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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

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