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Anodic Stripping Voltammetric Determination of Lead in Tap Water at an Ordered Mesoporous Carbon/Nafion Composite film Electrode
Author(s) -
Zhu Liande,
Tian Chunyuan,
Yang Ruilan,
Zhai Jiangli
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200704088
Subject(s) - nafion , anodic stripping voltammetry , detection limit , tap water , stripping (fiber) , analytical chemistry (journal) , electrode , calibration curve , materials science , voltammetry , horizontal scan rate , anode , chemistry , cyclic voltammetry , electrochemistry , chromatography , composite material , environmental engineering , engineering
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.