Anodic stripping voltammetry of tungsten at graphite electrodes

Anodic stripping voltammetry of tungsten at graphite electrodes

Trace levels of tungsten can be determined at a graphite electrode using anodic stripping voltammetry. Tungsten is concentrated at the electrode surface after reduction to Wv as a insoluble ternary complex in the presence of rhodanide ions and antipyrine (ANT) or 4‐ dimethyl‐aminoantipyrine (pyramid...

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Veröffentlicht in:Electroanalysis (New York, N.Y.) N.Y.), 1996-04, Vol.8 (4), p.375-380
Hauptverfasser: Malakhova, Natalia A., Popkova, Galina N., Wittmann, Gertrud, Kalnichevskaia, Liubov N., Brainina, Khjena Z.
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Sprache:eng
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Stripping voltammetry
Tungsten
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container_issue 4
container_start_page 375
container_title Electroanalysis (New York, N.Y.)
container_volume 8
creator Malakhova, Natalia A.
Popkova, Galina N.
Wittmann, Gertrud
Kalnichevskaia, Liubov N.
Brainina, Khjena Z.
description Trace levels of tungsten can be determined at a graphite electrode using anodic stripping voltammetry. Tungsten is concentrated at the electrode surface after reduction to Wv as a insoluble ternary complex in the presence of rhodanide ions and antipyrine (ANT) or 4‐ dimethyl‐aminoantipyrine (pyramidon, PYR). The optimal conditions of this determination are: electrolyte 1 M H2SO4 containing 0.078 M NH4SCN + 0.04M ANT or 0.02M PYR; deposition potential −0.50 V; sweep from −0.4 to −0.05 V using differential pulse stripping technique. Detection limit is 1 × 10−9M (0.2 μg/L) for a 180 s accumulation time (with a relative standard deviation of 15%). Results obtained for waste waters, steel and olive leaves are reported.
doi_str_mv 10.1002/elan.1140080414
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subjects Stripping voltammetry
Tungsten
title Anodic stripping voltammetry of tungsten at graphite electrodes
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