Cellulose acetate coated mercury film electrodes for anodic stripping voltametry
The response characteristics and analytical advantages of cellulose acetate coated mercury film electrodes for anodic stripping measurements of trace metals are described. The coating provides an effective barrier of the mercury surface, thus eliminating the effects of various organic surfactants. For example, up to at least 100 ppm gelatin does not alter the response. The diagnostic power of rotating disk measurements is used to evaluate the transport toward the mercury surface. The response is limited by the permeability of the film, thus allowing stripping measurements in systems with poorly controlled mass transport. Base hydrolysis of the film is used to manipulate the permeability. Scanning electron micrographs show the microstructures of the films following different hydrolysis times. The discriminative properties of these coatings can be used also to improve the resolution between two adjacent stripping peaks. The response of the modified electrode is directly proportional to the analyte concentration and is reproducible. With a 10-min deposition time, detection limits are 7 x 10 M lead and 1.3 x 10 Z M cadmium. Various metal ions and organic surfactants are tested. The performance of this novel electrode system is compared to that of a conventional mercury film electrode. 19 references, 9 figures, 2 tables.
- Research Organization:
- New Mexico State Univ., Las Cruces
- OSTI ID:
- 6271197
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 58:2; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102* -- Chemical & Spectral Procedures
ACETATES
CADMIUM
CARBOHYDRATES
CARBOXYLIC ACID SALTS
CELLULOSE
CHEMICAL ANALYSIS
COATINGS
COPPER
DATA
ELECTRODES
ELEMENTS
EXPERIMENTAL DATA
FILMS
INFORMATION
LEAD
MASS TRANSFER
MERCURY
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PERFORMANCE
PERMEABILITY
POLYSACCHARIDES
QUANTITATIVE CHEMICAL ANALYSIS
SACCHARIDES
TRACE AMOUNTS
TRANSITION ELEMENTS
VOLTAMETRY