ISSN:
1040-0397
Keywords:
Modified electrodes
;
Trace metal analysis
;
Stripping analysis
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The strong chelating ability of mercaptoacetic acid for certain metal ions is exploited for a new kind of voltammetric sensor. Specifically, a glassy carbon electrode (GCE) surface was covalently covered by mercaptoacetic acid. The preparation of mercaptoacetic acid-modified glassy carbon electrode (MMGCE) under various conditions is explored. The electrodes so formed were able to chemically collect metal ions such as mercuric ions and yielded a 10-fold greater voltammetric response than a bare glassy carbon surface. The response was characterized with respect to pH, preconcentration time, mercury(II) concentration, and other variables. For 3 minute preconcentration, the electrode gives good linearity for 1 × 10-8 mol/L to 1 × 10-9 mol/L mercuiy(II). The response can be reproduced with a 7.7% relative standard deviation. A range of analytical methods, including electrochemical, electron spectroscopy for chemical analvsis (ESCA) techniques, and alternating current (AC) polarography has been used to characterize these novel modified dectrpdes. The reaction of MMGCE to mercury ion is produced by weak adsorption.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140061016
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