Anodic Stripping Voltammetric Determination of Lead in Tap Water at an Ordered Mesoporous Carbon/Nafion Composite film Electrode

A sensitive mercury-free lead (Pb2+) sensor has been proposed based on an ordered mesoporous carbon and Nafion composite film (OMC/Nafion) coated glassy carbon electrode. The analysis of Pb2+ using anodic stripping voltammetry (ASV) includes two steps. Pb2+ ions are firstly reduced and deposited on the electrode surface in a Pb2+ 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 Pb2+ 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 Pb2+ in tap water sample.

[1]  M. Jaroniec,et al.  Ordered mesoporous carbons , 2001 .

[2]  S. Joo,et al.  Nanostructured Carbon Materials Synthesized from Mesoporous Silica Crystals by Replication , 2004 .

[3]  Lu,et al.  Bismuth-coated carbon electrodes for anodic stripping voltammetry , 2000, Analytical chemistry.

[4]  C. Brett,et al.  Anodic stripping voltammetry of trace metals by batch injection analysis , 1996 .

[5]  M. Hartmann,et al.  Adsorption of vitamin E on mesoporous silica molecular sieves , 2005 .

[6]  K. Ariga,et al.  Biomaterial immobilization in nanoporous carbon molecular sieves: influence of solution pH, pore volume, and pore diameter. , 2005, The journal of physical chemistry. B.

[7]  G. Batley.  In situ electrodeposition for the determination of lead and cadmium in sea water , 1981 .

[8]  Hongyuan Chen,et al.  Direct electron transfer and electrocatalysis of hemoglobin adsorbed on mesoporous carbon through layer-by-layer assembly. , 2007, Biosensors & bioelectronics.

[9]  Mietek Jaroniec,et al.  Synthesis of New, Nanoporous Carbon with Hexagonally Ordered Mesostructure , 2000 .

[10]  A. Manivannan,et al.  Detection of trace levels of Pb2+ in tap water at boron-doped diamond electrodes with anodic stripping voltammetry , 2006 .

[11]  Kangbing Wu,et al.  Voltammetric determination of Cd2+ based on the bifunctionality of single-walled carbon nanotubes-Nafion film. , 2007, Analytica chimica acta.

[12]  Kangbing Wu,et al.  Square wave anodic stripping voltammetric determination of Pb2+ using acetylene black paste electrode based on the inducing adsorption ability of I-. , 2006, Analytica chimica acta.

[13]  Haoshen Zhou,et al.  Electrochemical capacitance of self-ordered mesoporous carbon , 2003 .

[14]  C. Cremisini,et al.  Determination of heavy metals in wines by anodic stripping voltammetry with thick-film modified electrode , 2004 .

[15]  Shengshui Hu,et al.  Mercury-free simultaneous determination of cadmium and lead at a glassy carbon electrode modified with multi-wall carbon nanotubes , 2003 .

[16]  H. F. Kraybill,et al.  Toxic effects of cadmium: a review. , 1971, Environmental research.

[17]  S. Daniele,et al.  Stripping analysis at mercury microelectrodes in the absence of supporting electrolyte , 1993 .

[18]  G. Swain,et al.  Metal ion analysis in contaminated water samples using anodic stripping voltammetry and a nanocrystalline diamond thin-film electrode , 2004 .

[19]  F. Anson,et al.  Some aspects of anion-induced adsorption of white metal cations on mercury , 1970 .

[20]  Juhyoun Kwak,et al.  Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles , 2001, Nature.

[21]  Sang Hoon Joo,et al.  Synthesis of highly ordered carbon molecular sieves via template-mediated structural transformation , 1999 .

[22]  B. Rezaei,et al.  High selective SiO2-Al2O3 mixed-oxide modified carbon paste electrode for anodic stripping voltammetric determination of Pb(II). , 2007, Talanta.

[23]  Yuehe Lin,et al.  Screen-printed electrodes modified with functionalized mesoporous silica for voltammetric analysis of toxic metal ions , 2005 .

[24]  A. Rebello,et al.  Studies on the anodic stripping voltammetry of lead in polluted estuarine waters , 1983 .

[25]  Joseph Wang,et al.  Batch injection stripping voltammetry of trace metals , 1992 .

[26]  T. Hyeon,et al.  Synthesis of new nanoporous carbon materials using nanostructured silica materials as templates , 2004 .

[27]  F. Anson,et al.  Anion induced adsorption of cadmium(II) on mercury from iodide and bromide media , 1968 .