Fabrication of PVC Based Membrane Using Nickel Porphyrazine as Ionophore in the Screening of Thiocyanate Ion in Aqueous and Real Samples

Title: Fabrication of PVC Based Membrane Using Nickel Porphyrazine as Ionophore in the Screening of Thiocyanate Ion in Aqueous and Real Samples

Volume: 7 Issue: 4

Author(s): Azad Kumar, Rajendra Prasad and Vinod K. Gupta

Affiliation:

Keywords: nickel porphyrazine, sensor, selectivity, scn -, Ionophore

Abstract: The [Ni{(TAP)(SBn)8}] complex (I), i.e. ({2,3,7,8,12,13,17,18-octakis(benzylthio)-5,10,15,20- tetraazaporphyrin})nickel(II), has been explored as an ionophore for fabrication of the PVC based membrane electrodes used in the screening of thiocyanate anion (SCN-). The membrane having [Ni{(TAP)(SBn)8}] complex (I) as an electroactive material and dioctylphthalate (DOP) as plasticizer in the PVC matrix with the percentage ratio 5 : 158 : 200 (I : DOP : PVC, % w / w) exhibited a linear response in the concentration range 7.0 × 10-6 - 1.0 × 10-1 M of SCN- with a sub-Nernstian slope 32.5 ± 0.2 mV / decade of activity and a fast response time of 10 ± 2 s. The sensor works well in the pH range 3.0 - 9.5 and could be satisfactorily used in presence of 50 % (v / v) methanol, ethanol and acetone, and is selective for SCN- over a large number of anions with slight interference from iodide (I-) and azide (N3-) if present at a level ≥ 1.0 × 10-5 M. Described electrode works well over a period of six months. The sensor can be successfully applied for the screening of SCN- in both aqueous and real samples and also as indicator electrodes in precipitation titrations.

Cite this article as:

Kumar Azad, Prasad Rajendra and Gupta K. Vinod, Fabrication of PVC Based Membrane Using Nickel Porphyrazine as Ionophore in the Screening of Thiocyanate Ion in Aqueous and Real Samples, Combinatorial Chemistry & High Throughput Screening 2004; 7 (4) . https://dx.doi.org/10.2174/1386207043328779