Synthesis of a New Oxime and Its Application to the Construction of a Highly Selective and Sensitive Co(II) PVC-Based Membrane Sensor

Autor: Mehdi Emami, Farhang Mizani, Mohammad Yousefi, Mohammad Reza Ganjali, Mohammad Raouf Darvich, Maryam Darjezini
Rok vydání: 2004
Předmět:
Zdroj: Scopus-Elsevier
ISSN: 1348-2246
0910-6340
DOI: 10.2116/analsci.20.531
Popis: A cobalt(II) ion-selective membrane sensor has been fabricated from a poly vinyl chloride (PVC) matrix membrane containing a new oxime compound (oxime of 1-(2-oxocyclohexyl)-1,2-cyclohexanediol, OXCCD) as a neutral carrier, sodium tetraphenyl borate (NaTPB) as an anionic excluder and o-nitrophenyloctylether (o-NPOE) as a plasticizing solvent mediator. The membrane sensor exhibits a linear potential response in the concentration range of 1.0 x 10(-1) - 1.0 x 10(-6) M of Co2+. The electrode displays a Nernstian slope of 29.8 mV decade(-1) in the pH range of 3.5 - 8.0. The sensor also exhibits a fast response time of25 s. The detection limit of the proposed sensor is 9.0 x 10(-7) M (approximately 40 ng/ml), and it can be used over a period of two months. The selectivity of the sensor with respect to other cations (alkali, alkaline earth, transition and heavy metal ions) is excellent. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Co2+ with EDTA and for the direct determination of Co(II) in wastewater of the electroplating industry.
Databáze: OpenAIRE
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