Voltammetric determination of Cu(II) in natural waters and human hair at a meso-2,3-dimercaptosuccinic acid self-assembled gold electrode

Alireza Mohadesi; Mohammad Ali Taher

doi:10.1016/j.talanta.2006.09.031

Voltammetric determination of Cu(II) in natural waters and human hair at a meso-2,3-dimercaptosuccinic acid self-assembled gold electrode

Talanta. 2007 Apr 15;72(1):95-100. doi: 10.1016/j.talanta.2006.09.031. Epub 2006 Oct 30.

Authors

Alireza Mohadesi¹, Mohammad Ali Taher

Affiliation

¹ Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Kerman, Iran.

PMID: 19071587
DOI: 10.1016/j.talanta.2006.09.031

Abstract

An electrochemical sensor for the detection of copper(II) ions is described using a meso-2,3-dimercaptosuccinic acid (DMSA) self-assembled gold electrode. First in ammonia buffer pH 8, copper(II) ions complex with self-assembled monolayer (SAM) via the free carboxyl groups on immobilized meso-2,3-dimercaptosuccinic acid (accumulation step). Then, the medium is exchanged to acetate buffer pH 4.6 and the complexed Cu(II) ions are reduced in negative potential of -0.3V (reduction step). Following this, reduced coppers are oxidized and detected by differential pulse (DP) voltammetric scans from -0.3 to +0.7V (stripping step). The effective parameters in sensor response were examined. The detection limit of copper(II) was 1.29mugL(-1) and R.S.D. for 200mugL(-1) was 1.06%. The calibration curve was linear for 3-225mugL(-1) copper(II). The procedure was applied for determination of Cu(II) to natural waters and human hairs. The accuracy and precision of results were comparable to those obtained by flame atomic absorption spectroscopy (FAAS).