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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Thermometry

Classification: Thermometry

Citations 5

"Double Indication In Catalytic-kinetic Analysis: Simultaneous Photometric And Thermometric Indication Of The Iodide-azide Reaction In Closed And Flow Systems"
Anal. Chim. Acta 1979 Volume 107, Issue 1 Pages 301-307

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Herbert Weisz, Wolfgang Meiners and Guenter Fritz

Abstract: The iodine-azide reaction catalyzed by sulphur-containing compounds is followed simultaneously by optical and thermometric measurements in closed and flowing systems. In the closed system, thiosulphate can be determined in the range 32.4-324 µg mL-1, by observing the turbidity caused by the nitrogen formed during the reaction and the temperature changes. With the flow apparatus, thiosulphate can be determined in the range 112-1120 µg mL-1 by continuously mixing the sample and reagent solutions. H2S in nitrogen 5-100 ppm) is measured by sweeping the gas into the reaction Cuvette. In a third flow procedure, H2S is liberated continuously from sodium sulphide solutions (0.1-10 µg S2- mL-1) by ascorbic acid, and swept to the measuring cuvette with nitrogen.
Thiosulfate ion Catalysis Kinetic Closed loop

"Thermometric Determination Of Copper(II) Using Acid Urease"
Analyst 1996 Volume 121, Issue 11 Pages 1717-1720

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Claudia Preininger and Bengt Danielsson

Abstract: A flow injection enzymatic-thermometric method for Cu determination is described. A portion (0.5 ml) of 0.5 M urea was injected into a carrier stream (0.9 ml/min) of 0.1 M maleate buffer of pH 6 in a flow injection manifold (schematic shown). The mixture was passed through a column of acid urease immobilized on controlled-pore glass (preparation described) and the heat produced was measured with a Wheatstone bridge. Then, 0.5 mL Cu solution was injected into the system for 0.5 min to inhibit the enzyme. After 5 min, a further portion (0.5 ml) of 0.5 M urea was injected into the system and the heat produced by the urea/urease reaction was measured. The percentage inhibition was calculated from the peak heights before and after Cu injection, and was used for quantification of Cu(II). The calibration graph was linear up to 0.1 mM Cu(II), the detection liwas 0.32 ppm and the RSD (n = 5) was 4%.
Copper Controlled pore glass

"Kinetic Determinations And Some Kinetic Aspects Of Analytical Chemistry"
Anal. Chem. 1990 Volume 62, Issue 12 Pages 441R-461R

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Horacio A. Mottola, Dolores Perez-Bendito, and Harry B. Mark

Abstract: A review is presented, with 370 references, on kinetic methods based on, e.g., flow injection, thermometric titration, photometric monitoring, electrode reactions and luminescence.
Kinetic Titrations Review

"Thermometric Sensing Of Fluoride By Adsorption On Ceramic Hyroxyapatite Using Flow Injection Analysis"
Anal. Commun. 1997 Volume 34, Issue 11 Pages 329-332

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Salah Salman, Karsten Haupt, Kumaran Ramanathan and Bengt Danielsson

Abstract: A thermometric method for detection of fluoride has been developed that relies on the specific interaction of fluoride with hydroxyapatite. The detection principle is the measurement of the enthalpy change upon adsorption of fluoride onto the ceramic hydroxyapatite by temperature monitoring using a thermistor-based flow injection calorimeter. The detection limit for fluoride was 5 M (0.1 ppm) which is in the same range as that of a commercial ion-selective electrode. The method could be applied to fluoride in aqueous solution as well as in cosmetic preparations. The system yielded highly reproducible results over at least 6 months without the need for replacing or regenerating the ceramic hydroxyapatite column. The ease of operation of thermal sensing and the ability to couple the system to flow injection analysis provides a versatile, low-cost and fast detection method for fluoride.
Fluoride Solid phase detection

"Microprocessor-controlled Continuous-flow Thermal Detector"
Magy. Kem. Lapja 1985 Volume 40, Issue 12 Pages 509-511

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Molnar, M.;Inczedy, J.

Abstract: Details are given of the construction of the analyzer., and block diagrams of the flow system and the digital electronic circuit are given. Parameters of the analyzer. were optimized by using a personal computer to establish the effects of flow rate and of the volume of the mixing cell.
Computer Optimization