%0 Journal Article
%T PVC Based Selective Sensors for Ni2+ Ions Using Carboxylated and Methylated Porphine
%A L. P. Singh
%A J. M. Bhatnagar
%J Sensors
%D 2003
%I MDPI AG
%R 10.3390/s30900393
%X Poly vinylchloride (PVC) based membranes of 4,4',4'',4'''-21H,23H-porphine每5,10,15,20 每tetrayl) tetrakis (benzoic acid) (TBAP) and 2,3,7,8,12,13,17,18-octamethyl - 21H, 23H-porphine (OMP) were prepared using dibutyl phthalate (DBP), dioctylphthalate (DOP), dibutyl(butyl)phosphonate (DBBP) and 1-chloronaphthalene (CN) as plastcizing solvent mediators and sodium tetraphenylborate (NaTPB) as an anion excluder for Ni2+ selective sensors. TBAP based membrane exhibits linearity over a wide concentration range 2.0x10-6每1.0x10-1M (0.12 每 5.8x103ppm) with a slope of 29.6 mV/decade of activity while OMP based membrane showed linear potential response in the concentration range 1.0x10-5 每1.0x 10-1M (0.60 每 5.8x103ppm) with a Nernstian slope of 29.0 mV/decade of activity. The electrode assembly works between pH 2.0 每 7.0, exhibits a fast response time of 10-15s and performed satisfactorily over a period of six months with good reproducibility. Excellent selectivity of the order of 10-3 over a number of cations and quantitative determination of Ni2+ in effluents discharged from electroplating industry demonstrates the utility of the proposed sensor. The electrode assembly was also used as an indicator electrode in the potentiometric titration of Ni2+ with EDTA.
%K porphine
%K Sensors
%K Ion-selective Electrodes
%K Nickel
%U http://www.mdpi.com/1424-8220/3/9/393