Potentiometric determination of Cu²⁺ ions in environmental samples using a newly developed Cu²⁺-selective electrode based on schiff base

In this study, we investigated the possibility of preparing ion-selective electrodes for cationic species by using a newly synthesized schiff base. pvc-membrane compositions in different ratios were prepared by using schiff base complex, polyvinylchloride, o-nitrophenyl octylether and potassiumtetrakis parachlorotetraphenylborate. the prepared membrane compositions were coated on the surfaces of solid state contact electrodes and ion selective electrodes were fabricated. potentiometric measurements showed that; prepared electrodes exhibited selective behavior towards cu2⁺ ions. the most suitable membrane composition of electrode was determined as 3.9% ionophore, 32.0% polyvinylchloride, 64.0% o-nitrophenyl octylether (plasticizer) and 0.1% potassiumtetrakis parachlorotetraphenylborate. the prepared cu2⁺-selective electrode showed potentiometric working range to cu²⁺ between the concentration of 1.0×10-5 and 1.0×10-1 m with a slope of 29.8±0.7 mv per decade (r2= 0.9966) in the presence of the common cationic species. it was observed that the electrode reached the equilibrium potential within 5 seconds and had a limit of 4.1×10-6 m. it was tested that the developed electrode exhibited potentiometric behavior at ph = 3.0-8.0 without being affected by the ph change of the test solutions. in addition, the potentiometric cu²⁺-selective electrode had 12-week lifetime. the electrode was successfully used in the potentiometric titration of cu²⁺ ions with edta and the potentiometric determination cu²⁺ ions in water samples with different matrix structures such as tap water, river water and dam water.