The electrochemical reduction of trinitrotoluene on a platinum wire modified by chemisorbed acetonitrile
Abstract
The electrochemical reduction of 2,4,6-trinitrotoluene (TNT) was investigated by cyclic voltammetry on a platinum electrode in aqueous sodium chloride solutions with acetonitrile containing different concentrations of TNT. The obtained cyclic voltammograms showed three distinct reduction peaks in the potential range of -0.45 to -0.8 V (vs. an Ag/AgCl (3M KCl) reference electrode), which refer to the multi-step process of TNT reduction. The calibration curves of the dependence of the first peak current on the TNT concentration were linear in the ranges 4.4-638.4 mu M and 0.11-4.40 mu M for two different scan rates, 200 my s(-1) and 20 mV s(-1), respectively. The detection limit was 0.11 mu M. Acetonitrile chemisorption on Pt surface took place and caused thus modified platinum electrode to exhibit an electrochemically stabile behaviour. Hence, a very high reproducibility over a prolonged time and voltammetric cycling was provided for using a Pt wire that is easy to handle as a suitable ...material for TNT sensing. Additionally, it was confirmed by testing the acetonitrile modified Pt wire for TNT detection in river water.
Keywords:
Trinitrotoluene / Electrochemical reduction / Platinum / AcetonitrileSource:
Journal of Electroanalytical Chemistry, 2010, 648, 1, 1-7Publisher:
- Elsevier
Projects:
- Modifikacija metalnih i nemetalnih materijala elektroprovodnim polimerima za primenu u novim tehnologijama (RS-142044)
- Mezoporozni i nanomaterijali u katalitičkim i sorpcionim procesima (RS-166001)
DOI: 10.1016/j.jelechem.2010.07.008
ISSN: 1572-6657