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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Pump programming

Classification: Parameter -> Pump programming

Citations 3

"Rapid Automated Determination Of Constants Of Solubility Product And Critical Micelle Concentrations By The Flow-rate Gradient Technique"
Talanta 1993 Volume 40, Issue 3 Pages 391-398
Juliana Marcos, Angel Ríos and Miguel Valcárcel,

Abstract: The FIA apparatus consists of two peristaltic pumps. Pump A is controlled by a Commodore 64 microcomputer and is used to produce flow rate gradients. Pump B operates at constant flow rates. The fluids pumped through the system are mixed in a reactor coil and then passed through a conductivity detector. To determine the constants of solubility product of various inorganic salts, suspensions of the insoluble compounds are pumped through pump A and water is pumped through pump B. The conductivity of the resulting mixture is monitored. As the flow rate from pump A is increased, a concentration. is reached when the insoluble compound no longer dissolves in the water. This critical concentration. is determined by a change in slope of the conductivity - flow rate graph and is used to calculate the constant of solubility product (equations given). A similar approach is used to determine the constants of solubility product for metal hydroxides. To determine critical micelle concentration. of surfactants solutions, pump A feeds high concentration. of the surfactant through the system while water passes through pump B.
Critical micelle concentration Surfactants

"Flow Injection Analysis As A Tool For Metal Speciation"
Am. Lab. 1984 Volume 16, Issue 7 Pages 17-18
Pacey, G.E.;Bubnis, B.P.

Abstract: The usefulness of flow injection analysis in automated systems (with pump programming and 'packed-bed' reaction coils) is described for the rapid processing of large numbers of samples. The importance of metal speciation in environmental and toxicological studies is emphasized and, as an example, a flow injection method for determination of Fe(II) and Fe(III) with use of 1,10-phenanthroline and spectrophotometry at 512 nm is described; it was suitable for application in the range 5 to 30 ppm of each species.
Iron(2+) Iron(III) Environmental Spectrophotometry Spectrophotometry

"Design And Operation Of An Autosampler-controlled Flow Injection Preconcentration System For Lead Determination By Flame Atomic Absorption Spectrometry"
J. Autom. Methods Manag. Chem. 1989 Volume 11, Issue 1 Pages 36-39
S. R. BYSOUTH, J. F. TYSON, and P. B. STOCKWELL

Abstract: The design and operation of simple flow injection manifolds for the pre-concentration. of Pb are described. The manifolds make use of glass columns (4 cm x 2.5 mm) contained within the sample loop of an injection valve, and the valves and pump of the system are controlled by an autosampler via an interface. The effects were studied of sample flow rate, pre-concentration buffer type and pH, and optimum eluent concentration. and flow rate. Detection limits ranged from 2.8 to 1.4 ng mL-1, representing an improvement in sensitivity of ~50 times that obtained by manual methods.
Lead Spectrophotometry