1. Use of organofunctionalized nanoporous silica gel to improve the lifetime of carbon paste electrode for determination of copper(II) ions
- Author
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Alireza Badiei, Mohammad Reza Ganjali, Parviz Norouzi, Majid Abdouss, Abed Hasheminasab, and Mehran Javanbakht
- Subjects
Detection limit ,Chemistry ,Nanoporous ,Silicon dioxide ,Silica gel ,Potentiometric titration ,Analytical chemistry ,chemistry.chemical_element ,Hydrogen-Ion Concentration ,Silicon Dioxide ,Biochemistry ,Copper ,Carbon ,Analytical Chemistry ,Carbon paste electrode ,chemistry.chemical_compound ,Electrode ,Nanotechnology ,Environmental Chemistry ,Electrodes ,Spectroscopy ,Nuclear chemistry - Abstract
A new functionalized nanoporous silica gel with dipyridyl group (DPNSG) was synthesized. Then, the potentiometric response of the copper(II) ion was investigated at a carbon paste electrode chemically modified with this newly designed functionalized nanoporous silica gel. The electrodes with DPNSG proportions of 15.0% (w/w) demonstrated very stable potentials. Calibration plots with Nernstian slopes for Cu2+ were observed, 28.4 (+/-1.0) mV decade(-1), over a wide linear concentration range (1.0x10(-7) to 1.0x10(-2) M). The electrode exhibited a detection limit of 8.0x10(-8) M. Moreover, the selectivity coefficients measured by the match potential method in acetate buffer, pH 5.5, were investigated. The electrode presented a response time of approximately 50s, high performance, high sensitivity in a wide range of cation activities and good long-term stability (more than 9 months). The method was satisfactory and was used to determine the copper ion concentration in waste waters, contaminated by this metal.
- Published
- 2007
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