Tetraoctylammonium Ion을 Ionophore로 이용한 Nitrate 이온 선택성 전극
Nitrate Ion Selective Electrode Based on Tetraoctylammonium Ionophore
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In this paper, the potentiometric sensors with the new neutral carriers were introduced. These electrodes were poly aniline solid contact electrodes with PVC matrix. The poly aniline layer was prepared by aniline electropolymerization on platinum substrate from Hydrochloric acid solution. The PVC layer was built with the PVC, the plasticizer and the neutral carriers, that were tetraoctylammonium bromide and tetraoctylammonium nitrate. The electrodes based on these neutral carriers that selective respond in soln. sample to nitrate ion. The electrode using tetraoctylammonim bromide as the neutral carrier showed the best response to nitrates at low concentrations and superior selectivity for the nitrate ion than those using other tetraoctylammonium nitrateneutral carrier. The best limit range of the electrodes was ~5.13×10-6 mol/L and its calibration curve slop was 58.34 mV/decade, when we used the NPOE plasticizer. The 90% response time was less than 32 sec. and the stabilization time was 38 sec. These electrode continuously contacted 10-5 mol/L soln. sample and the distilled water for six weeks without any loss of performance. Especially these electrodes have shown the best selectivity in the anion soln. sample and best stability of e.m.f..
Abstract
In this paper, the potentiometric sensors with the new neutral carriers were introduced. These electrodes were poly aniline solid contact electrodes with PVC matrix. The poly aniline layer was prepared by aniline electropolymerization on platinum substrate from Hydrochloric acid solution. The PVC layer was built with the PVC, the plasticizer and the neutral carriers, that were tetraoctylammonium bromide and tetraoctylammonium nitrate. The electrodes based on these neutral carriers that selective respond in soln. sample to nitrate ion. The electrode using tetraoctylammonim bromide as the neutral carrier showed the best response to nitrates at low concentrations and superior selectivity for the nitrate ion than those using other tetraoctylammonium nitrateneutral carrier. The best limit range of the electrodes was ~5.13×10-6 mol/L and its calibration curve slop was 58.34 mV/decade, when we used the NPOE plasticizer. The 90% response time was less than 32 sec. and the stabilization time was 38 sec. These electrode continuously contacted 10-5 mol/L soln. sample and the distilled water for six weeks without any loss of performance. Especially these electrodes have shown the best selectivity in the anion soln. sample and best stability of e.m.f..
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