Metal speciation by Donnan dialysis
In Donnan dialysis aqueous samples are separated from receiver electrolytes by an ion exchange membrane. The present work demonstrates that the dialysis of metals into salt solutions occurs in proportion to the sum of the concentrations of the free metal and the metal held in the form of labile complexes; however, with strongly acidic or chelating receivers, the dialysis occurs in proportion to the total soluble metal. Hence, Donnan dialysis provides the basis for a rapid estimation of the total soluble (i.e., free plus labile complexed) metal and nonlabile-complexed metal. The method is demonstrated with Pb, Zn, Cu, and Cd complexes of glycine, humic acid, and nitrilotriacetic acid and is applied to a lake water sample. The results are compared to values obtained from an established approach that utilizes stripping voltammetry and separations with a chelating ion exchange resin.
- Research Organization:
- Southern Illinois Univ., Carbondale
- OSTI ID:
- 6054699
- Journal Information:
- Anal. Chem.; (United States), Vol. 56:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CADMIUM
DIALYSIS
ION EXCHANGE
COPPER
LEAD
ZINC
AQUEOUS SOLUTIONS
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
ION EXCHANGE MATERIALS
LAKES
MEMBRANES
WATER
WATER QUALITY
DATA
DISPERSIONS
ELEMENTS
ENVIRONMENTAL QUALITY
HYDROGEN COMPOUNDS
INFORMATION
MATERIALS
METALS
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SOLUTIONS
SURFACE WATERS
TRANSITION ELEMENTS
400102* - Chemical & Spectral Procedures
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)