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Lead Determination on MWNT/Nafion Composite Modified Glassy Carbon Electrodes
Author(s) -
Xu Qin,
Liu NiNa,
Zhu JunJie
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200591510
Subject(s) - nafion , chemistry , electrode , nitric acid , composite number , glassy carbon , carbon nanotube , voltammetry , chemically modified electrode , cyclic voltammetry , calibration curve , differential pulse voltammetry , analytical chemistry (journal) , electrochemistry , inorganic chemistry , working electrode , chemical engineering , detection limit , composite material , chromatography , materials science , engineering
Abstract A composite material of nitric acid oxidized multiwalled carbon nanotube (MWNT) and Nafion was prepared. Such composite was modified on a glassy carbon electrode to determine trace of lead by differential pulsed voltammetry. In pH=6.47 NaNO 3 solution, Pb 2+ ions were accumulated on the modified electrode at −0.4 V. Compared with a bare and a Nafion film coated electrode, the composite coated GC electrode can reduce the accumulating potential and eliminate the toxic character of mercury. The calibration plots were linear at low concentration of 5.0×10 −9 –2.0×10 −8 mol/L and high concentration of 2.5×10 −8 –5.0×10 −6 mol/L. The performances characteristics indicate that the electrode can be used to determine trace Pb 2+ ions.