Anodic Stripping Voltammetric Determination of Lead in Tap Water at an Ordered Mesoporous Carbon/Nafion Composite film Electrode
✍ Scribed by Liande Zhu; Chunyuan Tian; Ruilan Yang; Jiangli Zhai
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 541 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
Abstract
A sensitive mercury‐free lead (Pb^2+^) sensor has been proposed based on an ordered mesoporous carbon and Nafion composite film (OMC/Nafion) coated glassy carbon electrode. The analysis of Pb^2+^ using anodic stripping voltammetry (ASV) includes two steps. Pb^2+^ ions are firstly reduced and deposited on the electrode surface in a Pb^2+^ solution (10 mL) during a preconcentration step biased at −1.0 V, followed by a measurement step by differential pulse voltammetry (DPV) within the potential range of −0.8 to −0.3 V (scan rate: 20 mV/s, frequency: 20 Hz, amplitude: 50 mV, pulse width: 50 ms). Linear calibration curve was found to be from 20 nM to 2 μM for Pb^2+^ with a sensitivity of 17.4±1.38 μA/μM after a 5‐min of preconcentration. The detection limit was estimated to be around 4.60±0.12 nM at the signal to noise ratio of 3. Reproducibility (RSD%) was found to be 3.0% for a single sensor with eight measurements and 4.3% for five sensors prepared with identical procedures. The practical application of the proposed lead sensor was verified by determination of trace level of Pb^2+^ in tap water sample.