Abstract
A multi‐wall carbon nanotubes (MWCNTs) and Nafion composite film‐modified glassy carbon electrode (GCE) is described for the detection of europium (III) by differential pulse adsorptive stripping voltammetry. In pH 4.2 NaAc–HAc buffer solution, Eu3+ is first exchanged by Nafion and absorbed on the surface of MWCNTs film. The accumulated Eu3+ then undergoes a one‐electron reduction around −0.7 V during the potential sweep from −0.1 to −1.0 V. The MWCNTs–Nafion film significantly improves the sensitivity of Eu3+ determination compared with a bare GCE and a Nafion‐coated GCE. The differential pulse stripping voltammetric (DPSV) signal changes linearly with the concentration of Eu3+ in a wide range from 4.0×10−8 to 1.0×10−4 M. The detection limit is estimated to be 10 nM for 60 s accumulation at −0.1 V. Lots of inorganic ions and all of the other rare earth ions do not give characteristic voltammetric responses in the developed operation. The sensitivity and stability of this MWCNTs–Nafion GCE has demonstrated its application for a rapid and mercury‐free detection of trace Eu3+ in NIES CRM No. 8 vehicle exhaust particulates.
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