Article ID Journal Published Year Pages File Type
580983 Journal of Hazardous Materials 2010 5 Pages PDF
Abstract
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 Pb2+ 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.
Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Health and Safety
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