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

Journal Article · Thu Nov 01 00:00:00 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), Vol. 56:13
• Country of Publication: United States
• Language: English

Related Subjects

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