Direct electrochemical determination of dissolved vanadium in seawater by cathodic stripping voltammetry with the hanging mercury drop electrode

Journal Article · Thu Nov 01 04:00:00 EST 1984 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00277a028· OSTI ID:5717147

van den Berg, C M.G.; Huang, Z Q

Polarographic measurements showed that catechol complexes of vanadium(V) adsorb onto the hanging mercury drop electrode. This property forms the basis of a sensitive electrochemical technique by which dissolved vanadium in seawater can be determined directly. The reduction current of adsorbed complex ions of vanadium is measured by differential pulse cathodic stripping voltammetry, preceded by a period of collection of a few minutes. The peak potential is at approx.-0.7 V. Optimal experimental parameters were found to be a catechol concentration of 2 X 10/sup -4/ M, a collection potential of -0.1 V, and a solution pH of 6.9. The limit of detection is 0.3 nM vanadium after a 2-min collection with a stirred solution, which is described further to 0.1 nM after a 15-min collection.

• Research Organization: Univ. of Liverpool, England
• OSTI ID: 5717147
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 56:13; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AROMATICS
CHEMICAL ANALYSIS
DATA
DEVELOPERS
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHENOLS
POLAROGRAPHY
POLYPHENOLS
PYROCATECHOL
QUANTITATIVE CHEMICAL ANALYSIS
SEAWATER
TRACE AMOUNTS
TRANSITION ELEMENTS
VANADIUM
VOLTAMETRY
WATER