Determination of humic substances in seawater by electrochemistry (mechanisms)
Journal Article
·
· Anal. Lett.; (United States)
A new method for the measurement of the concentration of humic substances (HS) in seawater is described. The peak obtained by differential cathodic sweep voltammetry after HS adsorption in the presence of traces of molybdenum(VI) can be used for quantitative determination. Measurements using various electrochemical techniques, alternating current polarography, cyclic voltammetry, and adsorptive differential pulse voltammetry, would indicate that the film adsorbed onto the electrode is the result of the adsorption of the organic substance in a first step followed in a subsequent step by the formation of a surface complex (Mo(VI)-HS)/sub ads/ rather than the direct adsorption of the dissolved complex. The electrochemical mechanism corresponds to a one-electron reduction of the adsorbed (Mo(VI)-HS)/sub ads/complex to the corresponding (Mo(V)-HS)/sub ads/ complex. 15 references, 6 figures.
- Research Organization:
- Universite de Bretagne Occidentale, Brest, France
- OSTI ID:
- 6411798
- Journal Information:
- Anal. Lett.; (United States), Journal Name: Anal. Lett.; (United States) Vol. 20:1; ISSN ANALB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
CHEMICAL ANALYSIS
DATA
EXPERIMENTAL DATA
HUMIC ACIDS
HYDROGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLAROGRAPHY
QUANTITATIVE CHEMICAL ANALYSIS
SEAWATER
SORPTION
VOLTAMETRY
WATER
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
CHEMICAL ANALYSIS
DATA
EXPERIMENTAL DATA
HUMIC ACIDS
HYDROGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLAROGRAPHY
QUANTITATIVE CHEMICAL ANALYSIS
SEAWATER
SORPTION
VOLTAMETRY
WATER