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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.