Specificity of the ion exchange/atomic absorption method for free copper(II) species determination in natural waters
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), Vol. 59:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
COPPER
ABSORPTION SPECTROSCOPY
ION EXCHANGE CHROMATOGRAPHY
FRESH WATER
QUANTITATIVE CHEMICAL ANALYSIS
EXPERIMENTAL DATA
INTERFERING ELEMENTS
LIGANDS
PH VALUE
TRACE AMOUNTS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
ELEMENTS
HYDROGEN COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SPECTROSCOPY
TRANSITION ELEMENTS
WATER
400102* - Chemical & Spectral Procedures
400105 - Separation Procedures
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)