Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Portable Amperometric Perchlorate Selective Sensors with Microhole Array-water/organic Gel Interfaces

  • Lee, Sang Hyuk (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Kim, Hyungi (The BIO Co., Ltd.) ;
  • Girault, Hubert H. (Laboratoire d'Electrochimie Physique et Analytique, Station 6, Ecole Polytechnique Federale de Lausanne) ;
  • Lee, Hye Jin (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University)
  • Received : 2013.05.12
  • Accepted : 2013.06.02
  • Published : 2013.09.20
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Abstract

A novel stick-shaped portable sensing device featuring a microhole array interface between the polyvinylchloride-2-nitrophenyloctylether (PVC-NPOE) gel and water phase was developed for in-situ sensing of perchlorate ions in real water samples. Perchlorate sensitive sensing responses were obtained based on measuring the current changes with respect to the assisted transfer reaction of perchlorate ions by a perchlorate selective ligand namely, bis(dibenzoylmethanato)Ni(II) (Ni(DBM)2) across the polarized microhole array interface. Cyclic voltammetry was used to characterize the assisted transfer reaction of perchlorate ions by the $Ni(DBM)_2$ ligand when using the portable sensing device. The current response for the transfer of perchlorate anions by $Ni(DBM)_2$ across the micro-water/gel interface linearly increased as a function of the perchlorate ion concentration. The technique of differential pulse stripping voltammetry was also utilized to improve the sensitivity of the perchlorate anion detection down to 10 ppb. This was acquired by preconcentrating perchlorate anions in the gel layer by means of holding the ion transfer potential at 0 mV (vs. Ag/AgCl) for 30 s followed by stripping the complexed perchlorate ion with the ligand. The effect of various potential interfering anions on the perchlorate sensor was also investigated and showed an excellent selectivity over $Br^-$, $NO_2{^-}$, $NO_3{^-}$, $CO{_3}^{2^-}$, $CH_3COO^-$ and $SO{_4}^{2^-}$ ions. As a final demonstration, some regional water samples from the Sincheon river in Daegu city were analyzed and the data was verified with that of ion chromatography (IC) analysis from one of the Korean-certified water quality evaluation centers.

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