Direct determination of molybdenum in seawater by adsorption voltametry
Journal Article
·
· Anal. Chem.; (United States)
Complex ions of molybdenum(VI) with 8-hydroxyquinoline (oxine) are shown to adsorb onto the hanging mercury drop electrode. This property forms the basis of a sensitive electrochemical technique by which dissolved molybdenum in seawater can be determined directly. The reduction current of adsorbed complex ions is measured by differential pulse adsorption voltametry, preceded by a period of 1 or 2 min of unstirred collection at an adsorption potential of -0.2 V. In the presence of 2 x 10/sup -3/ M oxine and at pH 2.5 the potential of the main reduction peak is located at -0.59 V. The peak current-molybdenum concentration relationship is linear up to 3 x 10/sup -7/ M; the detection limit is 4 nM. Greater sensitivity is obtained after stirred collection at pH 3.0 and with 10/sup -4/ M oxine, but the calibration curve is nonlinear. In these conditions the limit of detection lies at 10/sup -10/ M after 10 min stirred collection. 19 references, 8 figures.
- Research Organization:
- Univ. of Liverpool, England
- OSTI ID:
- 5425137
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 57:8; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400105 -- Separation Procedures
400400 -- Electrochemistry
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AROMATICS
AZAARENES
AZINES
CHEMICAL ANALYSIS
CHEMISTRY
CURRENTS
DATA
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
MERCURY
METALS
MOLYBDENUM
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXINE
OXYGEN COMPOUNDS
PH VALUE
PREDICTION EQUATIONS
PULSE TECHNIQUES
PYRIDINES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
QUINOLINES
SEAWATER
SORPTION
TRANSITION ELEMENTS
VOLTAMETRY
WATER
400102* -- Chemical & Spectral Procedures
400105 -- Separation Procedures
400400 -- Electrochemistry
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AROMATICS
AZAARENES
AZINES
CHEMICAL ANALYSIS
CHEMISTRY
CURRENTS
DATA
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
EQUATIONS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
MERCURY
METALS
MOLYBDENUM
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXINE
OXYGEN COMPOUNDS
PH VALUE
PREDICTION EQUATIONS
PULSE TECHNIQUES
PYRIDINES
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
QUINOLINES
SEAWATER
SORPTION
TRANSITION ELEMENTS
VOLTAMETRY
WATER