کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1171017 | 960700 | 2007 | 11 صفحه PDF | دانلود رایگان |

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 (1.0 × 10−7 to 1.0 × 10−2 M). The electrode exhibited a detection limit of 8.0 × 10−8 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 ∼50 s, 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.
Journal: Analytica Chimica Acta - Volume 601, Issue 2, 10 October 2007, Pages 172–182