Abstract
A novel Dy(III) ion-selective PVC membrane sensor has been introduced, based on 6-Hydrazino-3-methyl-1,5-diphenyl-4H-pyrazolo[3,4-d]pyrimidine-4-imine (HMDPPI), as an excellent sensing material. The electrode performance includes a Nernstian slope of 19.5 + - 0.4 mV per decade across a wide concentration range between 1.0 X 10~(-1) and 1.0 X 10~(-6) M and a detection limit of 6.4 X 10~(-7) M. The sensor possesses the advantages of short conditioning time, fast response time (<10 s) and, especially, great selectivity towards transition and heavy metal and some mono, di and trivalent cations. The recommended electrode was effectively used as an indicator electrode in the potentiometric titration of Dy(III) ions with EDTA. The membrane sensor was also applied to the F" ions determination in some mouth washing solutions and to the Dy~(3+) determination in binary mixtures.
NSTL