Development of a parathion sensor based on molecularly imprinted nano-TiO2 self-assembled film electrode

Spontaneous formation of an ordered nano-TiO2/p-tert-butylcalix[4]arene hybrid thin film imprinted by parathion has been achieved by self-assembled technique, and a sensor based on the imprinted film has been constructed for the selective determination of parathion. A linear response to parathion in the concentration range of 5.0X10-8 to 1.0X10-5M was observed with a good correlation coefficient (g2=0.992). The linear regression equation was Ip (mA)=0.202C (mM)+0.797 and the detection limit of the sensor was 1.0X10-8M (S/N=3). The imprinted film sensor has been applied to the determination of parathion in spiked vegetable samples and the recoveries were varied from 93.3 to 103.3% at 0.3 and 2.0mM.