Determination of vanadium in sea water by catalytic adsorptive cathodic stripping voltammetry

Vega, Marisol; Berg, Constant M.G. van den

doi:10.1016/0003-2670(94)00088-3

Cited by 53 publications

(37 citation statements)

References 12 publications

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“…The reverse scan, unlike the one without bromate, yielded a cathodic rather than an anodic peak. Such behavior has also been observed by other researchers [25][26][27] and is typical for a catalytic system. We suggest that the chemical oxidation of Os(VI) to Os(VIII) by bromate was dominant, and that most of the Os(VI) produced by the electrochemical reduction was converted to Os(VIII) at a fast rate.…”

Section: Catalytic Characteristics Of Os(viii)-brosupporting

confidence: 85%

Determination of Ultratrace Amounts of Osmium Using Catalytic Wave of OsO4–Bromate System by Voltammetric Method

Ensafi

Zarei

1999

ANAL. SCI.

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Since osmium is usually present in such materials at low concentration, methods with reasonable or high detectability are required. In addition, osmium is usually present in association with other platinum metals such as Pt, Rh, Ir and Pd; methods are therefore also required to have high selectivity. Various methods have been described for the determination of osmium in different samples including spectrophotometric methods 1-5 , potentiometric 6 , atomic spectrometric methods 7-9 and catalytic spectrophotometric methods.10-15 The poor selectivity or limit of detection of many existing techniques, along with the drawback of requiring a reagent that is not commercially available, has necessitated the development of adequate separation procedures.Voltammetric techniques also have been used for the determination of osmium. [16][17][18][19][20][21][22] used an extraction-voltammetric method for the determination of osmium, with the limit of detection of 0.013 mg/ml osmium. Medyantseva et al. 20 determined osmium by an extraction-Ac polarographic method at 6.1×10 -7 M Os(VIII). Medyantseva et al. 21 used hydrogen catalytic currents in a solution containing osmium with nitrogen and sulfur-containing ligand, with the limit of detection of 1×10 -8 M. A more recent voltammetric method for the determination of osmium is based on its catalytic effect on the iodate oxidation of As(III) in acidic media with oscillopolarographic method. 22 The limit of detection is 0.02 ng/ml osmium. This method is not selective and has much interference. This paper presents a highly sensitive, simple and selective method for the determination of osmium, based on the cathodic catalytic current of Os(VIII)-bromate system near -0.05 V vs. Ag/AgCl reference electrode by linear sweep voltammetric (LSV) and square wave voltammetric (SWV) techniques. The main advantages of the method are sensitivity, relative selectivity, and use of only readily available reagents. The effect of possible interferences is easily removed by a single extraction of osmium into methyl isobutyl ketone. 9 Osmium is then back-extracted into sodium hydroxide solution 12 and is measured according to the recommended procedure. Experimental ApparatusA Polarographic Analyzer system (EG & G Princeton Applied Research), Model 384B with a three-electrode system, Model 303A (HMDE as a working electrode with area of 1.8 mm 2 , Ag/AgCl, saturated with KCl, as a reference electrode and Pt-electrode as auxiliary electrode) were used. A Model DMP-40 series digital plotter (Houston instrument) was used for recording voltammogram. ReagentsAll chemicals used were of analytical grade and were used without further purification. Doubly distilled water was used for the experiment.A 0.450 mol/l sodium bromate solution was prepared by dissolving 16.988 g of NaBrO 3 (Merck) in water in a 250-ml volumetric flask.Osmium tetroxide stock solution was prepared by dissolving 1.0 g of osmium tetroxide from a sealed Highly sensitive catalytic waves of OsO4-bromate linear sweep voltammetric and square w...

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Section: Catalytic Characteristics Of Os(viii)-brosupporting

confidence: 85%

Determination of Ultratrace Amounts of Osmium Using Catalytic Wave of OsO4–Bromate System by Voltammetric Method

Ensafi

Zarei

1999

ANAL. SCI.

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“…Adsorptive cathodic stripping voltammetry (AdCSV) had been applied to the detection of metals such as Co, Ni, Cu, Mo, U and V. In AdCSV, ligands, such as dimethylglyoxime, 100) catechol, 101,102) cupferron, 103) and chloroanilic acid 104) were chosen for complexation of gallium. Wang and Zadii 98) performed trace quantification of gallium using adsorptive cathodic stripping voltammetry.…”

Section: Adsorptive Cathodic Stripping Voltammetry Of Galliummentioning

confidence: 99%

Electrochemistry of Gallium

Chung¹,

Lee²

2013

Journal of Electrochemical Science and Technology

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:Gallium is an important element in the production of a variety of compound semiconductors for optoelectronic devices. Gallium has a low melting point and is easily oxidized to give oxides of different compositions that depend on the conditions of solutions containing Ga. Gallium electrode reaction is highly irreversible in acidic media at the dropping mercury electrode. The passive film on a gallium surface is formed during anodic oxidation of gallium metal in alkaline media. Besides, some results in published reports have not been consistent and reproducible. An increase in the demand of intermetallic compounds and semiconductors containing gallium gives rise to studies on electrosynthesis of them and an increase of gallium concentration in the environment with various application of gallium causes the development of electroanalysis tools of Ga. It is required to understand the electrochemistry of Ga and to predict the electrochemical behavior of Ga to meet these needs. Any review papers related to the electrochemistry of gallium have not been published since 1978, when the review on the subject was published by Popova et al. In this study, the redox behavior, anodic oxidation, and electrodeposition of gallium, and trace determination of gallium by stripping voltammetries will be reviewed.

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“…Surface catalytic redox reactions are important because they provide the possibility to improve the sensitivity of electroanalytical methods [25,26,27,28,29,30]. Moreover, these electrode reactions are widely exploited for the development of amperometric sensors [31,32,33].…”

Section: Introductionmentioning

confidence: 99%

The surface catalytic mechanism: a comparative study with square-wave and staircase cyclic voltammetry

Mirčeski

Gulaboski

2003

J Solid State Electrochem

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A pseudo-first-order catalytic mechanism in which both reactant and product of a redox reaction are strongly immobilized on an electrode surface is theoretically analysed under conditions of square-wave (SWV) and staircase cyclic voltammetry (SCV). A mathematical procedure is developed under diffusionless conditions. The relationships between the properties of the voltammetric response and both the kinetic parameters of the redox reaction and the parameters of the excitation signal are studied. The phenomenon of the quasi-reversible maximum is discussed. A comparative study between SWV and SCV is presented and the limitations and advantages of both techniques, from analytical and kinetic points of view, are discussed. The theoretical predictions are experimentally confirmed by the redox reaction of azobenzene in the presence of hydrogen peroxide as an oxidizing agent.

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Determination of vanadium in sea water by catalytic adsorptive cathodic stripping voltammetry

Cited by 53 publications

References 12 publications

Determination of Ultratrace Amounts of Osmium Using Catalytic Wave of OsO4–Bromate System by Voltammetric Method

Determination of Ultratrace Amounts of Osmium Using Catalytic Wave of OsO4–Bromate System by Voltammetric Method

Electrochemistry of Gallium

The surface catalytic mechanism: a comparative study with square-wave and staircase cyclic voltammetry

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