Fabrication of Modified Electrochemical Sensor Based on Molecularly Imprinted Polymer for Determination of Chromium

The research field of molecularly or ionic imprinted polymers is one of the important research topics of the recent decade. In the current study, a new, sensitive, high-performance electrochemical sensor was developed for the determination of chromium (VI) ion in different aqueous solutions. In order to preparation of sensor, firstly the molecularly imprinted polymer (MIP) was synthesized and applied in the carbon paste electrode (CP). The reaction of radical polymerization in the presence of 2- Hydroxyethyl methacrylate, 2,2- azobis isobutyronitrile and ethylene glycol dimethacrylate is used as a monomer, initiator, and cross linker in polymerization is applied for the final synthesis of the polymer. In the following, a modified carbon paste electrode was made using the prepared polymers for determination of chromium (VI) ions in aqueous solutions. Also for comparison, the nonimprinted polymer (NIP) particles were synthesized in a similar method but in absence of target molecules. Scanning electron microscope (SEM) images of obtained polymers showed that the MIP particles are nano scale. Under the optimum conditions, the detection limit found to 5 × 10-8 mol.L-1.The developed sensor has been successfully used for determinations of chromium (VI) ions in different samples.