V. Gupta, A. Jain, L. Singh
Nov 20, 1997
Citations
0
Influential Citations
171
Citations
Quality indicators
Journal
Analytica Chimica Acta
Abstract
Abstract 5,10,15,20-tetraphenylporphyrin (TPP) and 5,10,15,20-tetra(4-methylphenyl) porphyrin (TMPP) have been explored as electroactive materials for preparing poly(vinyl chloride) (PVC) based membrane sensors selective to Ni 2+ . The membrane incorporating TMPP, sodium tetraphenylborate and a solvent mediator (dibutylphthalate) in PVC in the ratio (7 : 35 : 4 : 54) gave the best results, exhibiting Nernstian response in the concentration range 5.6× 10 −6 –1.0×10 −1 mol/l between pH 2.5–7.4 and a fast response time of 20 s. The electrode shows moderate selectivity and has been used for the quantitative determination of Ni 2+ in chocolates and also as an indicator electrode for the end point detection in the potentiometric titration of Ni 2+ against EDTA.