title: Mercury Determination in Fish Samples by Chronopotentiometric Stripping Analysis Using Gold Electrodes Prepared from Recordable CDs.
abstract: A simple method for manufacturing gold working electrodes for chronopotentiometric stripping measurements from recordable CD-R's is described. These gold electrodes are much cheaper than commercially available ones. The electrochemical behavior of such an electrode and the working parameters for mercury determination by chronopotentiometric stripping analysis were studied. Detection limit was 0.30 μg Hg/L and determination limit was 1.0 μg Hg/L for a deposition time of 600 s. Using the developed working electrodes it was possible to determine the total mercury in fish samples. A method for fish sample digestion was developed by using a mixture of fuming nitric acid and both concentrated sulfuric and hydrochloric acids. The recovery degree for a known amount of mercury introduced in the sample before digestion was 95.3% (n=4).
authors.affiliation: University of Bucharest, Faculty of Chemistry, Sos. Panduri 90-92, 050657, Bucharest, Romania. cristinariz2002@yahoo.com.
authors.forename: Maria-Cristina
authors.initials: MC
authors.lastname: Radulescu
authors.affiliation: University of Bucharest, Faculty of Chemistry, Sos. Panduri 90-92, 050657, Bucharest, Romania. andreidanet@yahoo.com.
authors.forename: Andrei Florin
authors.initials: AF
authors.lastname: Danet
keywords: Mercury analysis; chronopotentiometric stripping analysis; fish analysis; fish digestion; gold electrodes