Catalytic stripping voltammetry of vanadium in the presence of dihydroxynaphthalene and bromate

Li, Hong; Smart, Ronald B.

doi:10.1016/0003-2670(96)00252-8

Cited by 23 publications

(33 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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.

View full text Add to dashboard Cite

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...

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…The composition of the V(V)-ARS complex was determined by the mole ratio method to be 1 : 2. It was found that Pc 1 decreased with increasing the V(V) concentration and disappeared nearly when the concentration of V(V) was higher than half that of ARS, and Pc 2 did not be affected by the addition of bromate, in contrast to the previous observations [2,5,9,10,11,13,14] where the response signal for the V(V) complexes was enhanced catalytically in the presence of bromate. Moreover, the peak potential (E p ) of Pc 2 shifted toward more negative values with increasing scan rate (u).…”

Section: Methodscontrasting

confidence: 67%

“…This technique is based on adsorptive accumulation of a complex of the element with an added specific ligand on an electrode surface followed by electrochemical reduction of either the element or the ligand in the complex. Different ligands, such as catechol [1 -2], 5-Br-PADAP [3 -5], solochrome violet RS [6], 2-(2-thiazolylaloz)-p-cresol [7], pyrogallol [8], cupferron [9 -10], 2,3-dihydroxynaphthalene [11] and chloranilic acid [12 -13], have been used for the adsorptive voltammetric determination of vanadium. Several of these procedures involve a catalytic enhancement of the response in the presence of bromate [2,5,9,10,11,13].…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Vanadium by Adsorptive Stripping Voltammetry at a Carbon Paste Electrode

Wang

Huang

2008

Electroanalysis

View full text Add to dashboard Cite

A method for the voltammetric determination of vanadium using a carbon paste electrode (CPE) was described. The new procedure is based on the adsorptive accumulation of the V(V)-alizarin red S(ARS) complex onto the surface of the CPE, followed by the electrochemical reduction of adsorbed species. The optimal experimental conditions include the use of 0.10 mol/L acetate buffer (pH 5.1), 1.0 Â 10 À5 mol/L ARS, an accumulation potential of À 0.10 V (versus SCE), an accumulation time of 2 min, a scan rate of 200 mV/s and a second-order derivative linear scan mode. The reduction peak for the complex appears at À 0.52 V. The peak current is proportional to the concentration of V(V) over the range of 0.10 -15.0 mg/L, and the detection limit is 0.04 mg/L for a 2 min adsorption time. The relative standard deviations(n ¼ 8) for 2.0 and 0.50 mg/L V(V) are 3.1 and 4.7%, respectively. The proposed method was applied to the determination of vanadium in water samples.

show abstract

“…However, some authors report that high sensitivity in CAdSV was achieved by means of modern Osteryoung SW voltammetry [71,73,80,91,112].…”

Section: Catalytic Adsorptive Stripping Voltammetrymentioning

confidence: 99%

Catalytic Systems in Adsorptive Stripping Voltammetry

2000

View full text Add to dashboard Cite

Catalytic stripping voltammetry of vanadium in the presence of dihydroxynaphthalene and bromate

Cited by 23 publications

References 18 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

Determination of Trace Vanadium by Adsorptive Stripping Voltammetry at a Carbon Paste Electrode

Catalytic Systems in Adsorptive Stripping Voltammetry

Contact Info

Product

Resources

About