All Solid State Graphene Based Potentiometric Sensors forMonitoring of Mercury Ions inWasteWater Samples

Document Type : Original Research Paper

Authors

1 Center of Excellence in Electrochemistry,Faculty of Chemistry,University of Tehran,Tehran, Iran

2 Departments of Occupational Health, School of Public Health, and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran

Abstract

In this work, all-solid-state potentiometric PVC membrane sensor was introduced for fast and
simple monitoring of mercury ions in waste water samples. The all solid sate electrode is made based on a
conductive composite of graphite, reduced graphene oxide, epoxy resin on a copper wire. A thin layer PVC
membrane 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 element
of the sensor is an artificial host which is imprinted by vinyl pyridine and a suitable cross-linker. The sensor
shows a Nernstian response of 29.4±0.3 mV/decade. Dynamic linear range of the sensor is 1.0×10-8-1.0×10-3
mol/L of the mercury concentration and detection limit of 3.2×10-9 mol/L. The interference of different ionic
species with the response of the electrode shows a good selectivity of the proposed sensor. The proposed sensor
is successfully applied in determination of mercury ions in some waste water samples.

Keywords

International Journal of Environmental Research
Volume 9, Issue 1 - Serial Number 1
January 2015
Pages 333-340

Files

Share

How to cite

Statistics