Open AccessVoltammetric studies on mercury behavior in different aqueous solutions for further development of a warning system designed for environmental monitoring
Author(s) -
Paul-Cristinel Verestiuc,
Igor Creţescu,
Oana-Maria Tucaliuc,
Iuliana Gabriela Breabăn,
Gheorghe Nemţoi
Publication year - 2014
Publication title -
journal of electrochemical science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.236
H-Index - 6
ISSN - 1847-9286
DOI - 10.5599/jese.2014.0068
Subject(s) - mercury (programming language) , aqueous solution , electrode , analytical chemistry (journal) , electrolyte , chemistry , calibration curve , dropping mercury electrode , horizontal scan rate , supporting electrolyte , electrochemistry , working electrode , tap water , materials science , detection limit , chromatography , environmental engineering , computer science , programming language , engineering , cyclic voltammetry
This article presents some results concerning the electrochemical detection of mercury in different aqueous solutions, using the following electrodes: platinum-disk electrode (PDE), carbon paste electrode (CPE) and glass carbon electrode (GCE). Using the voltammetric technique applied on the above mentioned electrodes, the experimental conditions were established in order to obtain the maximum current peaks, in terms of the best analytical characteristics for mercury analyses. The dependence equations of cathodic current intensity on the scan rate were established in the case of mercury ion discharge in each prepared solution of 0.984 mM HgCl2 in different electrolyte background: 0.1 M KCl, 0.1 M H2SO4 and 0.9 % NaCl. Among the three investigated electrodes, the carbon paste electrode presented the highest detection sensitivity toward mercury ions in the aqueous solution. It was observed that, at a low scanning rate, the pH had an insignificant influence over the current peak intensity; however, the quantification of this influence was achieved using a quadratic polynomial equation, which could prevent the errors in mercury detection in case of industrial waste stream pH changes. The calibration curves for mercury in 0.9 % NaCl solution and in the tap water respectively were carried out.