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Journal of Chemistry
Volume 2013 (2013), Article ID 414375, 7 pages
http://dx.doi.org/10.1155/2013/414375
Research Article

Modification of Multiwalled Carbon Nanotubes by Dipyridile Amine for Potentiometric Determination of Lead(II) Ions in Environmental Samples

Department of Chemistry, Shahr-e-Rey Branch, Islamic Azad University, P.O. Box 18735-334, Tehran, Iran

Received 9 June 2012; Accepted 21 November 2012

Academic Editor: Patricia Valentao

Copyright © 2013 Hamid Reza Lotfi Zadeh Zhad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A carbon paste electrode was modified by dipyridile amine functionalized multiwalled carbon nanotubes for determination of trace amounts of lead(II) ions. The electrode composition was graphite powder 70%, paraffin 23%, and dipyridile amine modified MWCNTs 7% (W/W). The linear range for lead(II) was 9.5 × 10−8 to 2.5 × 10−3 mol L−1, and the limit of detection was obtained 7.0 × 10−8 mol L−1. The lifetime of the electrode was ten weeks, and a fast response time was observed. The electrode was used for determination of trace amounts of Pb(II) ions in real samples and standard reference materials of water, soil, and plant.