Use of organofunctionalized nanoporous silica gel to improve the lifetime of carbon paste electrode for determination of copper(II) ions.
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.
Javanbakht
Mehran
M
Department of Chemistry, Amirkabir University of Technology, Tehran, Iran. javanbakht@cic.aut.ac.ir
Badiei
Alireza
A
Ganjali
Mohammad Reza
MR
Norouzi
Parviz
P
Hasheminasab
Abed
A
Abdouss
Majid
M
D002244:Carbon; D003300:Copper / Q000032:analysis*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D036103:Nanotechnology; D012822:Silicon Dioxide
D002244:Carbon; D012822:Silicon Dioxide; D003300:Copper