A PVC-based 1,8-diaminonaphthalen electrode for selective determination of vanadyl ion.
A PVC membrane vanadyl (VO(2+)) ion-selective electrode was constructed using 1,8-diaminonaphthalen (DAN) as a neutral carrier. The electrode shows good Nernstian response for VO(2+) ions over a wide concentration range (1.0x10(-1)-1.0x10(-5) M). The optimum composition of the membrane was 55 wt.% poly(vinylchloride), 35 wt.% 2-nitrophenyl octyl ether (NPOE), 5 wt.% ionophore, and 5 wt.% potassium tetrakis(p-chlorophenyl)borate (KTpClPB). It has relatively fast response time and can be used at least for 5 weeks without any considerable divergence in potentials. The proposed electrode revealed relatively good selectivity for VO(2+) over wide variety of other metal ions. The electrode was used for the potentiometric titration of VO(2+) ions with EDTA.
Akbari
A
A
Department of Chemistry, School of Sciences, Tarbiat Modarres University, P.O. Box 14115-111, Tehran, Iran.
Mousavi
M F
MF
Shamsipur
M
M
Rahmanifar
M S
MS