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Sensors 2002, 2(5), 164-173; doi:10.3390/s20500164
Article

Membranes of 5,10,15,20-Tetrakis(4-Methoxyphenyl) Porphyrinatocobalt (TMOPP-Co) (I) as MoO42- - Selective Sensors

* , ,  and
Department of Chemistry, Indian Institute of Technology Roorkee, (formerly University of Roorkee), Roorkee- 247667, India
* Author to whom correspondence should be addressed.
Received: 26 April 2002 / Accepted: 9 May 2002 / Published: 12 May 2002
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Abstract

Polyvinyl chloride (PVC) membrane electrodes based on porphyrin 5,10,15,20-tetrakis(4methoxyphenyl)porphyrinatocobalt (TMOPP-Co) (I) incorporating sodium tetra phenyl borate (NaTPB) as anion excluder and dibutyl phthalate (DBP), dioctyl phthalate (DOP), dibutyl butyl phosphonate (DBBP), tri-n-butyl phosphate (TBP), and 1-chloronaphthalene (CN) as plasticizing solvent mediators were prepared and tested for selective detection of molybdate ions. The membrane having anion excluder, NaTPB and DBP as plasticizer (membrane no. 2) proved to be best in terms of working concentration range 5.0×10-5 – 1.0×10-1M with a near – Nernstian slope of 32.0±1.0 mV/decade of activity over the pH range 5.4- 10.5. The response time of this sensor is 18s with a lifetime of about 4 months. The sensor can be used in non-aqueous medium with no significant change in the value of slope or working concentration range for the estimation of MoO42- in solutions having up to 25% (v/v) non-aqueous fraction.
Keywords: Poly(vinyl)chloride (PVC); Near-Nernstian slope; Molybdate selective electrode; Membrane electrode Poly(vinyl)chloride (PVC); Near-Nernstian slope; Molybdate selective electrode; Membrane electrode
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Gupta, V.K.; Chandra, S.; Chauhan, D.K.; Mangla, R. Membranes of 5,10,15,20-Tetrakis(4-Methoxyphenyl) Porphyrinatocobalt (TMOPP-Co) (I) as MoO42- - Selective Sensors. Sensors 2002, 2, 164-173.

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