A new sensitive and selective sensor for heavy metal ions based on tannin extracted from the skin of Punica granatum L. Issue 8 (20th June 2016)

• Record Type: Journal Article
• Authors: Bouraoui, Sarra; Zazoua, Ali; Braiek, Mohamed; Jaffrezic-Renault, Nicole
• Is Part Of: International journal of environmental analytical chemistry. Volume 96:Issue 8(2016)
• Page Start: 739
• Page End: 751
• Publication Date: 2016-06-20
• Subjects: Pomegranate -- sensors -- tannins -- heavy metals -- EIS -- SWV; Ecology -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental chemistry -- Periodicals; Pollution -- Periodicals; 577.14
• DOI: 10.1080/03067319.2016.1196682
• Languages: English
• ISSNs: 0306-7319

Abstract

ABSTRACT: This article presents the development of a sensor made from a gold electrode and a receiving polymeric membrane based on tannin extracted from the skin of Punica granatum. L (pomegranate) for real-time detection of heavy metals in a hydrous environment. The basic principle of this device is the complexing (chelating) of metal ions through the adjacent hydroxyl groups contained in the chemical structures of the tannins. The electrochemical characterisation was performed by using electrochemical impedance spectroscopy and square wave voltammetry. Other morphological and structural analyses were performed by using Fourier transform infrared spectroscopy and atomic-force microscopy. The results obtained showed the high sensitivity of the developed device (detection limits of 6.35 × 10 −9 g L −1 for Cu 2+, 1.1 × 10 −8 g L −1 for Cd 2+ and 2 × 10 −7 g L −1 for Pb 2+ ) and the possibility of simultaneously detecting several heavy metals, each one in a highly selective manner with highly acceptable response time (48s).