V. Gupta, R. Prasad, Pankaj Kumar
Sep 7, 2000
Citations
0
Influential Citations
263
Citations
Quality indicators
Journal
Analytica Chimica Acta
Abstract
Abstract 5,7,12,14-Tetramethyldibenzotetraazaannulene (Me 4 Bzo 2 TAA) has been explored as an electroactive material for preparing poly(vinyl chloride) (PVC)-based membrane electrodes selective to Ni 2+ . The membrane having the constituents Me 4 Bzo 2 TAA, sodium tetraphenyl borate (NaTPB) and PVC in the optimum ratio 2:1:97 (w/w) gave the best working concentration range (7.9×10 −6 –1.0×10 −1 M) with a Nernstian slope (30.0+−1.0 mV/decade of activity) in the pH range 2.7–7.6. The sensor exhibits a fast response time of 15 s. The electrode shows good selectivity for nickel(II) over a number of mono-, bi- and tri-valent cations. Analytical application of the electrode has been investigated for the quantitative determination of Ni 2+ in chocolates and the sensor has been successfully used as an indicator electrode in the potentiometric titration of Ni 2+ against EDTA.