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
Website: @unf

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Inorganic compound

Classification: Inorganic compound -> zinc oxide

Citations 2

"Catalytic Determination Of Manganese At Ultratrace Levels By Flow Injection Analysis"
Analyst 1986 Volume 111, Issue 1 Pages 69-72
S. Maspoch, M. Blanco and V. Cerdá

Abstract: The catalytic effect of Mn(II) on the oxidation of succinimide dioxime in alkaline medium was used for determination of Mn(II) by flow injection analysis with photometric detection at 695 nm. Variation of the reaction temperature between 25°C and 45°C allows the determination range to be extended from 0.2 to 1300 ng mL-1, with a sampling frequency of 45 h-1 and a coefficient of variation of 1.3 to 1.0%. Injection of the sample in a flow of EDTA solution overcomes most interference. Interference by Co(II), Fe(II) and Mg(II) was investigated. The method was used to determine Mn in reagent-grade ZnO and HClO4 and in powdered coffee and rice.
Manganese(II) Spectrophotometry Catalysis Heated reaction Interferences Optimization Ultratrace

"Studies On The Synergic Effects Of Metal Cations On Kinetic Reactions And Their Analytical Applications"
Microchem. J. 1996 Volume 53, Issue 3 Pages 376-384
Jianhua Wang and Ronghuan He

Abstract: The mutual catalytic (synergic) effect between closely related metal cations such as Mo(VI) and W(VI), Ag(I) and Hg(II) and Fe(II) and Sb(III) on different kinetic reaction systems viz. Cr(VI)/iodide, H2O2/iodide and thiourea activated hexacyanoferrate (II)-α,α-bipyridyl, respectively, was studied spectrophotometrically with a stopped-flow-FIA technique. A synergic catalytic coefficient (D) was defined and a method for the simultaneous determination of the components in binary mixtures was proposed (theory and details given) by introducing the coefficient D into the reaction systems to compensate for the deviations of absorbance from additivity. Portions of standard metal ion solutions were injected into a carrier stream of an FIA manifold (schematic shown) and mixed with reagent streams at 3 ml/min in a reaction coil (250 mm) [experimental details given]. The colored complex formed was detected by the method of Wang and He spectrophotometrically. (Anal. Chim., 1993, 276, 419). Under optimized conditions (tabulated), calibration graphs were linear up to 3.7, 3.5, 1.1 and 2 µg/ml, respectively, for Sb(III), Fe(II), Mo(VI) and W(VI) and up to 210 and 195 ng/ml, respectively, for Hg(II) and Ag(I). The method was applied to the analysis of Mo and W in steel, Fe(II) and Sb in a zinc standard and Hg and Ag in tap water. Results agreed well with listed values.
Antimony(3+) Iron(2+) Molybdenum(VI) Tungsten(VI) Mercury(II) Silver(I) Spectrophotometry Kinetic Stopped-flow Optimization