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Microelectrodes for the determination of heavy metal traces in physiological conditions: Hg, Cu and Zn ions in synthetic saliva

Sanna, Gavino and Pilo, Maria Itria and Piu, Paola Costantina and Spano, Nadia and Tapparo, Andrea and Seeber, Renato (2002) Microelectrodes for the determination of heavy metal traces in physiological conditions: Hg, Cu and Zn ions in synthetic saliva. Electroanalysis, Vol. 14 (21), p. 1512-1520. ISSN 1521-4109. Article.

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DOI: 10.1002/1521-4109(200211)14:21<1512::AID-ELAN1512>3.0.CO;2-3

Abstract

The present article reports an introductory study aimed to define voltammetric methodologies employing microelectrodes for the quantitative evaluation of Hg and other heavy metals in physiological-like matrices as synthetic saliva. The utilization of graphite, Pt and Au microdisc electrodes as voltammetric sensors in the differential-pulse stripping analysis of Hg, Cu, Ag, Sn and Zn (the main constituents of the well-known dental or silver amalgams, largely used for the dental restoration) has been studied in different artificial saliva. The best analytical performances, in terms of detection limit, repeatability and width of the potential window available, have been shown by graphite electrodes. Co-deposition effects (e.g., Pb or Cd) play an important role in improving detection limit and repeatability of the responses of graphite electrodes in the determination of Hg. The conditions for contemporary determination of Hg, Cu and Zn in a single re-oxidation step are also established and selected experimental conditions are proposed by virtue of the absence of Cu-Zn intermetallic interference in the deposition step. On the other hand, the study has shown that no possible combination of experimental conditions, i.e., nature of electrode and saliva, presence or absence of other reducible ions, allows the detection of Ag and Sn at µg dm-3 levels.

Item Type:Article
ID Code:3681
Status:Published
Refereed:Yes
Uncontrolled Keywords:Microelectrodes, differential-pulse stripping analysis, heavy metals determination, mercury determination, synthetic saliva
Subjects:Area 03 - Scienze chimiche > CHIM/01 Chimica analitica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Wiley
ISSN:1521-4109
Deposited On:02 Apr 2010 19:20

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