Preparation of a new palladium ion selective electrode based on crown ether (Dibenzo-24-Crown-8)

Abstract

The aim of this study including prepare a new selective electrode of Palladium (II) ion by
dependent on the crown ether (Dibenzo-24-Crown-8) as a sensor deposed in (PVC), the
plasticizer material in the membrane was Di-n-Octyl Phenyl Phthalate (DOPP).
This electrode gave a linear activity in the range of (5x10-7-5x10-3) mol/l with activity
unit (27.51 mV/decade) and detection limit was (2.5x10-8) mol/l with correlation factor ( r
) 0.9997, linearity (R2) 0.9994, R.S.D % (1.4) % and (Erel. Re) % were (-2.5, 97.5) %.
Factors effect on the nernast response of it is prepared electrode were studied, such as
pH, concentration of internal filing solution, temperature, time response of the electrode,
life time and the selectivity coefficient (Ki,j
pot) determined in the presence anionic and
cationic ions
The best concentration of the internal filling solution was (1x10-3) mol/l, the acidity
function (pH) between (5-7) and the best nernast response at (pH=6), temperature was
20°c, response time was between 35-55 sec., the life time of Pd-electrode was 7 days.