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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Flame ionization

Classification: Flame ionization

Citations 2

"Determination Of Solubilities Of Organic Solutes In Supercritical Carbon Dioxide By Online Flame Ionization Detection"
Anal. Chem. 1995 Volume 67, Issue 2 Pages 273-279

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David J. Miller and Steven B. Hawthorne

Abstract: A simple and rapid method has been developed to determine the solubility of organic compounds in supercritical C02 by coupling a saturation cell directly to a flame ionization detector. After temperature equilibration, the detector's response to cell pressure changes is rapid, which allows several solubility determinations to be performed per hour. Solubilities determined by this method are in good agreement with published data obtained from gravimetric or spectroscopic methods for anthracene and tripalmitin. The estimated detection limit for this method is <1 x mol/mol, with day-to-day reproducibilities of under 5% (relative standard deviation). solubility increases with raising temperature from 40 to 200 'C (at constant pressure) are usually larger for the above solutes than solubility increases with raising pressure from 150 to 400 bar (at constant temperature).
Organic compounds Supercritical fluid

"Automatic Determination Of N-methylcarbamate Pesticides By Using A Liquid Liquid Extractor Derivatization Module Coupled Online To A Gas Chromatograph Equipped With A Flame Ionization Detector"
J. Chromatogr. A 1993 Volume 633, Issue 1-2 Pages 169-176

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E. Ballesteros, M. Gallego and M. Valc&aacute;rcel

Abstract: A continuous extraction system for the continuous introduction of carbamate pesticide derivatives into a gas-liquid chromatograph was developed. The hydrolysis products of aryl N-methylcarbamates (phenols) were extracted with or without derivatization in a continuous fashion by using ethyl acetate or acetic anhydride in n-hexane, respectively. The acetylated phenolic portion of N-methylcarbamates is highly selective, which was taken advantage of to identify six pesticides (propoxur, carbofuran, carbaryl, aminocarb, benthiocarb and methiocarb). The chromatographic responses obtained were linear between 0.2 and 160 mg/l of the different N-methylcarbamates, and the relative standard deviation was 1.9-3.9%.
Carbamates, N-methyl Pesticides Solvent extraction Pre-column derivatization Pre-column extraction Apparatus