Determination of Pb2+ ions by a modified carbon paste electrode based on multi-walled carbon nanotubes (MWCNTs) and nanosilica

A novel carbon paste ion selective electrode for determination of trace amount of lead was prepared. Multi-walled carbon nanotubes (MWCNTs) and nanosilica were used for improvement of a lead carbon paste sensor response. MWCNTs have a good conductivity which helps the transduction of the signal in c...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-01, Vol.173 (1-3), p.415-419
Main Authors: MOHAMMAD REZA GANJALI, MOTAKEF-KAZAMI, Negar, FARIDBOD, Farnoush, KHOEE, Sepideh, NOROUZI, Parviz
Format: Article
Language:English
Subjects:
Applied sciences
Calibration
Carbon
Carbon - analysis
Concentration (composition)
Electrodes
Exact sciences and technology
General purification processes
Graphite
Lead - analysis
Membranes, Artificial
Multi wall carbon nanotubes
Nanocomposites
Nanomaterials
Nanostructure
Nanotubes - analysis
Pastes
Pollution
Sewage - analysis
Silicon Dioxide - analysis
Tea - chemistry
Thiram - chemistry
Waste Disposal, Fluid
Wastewaters
Water treatment and pollution
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Summary:A novel carbon paste ion selective electrode for determination of trace amount of lead was prepared. Multi-walled carbon nanotubes (MWCNTs) and nanosilica were used for improvement of a lead carbon paste sensor response. MWCNTs have a good conductivity which helps the transduction of the signal in carbon paste electrode. The electrode composition of 20 wt% paraffin oil, 57% graphite powder, 15% ionophore (thiram), 5% MWCNTs, and 3% nanosilica showed the stable potential response to Pb(2+) ions with the Nernstian slope of 29.8 (+/-0.2)mV decade(-1) over a wide linear concentration range of 10(-7)-10(-2)mol L(-1). The electrode has fast response time, and long term stability (more than 2 months). The proposed electrode was used to determine the concentration of lead ions in waste water and black tea samples.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2009.08.101