Anodic stripping voltammetry of tungsten at graphite electrodes | Zendy

Malakhova Natalia A. | Zendy; Popkova Gali. | Zendy; Wittmann Gertrud | Zendy; Kalnichevskaia Liubov N. | Zendy; Brainina Khjena Z. | Zendy

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Anodic stripping voltammetry of tungsten at graphite electrodes

Author(s) -

Malakhova Natalia A.,

Popkova Gali.,

Wittmann Gertrud,

Kalnichevskaia Liubov N.,

Brainina Khjena Z.

Publication year - 1996

Publication title -

electroanalysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.574

H-Index - 128

eISSN - 1521-4109

pISSN - 1040-0397

DOI - 10.1002/elan.1140080414

Subject(s) - stripping (fiber) , anodic stripping voltammetry , tungsten , graphite , supporting electrolyte , detection limit , electrode , electrolyte , chemistry , analytical chemistry (journal) , voltammetry , bismuth , nuclear chemistry , materials science , inorganic chemistry , electrochemistry , chromatography , composite material , organic chemistry

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 W v 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 H 2 SO 4 containing 0.078 M NH 4 SCN + 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 −9 M (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.

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