all solid state graphene based potentiometric sensors formonitoring of mercury ions inwastewater samples

in this work, all-solid-state potentiometric pvc membrane sensor was introduced for fast andsimple monitoring of mercury ions in waste water samples. the all solid sate electrode is made based on aconductive composite of graphite, reduced graphene oxide, epoxy resin on a copper wire. a thin layer pvcmembrane is then coated on the surface of the new conducting transducer. pvc membrane is composed of 30%pvc, 62% npoe as plasticizer, 3% ionic liquid, and 5% hg2+ ion imprinted polymer (iip). the sensing elementof the sensor is an artificial host which is imprinted by vinyl pyridine and a suitable cross-linker. the sensorshows a nernstian response of 29.4±0.3 mv/decade. dynamic linear range of the sensor is 1.0×10-8-1.0×10-3mol/l of the mercury concentration and detection limit of 3.2×10-9 mol/l. the interference of different ionicspecies with the response of the electrode shows a good selectivity of the proposed sensor. the proposed sensoris successfully applied in determination of mercury ions in some waste water samples.