic Absorption Spectrometry"
Hebei Daxue Xuebao (Ziran Kexue Ban) 1998 Volume 18, Issue 4 Pages 354-358

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Sun Hanwen Luo Xiao Zhang Deqiang

Abstract: A kinetic model of flow injection-derivative-flame atomic absorption spectrometry was developed based on treatment of the signal of FI-FAAS. The kinetic equation of flow injection-derivative-flame atomic absorption spectrometry was obtained. The derivative absorbance is a linear relation with the analyze concentration.
Signal processing