ENVR 186 |
| We describe an ultrasensitive voltammetric detection of trace heavy metal ions using chelate-functionalized carbon nanotube-modified electrodes. Suspensions of multi-walled carbon nanotubes (MWNTs) were covalently bound with various metal-specific chelate in separate reactions. The suspensions of the chelate-functionalized MWNTs were then mixed in different ratios and cast on glassy carbon electrodes. The resulting multichelate-functionalized carbon nanotube glassy carbon electrodes were suspended in a solution containing multiple heavy metals resulted in accumulation of various metals via complexation reactions. Preliminary stripping voltammetric analysis results indicate extremely sensitive and simultaneous detection of multiple heavy metals. The procedure was optimized with respect to the ratios and amount MWNT cast, applied reduction potentials, pH and concentration of the buffer solution used for accumulation and voltammetric detection. |
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Sensors for Detection and Quantification of Contaminants in Drinking Water and the Environment
1:30 PM-5:10 PM, Wednesday, April 9, 2008 Morial Convention Center -- Rm. 235, Oral
Division of Environmental Chemistry |