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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Larry R. Snyder

Abbrev:
Snyder, L.R.
Other Names:
Address:
Technicon Instruments Corporation, Tarrytown, NY 10591 USA
Phone:
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Citations 5

"Reaction Colorimeters As Detectors In High Performance Liquid Chromatography. Extra-column Band Broadening With Segmented Flow-through The Reaction Coil"
J. Chromatogr. A 1976 Volume 125, Issue 1 Pages 287-306
L. R. Snyder

Abstract: A theoretical expression for extra-column band broadening in reaction colorimeters for liquid chromatography is presented, assuming air-segmentation of the column effluent. The effect of different variables on such band broadening is examined, and conditions for minimizing band broadening are defined. It is shown that reaction colorimeters with holdup times of up to 20 min are compatible with high-performance liquid chromatographic systems, using, for example, 5-10 m particles as column packings.
HPLC Spectrophotometry Theory Diffusion Air segmentation

"Automated Chemical Analysis: Update On Continuous-flow Approach"
Anal. Chem. 1976 Volume 48, Issue 12 Pages 942A-956A
Lloyd Snyder , Jacob Levine , Robert Stoy , Aldo Conetta

Abstract: A review with 18 references describing the use of continuous-flow analysis systems in clinical biochemical and comparing these systems with discrete and centrifugal automated systems.
Theory Review Air segmentation

"Dispersion In Segmented Flow-through Glass Tubing In Continuous-flow Analysis: The Non-ideal Model"
Anal. Chem. 1976 Volume 48, Issue 7 Pages 1022-1027
L. R. Snyder and H. J. Adler

Abstract: The "ideal" model of sample dispersion in the flow of air-segmented liquid streams through open tubing is expanded here to include the effects of slow mixing within moving liquid segments. The resulting "non-ideal" model allows prediction of sample dispersion in segmented flow over a broad range of experimental conditions. Comparison of experimental dispersion data with values calculated from the non-ideal model shows excellent agreement. The design of continuous-flow (AutoAnalyzer) systems for minimum dispersion and sample interaction, and/or maximum analysis rates can now be done theoretically, rather than empirically as in the past.
Theory Dispersion Air segmentation Modeling

"Dispersion In Segmented Flow-through Glass Tubing In Continuous-flow Analysis: The Ideal Model"
Anal. Chem. 1976 Volume 48, Issue 7 Pages 1017-1022
L. R. Snyder and H. J. Adler

Abstract: Sample dispersion or carryover in the flow of air-segmented liquid streams through open tubing is of broad analytical importance, and especially so in the technique of continuous-flow (AutoAnalyzer) analysis. A detailed model for the prediction of such dispersion under certain limiting conditions of practical interest is rederived, expanded, and experimentally verified. This so called "ideal" model assumes perfect mixing within each moving liquid segment.
Theory Dispersion Air segmentation Modeling

"Continuous-flow Analysis: Present And Future"
Anal. Chim. Acta 1980 Volume 114, Issue 1 Pages 3-18
L. R. Snyder

Abstract: The present and probable future performance of continuous-flow analysis is discussed in terms of design considerations and new analytical modules. Comparison of throughput rates and reagent/sample consumption with the competitive technique of flow-injection analysis shows that the latter is better suited for very simple processing schemes that require only a small dwell time (e.g., 5 s or less) within the flow system. For more complicated manipulation of sample and/or longer reaction times, continuous flow analysis generally has a substantial advantage with respect to analysis rate, reagent consumption and required sample size.
Theory Review