Adsorptive cathodic stripping voltammetric determination of ultra-trace concentrations of vanadium on a glassy carbon mercury film electrode

Determination of trace vanadium(V) by adsorptive anodic stripping voltammetry on an acetylene black paste electrode in the presence of alizarin violet

“…Specifically, adsorptive stripping voltammetry (AdSV) and catalytic adsorptive stripping voltammetry (CAdSV), based on the interfacial accumulation and voltammetric determination of metal complexes, has been shown useful for determining vanadium in various matrices [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]26]. Different complexing agents, such as 2,3-dihydroxynaphthalene [10], cupferron [11,12], chloranilic acid [13][14][15], catechol [16], 2-(5 0 -bromo-2 0 -pyridylazo)-5-diethylaminophenol [17,18], pyrogallol [19], 2-(2 0 -thiazolylaloz)-p-cresol [20], pyrocatechol violet [21] and solochrome violet RS [22] have been proposed. However, a limitation of these AdSV and CAdSV protocols, is their requirement for mercury electrodes.…”

Catalytic-adsorptive determination of vanadium in solutions of 2,3-dihydroxybenzaldehide and bromate-ions

“…The addition to a solution of vanadium (V) of hydroxyl-containing ligands, such as trihydroxyglutaric acid [4], catechol [5,6], catechol violet [7], pyrogallol [8], 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone [1,9,10], dihydroxynaphtalene [2] and other hydroxyl-containing aromatic compounds [11][12][13][14] leads to formation of complexes that are adsorbed on the mercury electrode surface and are reduced significantly easier, than vanadium itself. This allows using them in the adsorptive cathodic voltammetry (AdCV).…”

“…So, the solutions of catechol and pyrogallol [5][6][7][8] are prepared daily because of their easy oxidability by oxygen from air. A very sensitive peak of vanadium in solutions of mandelic acid and bromate [2] is impeded by molybdenum, giving in the same solutions a peak with a potential close to the peak potential of vanadium and as resultboth peaks are overlapped.…”

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

“…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].…”