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- Title
Stripping chronopotentiometric measurements of lead(II) and cadmium(II) in soils extracts and wastewaters using a bismuth film screen-printed electrode assembly.
- Authors
Kadara, Rashid O.; Tothill, Ibtisam E.
- Abstract
The key to remediative processes is the ability to measure toxic contaminants on-site using simple and cheap sensing devices, which are field-portable and can facilitate more rapid decision-making. A three-electrode configuration system has been fabricated using low-cost screen-printing (thick-film) technology and this coupled with a portable electrochemical instrument has provided a a relatively inexpensive on-site detector for trace levels of toxic metals. The carbon surface of the screen-printed working electrode is used as a substrate for in situ deposition of a metallic film of bismuth, which allows the electrochemical preconcentration of metal ions. Lead and cadmium were simultaneously detected using stripping chronopotentiometry at the bismuth film electrode. Detection limits of 8 and 10 ppb were obtained for cadmium(II) and lead(II), respectively, for a deposition time of 120 s. The developed method was applied to the determination of lead and cadmium in soils extracts and wastewaters obtained from polluted sites. For comparison purposes, a mercury film electrode and ICP-MS were also used for validation.
- Subjects
STRIPPERS (Chemical technology); SOIL pollution; TOXICOLOGICAL chemistry; CADMIUM; LEAD; SEWAGE; SEPARATION (Technology)
- Publication
Analytical & Bioanalytical Chemistry, 2004, Vol 378, Issue 3, p770
- ISSN
1618-2642
- Publication type
Article
- DOI
10.1007/s00216-003-2351-x