期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 173, 期 1-3, 页码 415-419出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.08.101
关键词
Multi-walled carbon nanotubes; Nanosilica; Sensor; Lead ions; Carbon paste ion selective
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. (C) 2009 Elsevier B.V. All rights reserved.
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