A Porphyrin Based Potentiometric Sensor for Zn2 DeterminationReport as inadecuate


A Porphyrin Based Potentiometric Sensor for Zn2  Determination


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1

Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee 247 667 Uttaranchal India

2

Department of Chemistry and Technology, Technical Faculty Bor, University of Belgrade, P.O.Box 50, 19219 Bor, Serbia

3

Department of Inorganic Chemistry, Technical University Chemnitz, Strasse der Nationen 62, Chemnitz, D-09111,Germany





*

Author to whom correspondence should be addressed.



Abstract PVC based membranes of disodium salt of porphyrin 3,7,12,17-tetramethyl-8, 13-divinyl 2,18-porphine dipropionic acid I as ionophore with sodium tetra phenyl borate NaTPB as anion excluder and dibutyl phthalate DBP, dioctyl phthalate DOP, dibutyl butyl phosphonate DBBP, tris2- ethyl hexylphosphate TEP, tri-n-butylphosphate TBP and 1- chloronaphthalene CN as plasticizing solvent mediators were prepared and constructed for determination of ZnII. The PVC based membrane of I with DBBP as plasticizer and having anion excluder, NaTPB in the ratio PVC: I: NaTPB: DBBP 150: 10: 2: 200 gave the best results in terms of working concentration range 1.3×10-5-1.0 ×10-1M with a Nernstian slope 30.0 mV-decade of activity. The useful pH range of the sensor is 3.0 –7.4, beyond which a drift in potential was observed. The response time of the sensor is 10s and the lifetime was about 2 months during which it could be used without any measurable divergence. It had good stability and reproducibility. The membrane worked satisfactorily in non-aqueous medium up to 40% v-v non-aqueous content. The selectivity coefficient values indicate that the electrode is highly selective for Zn2+ over a number of other cations except Na+ and Cd2+. Although Na+ and Cd2+ are likely to cause some interference, they would not interfere if present at the concentrations 1 ×10-5 and 5 ×10-5 M, respectively. The electrode has been used as an indicator electrode to determine the end point in the potentiometric titration of Zn2+ with EDTA. View Full-Text

Keywords: Poly vinyl chloride PVC; Nernstian slope; Zinc selective electrode; Porphyrin Poly vinyl chloride PVC; Nernstian slope; Zinc selective electrode; Porphyrin





Author: V. K. Gupta 1,* , D. K. Chauhan 1, V. K. Saini 1, Shiva Agarwal 1, M. M. Antonijevic 2 and H. Lang 3

Source: http://mdpi.com/



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