Fatemeh Zahirifar - Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran
Mostafa Rahimnejad - Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran
Ghasem Najafpour - Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran
Hoda Ezoji - Department of Chemical Engineering, Noshirvani University of Technology, Babol, Iran

Fenitrothion(FNT) is one of the common organophosphorus pesticides that is widely employed for insect control in agriculture. Here, a simple, inexpensive and highly sensitive electrochemical method for the detection of FNT was developed by using zirconium oxide (ZRO2) and carbon nanotubes (CNT) as modifier for prepared as an efficient sensor for electrochemical detection of FNT. Cyclic voltammetry (CV) was used to study the effect of scan rate. The electrochemical behavior of Zro2/CNT/CPE was studied by CV and square wave voltammetry (SWV) at the working electrode. The structure and electrochemical properties of ZRO2/CNT/CPE was investigated in potassium ferricyanide 1mM solution. The influence of scan rate on the peak current of FNT on ZRO2/CNT/CPE was studied in the range of 10 to 200 mv/s. In optimal working conditions, the peak current of FNT at this modified electrode exhibited a good linear relationship (R2 =0.9883) with FNT concentration in the range of 1×10-6 to 6×10-4 M. In this paper, determination of FNT using ZRO2/CNT/CPE is explained. CNT and ZRO2 display high electro catalytic activity to FNT which provides sensitivity and selectivity of the modified carbon paste electrode. The fabricated electrochemical sensor displayed a linear and sensitive response to FNT. The obtained linear range was within the concentration range of 1×10-6 to 6×10-4 M. The detection limit was found in the presence of DNA to be 5.6×10-7. So this fabricated electrochemical sensor was successfully used for determination of FNT.

biosensor, carbon nanotube, cyclic voltammetry, fenitrothion, pesticide