Modification of multiwalled carbon nanotubes by dipyridile amine for potentiometric determination of lead(II) ions in environmental samples

چکیده مقاله

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. © 2013 Hamid Reza Lotfi Zadeh Zhad et al.