Specificity of the ion exchange/atomic absorption method for free copper(II) species determination in natural waters
Journal Article
·
· Anal. Chem.; (United States)
Concentrations of the free copper(II) species (Cu/sup 2 +/) measured by the ion exchange/atomic absorption (IEX) method in the presence of various concentrations of the ligands citrate, glycinate, phthalate, salicylate, chloride, and fulvate are compared to concentrations measured with a cupric ion selective electrode (ISE) and/or to concentrations calculated from known metal-ligand formation constants. The IEX method is considerably more sensitive for Cu/sup 2 +/ than the ISE method but is subject to interference from cationic and neutral copper complexes as well as from filterable colloids copper-hydroxo species at higher pH values. Accurate values of Cu/sup 2 +/ concentration are obtained by both methods in the presence of anionic copper-ligand complexes. Since fulvate, which is the principal ligand present in natural freshwaters, forms anionic copper complexes, the IEX method possesses adequate selectivity for measuring Cu/sup 2 +/ at trace levels in such waters. The complexing capacity of an acidic lake water with a very low dissolved organic carbon content was measured as 3.0 x 10/sup -8/ M by monitoring Cu/sup 2 +/ concentration by the IEX method during titration with copper nitrate.
- Research Organization:
- Univ. of Alberta, Edmonton
- OSTI ID:
- 6814202
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:4; 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
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COPPER
DATA
ELEMENTS
EXPERIMENTAL DATA
FRESH WATER
HYDROGEN COMPOUNDS
INFORMATION
INTERFERING ELEMENTS
ION EXCHANGE CHROMATOGRAPHY
LIGANDS
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SPECTROSCOPY
TRACE AMOUNTS
TRANSITION ELEMENTS
WATER
400102* -- Chemical & Spectral Procedures
400105 -- Separation Procedures
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COPPER
DATA
ELEMENTS
EXPERIMENTAL DATA
FRESH WATER
HYDROGEN COMPOUNDS
INFORMATION
INTERFERING ELEMENTS
ION EXCHANGE CHROMATOGRAPHY
LIGANDS
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SPECTROSCOPY
TRACE AMOUNTS
TRANSITION ELEMENTS
WATER