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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Potentiometry

Classification: Potentiometry -> chrono

Citations 5

"Determination Of Nickel, Cobalt, Copper And Uranium In Water By Cathodic Stripping Chronopotentiometry With Continuous-flow"
Anal. Chim. Acta 1987 Volume 199, Issue 1 Pages 59-76

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M. P. Newton and C. M. G. Van Den Berg

Abstract: An automated analyzer. with fast data acquisition (250 kHz) is described. Adsorptive collection of surface-active metal complexes on a hanging-mercury-drop electrode is followed by cathodic scans in which a constant current of 0.8 to 60 µA is passed through the working electrode. Copper, U and Ni can be determined in the presence of dissolved O but the sensitivity for Ni is then much reduced, and Co cannot be determined as its peak is superimposed on the O peak. The sensitivity of stripping chronopotentiometry in the presence of dissolved O is similar to that of fast linear-sweep voltammetry in the absence of dissolved O. Detection limits in deaerated seawater are 0.1, 0.1, 1.8 and 1.6 nM for Ni, Co, Cu and U, respectively, using 60-s stirred adsorption and could be lowered further by prolonged collection (300 s). The technique was successfully applied in measuring Ni with continuous-flow in estuarine water.
Nickel Cobalt Copper Uranium Estuarine Sea Interferences

"Potentiometric Stripping With Matrix Exchange Techniques In Flow Injection Analysis Of Heavy Metals In Groundwaters"
Anal. Chem. 1983 Volume 55, Issue 2 Pages 320-328

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Alex Hu, Raymond E. Dessy, and Anders Graneli

Abstract: Potentiometric stripping analysis, in conjunction with flow injection analysis techniques, provides a convenient automated method for the determination of Cu, Cd, and Pb in groundwater. The theory behind the method is developed, and the hardware, software, and instrumentation required are presented. Application to real groundwater samples provides a comparison with previously described techniques. The separation of nearby oxidation peaks in potentiometric stripping analysis can be effected by matrix exchange techniques which involve plating in one environment and stripping in another. Flow injection analysis provides a convenient mechanism to automate this process. Heavy metals commonly found in groundwater, such as Pb, TI, Cd, Bi, Cu, and Sn, are studied by using this technique to explore the scope and limitations of the method.
Copper Cadmium Metals, heavy Lead Ground Theory

"Flow-through Stripping Chronopotentiometry For The Monitoring Of Mercury In Waste Waters"
Fresenius J. Anal. Chem. 1998 Volume 362, Issue 2 Pages 201-204

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E. Beinrohr A, J. Dzurov A, J. Annus A, J. A. C. Broekaert

Abstract: A simple method for the determination of total mercury in waste waters is described. It makes use of a flow system incorporating a wall-jet cell equipped with a gold working electrode. The untreated sample is mixed on-line with the acidic carrier electrolyte which contains potassium permanganate and transforms the various species of mercury, especially elementary Hg, to Hg(II). The pre-treated solution enters the cell where mercury is deposited on the gold electrode. In the next step the deposit is stripped at constant current and the time corresponding to the dissolution of the deposit is obtained from the chronopotentiometric signal. The method enables it to determine and monitor Hg in the concentration range of 1 to 1000 wg/L in 5 min intervals.
Mercury Waste

"Study On Cobalt-PTFE Composite-plated Electrode And Its Electrochemical Properties"
Microchem. J. 1996 Volume 53, Issue 4 Pages 385-394

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Hongding Xu, Mingzhu Zou, Qinhua Ru and Yunjing Luo

Abstract: A Ni disc electrode and a Co plate (0.196 cm2) were placed in an electroplating bath of pH 4-4.2 and 62±1°C. For the Co layer deposition, the bath contained 10.8 g CuSO4/NaCl/boric acid (10:1:1) in 40 mL water at 40 mA/cm2 and 9°C. For the Co-PTFE layer, the bath was 9.525 g CuSO4/NaCl/boric acid (3:10:1) in 30 mL water at 30 mA/cm2 and 1.5 C. The electroplating was carried out using a PAR173/179 potentiostat-coulometer. The resulting electrode surface was characterized by XPS and scanning electron microscopy. The chronoamperometric responses of this electrode to alcohols were studied. The electrode was also used in an FIA system with Ag and Pt wire reference and auxiliary electrodes, respectively. The responses to vitamins, amino-acids and monosaccharides were studied. The method was also applied to drug tablet analysis. The surfaces of the composite-plated electrode were smooth and uniform with PTFE particles embedded in the plated layer. The linear calibration graphs for fatty alcohols are given; detection limits were 1-10 mM. Calibration graphs were linear for the several biochemical compounds tested (ranges given); detection limits were from 1 µM-0.1 mM; RSD were 0.12-1.78%. Recoveries were from 95-105% vitamin B2 (riboflavine) in tablets.
Riboflavine Pharmaceutical Apparatus

"Determination Of Copper(II) And Lead(II) In Flow Systems By Stripping Chronopotentiometry"
J. Anal. Chem. 1993 Volume 48, Issue 7 Pages 1151-1157

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Myasoedov, B.F.;Krivoshei, E.M.;Kamenev, A.I.

Abstract: The continuous-flow electrochemical cell of the chronopotentiometer comprised a cell (0.1 ml) with an indicator electrode made from graphite fibers (specific surface ~1 m2/g), with a total working end face of 0.25 mm2. A potential of 0.4 V was applied to the electrode. The cell incorporated a Pt wire auxiliary electrode, with Ag/AgCl as reference electrode. The supporting electrolyte was 0.01-0.03 M HCl and the flow rate was ~10 ml/min. Sample (500 µL) was injected into the supporting electrolyte through a nozzle (0.3 mm diameter) 1 mm from the working surface of the indicator electode. A current of 3 µA was passed through the cell. The procedure was suitable for the determination of Pb (0.5-100 µM) in the presence of 10 µM-Cu, and Cu (1-100 µM) in the presence of 10 µM-Pb.
Copper(II) Lead(2+) Detector Instrumentation