Determination of Cobalt(II) by a New PVC Membrane Coated Graphite Electrode Based on 6-chloro-11- azabenzo[a]phenothiazin-5-one as a neutral ion carrier

Cobalt has great biological effects on human beings and also other living organisms, hence itsdetermination is very important. in this regard, a novel coated graphite electrode was designed fordetermination of co^2+ ions by exploiting 6-chloro-11- azabenzo[a]phenothiazin-5-one as a neutralion carrier, for the first time. the foremost function was witnessed from the membrane compositionof pvc (29%), potassium tetrakis (4-chlorophenyl) borate (2%) as an ionic additive,6-chloro-11-azabenzo[a]phenothiazin-5-one (9%) as ionophore and dioctylphthalate (60%) as plasticizer. thelinearity domain of the membrane sensor was from 5×10^-7 to 1×10^-2 mol l^-1 with the nernstianslope value of 30.1 mv.decade-1. the potential response of the designed electrode was also investigated in non-aqueous mediums and it was found out that the electrode is also able to be usedin systems that are entailed of 20% of ethanol and acetone organic solvents. the response time andlifespan of the electrode was 5 s and 3 months respectively. the sensor selectivity was alsoevaluated by match potential method over other cations and it shows an eminent selectivity towardsco2+ over all of the inspected ions. the applicability of the electrode in the potentiometric titrationwith edta was also investigated. in the end, the proposed electrode was utilized for determinationof co2+ in four aqueous specimens as real samples.