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Anodic stripping voltammetric determination of vanadium( V ) using a carbon paste electrode modified in situ with cetyltrimethylammonium bromide
Author(s) -
Stadlober Monika,
Kalcher Kurt,
Raber Georg
Publication year - 1997
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.1140090307
Subject(s) - bromide , vanadium , stripping (fiber) , in situ , electrode , anode , anodic stripping voltammetry , chemistry , inorganic chemistry , materials science , electrochemistry , organic chemistry , composite material
A method for the voltammetric determination of vanadium(v) using a carbon paste electrode in situ modified with cetyltrimethylammonium bromide (CTAB) is described. Vanadium is preconcentrated at the electrode surface via its anionic oxalate complex from acidic solution (0.01 M oxalic acid, 0.25 mM CTAB, pH 2.2) at a potential of −0.9 V [vs. the saturated calomel electrode (SCE)]. Simultaneously during accumulation, vanadium(v) in the complex is reduced to its tetravalent state. Differential pulse anodic stripping voltammetry exploiting the reoxidation can be used for the determination of trace levels of vanadium(v). Linearity between current and concentration exists for a range of 5 to 200 μg.L −1 V v with a preconcentration time of 1 min. The limit of detection (calculated as 3 σ) is 0.07 μg.L −1 with a preconcentration time of 10 min.