TITLE

Fabrication of a PVC-Membrane Electrochemical Sensor Based on 4-(3-Nitrophenyl)-2,6-di-2-thienylpyridine as a Sensing Material for Determination of Thulium(III) Ions

AUTHOR(S)
Hatamluyi, Behnaz; Zamani, Hassan Ali; Behmadi, Hossein
PUB. DATE
February 2013
SOURCE
International Journal of Electrochemical Science;Feb2013, Vol. 8 Issue 2, p2746
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new poly(vinyl chloride) (PVC)-based membrane sensor for thulium ions was prepared by employing on 4-(3-Nitrophenyl)-2,6-di-2-thienylpyridine (PTP) as an ionophore, sodium tetraphenyl borate (NaTPB) as an anion excluder, and nitrobenzene (NB) as plasticizing solvent mediator and investigated as a selective membrane sensor. The sensor responds to Tm3+ activity in a linear dynamic range of 1.0x10-7 to 1.0x10-2 mol L-1 with a Nernstian slope of 20.8±0.4 mV per decade and a detection limit of 8.0x10-8 mol L-1 at a pH range of 2.4-9.4. The electrode displays a fast response time (<10 s), and can be used for at least 2 months without any considerable divergences in the potentials. The Tm3+ membrane sensor revealed comparatively good selectivity with respect to common alkaline, alkaline earth, transition and heavy metal ions, and especially lanthanide ions. It was used as an indicator electrode in the potentiometric titration of Tm3+ ions with EDTA. The constructed sensor accuracy was investigated by the monitoring of Tm3+ ions in the mixtures of two and three different metal ions.
ACCESSION #
86068625

 

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