Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 408, Issue 24, Pages 6769-6779Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-016-9802-7
Keywords
Electrochemical sensor; Molecularly imprinted polymer; Nanoparticles; Diazinon
Funding
- Electroanalytical Chemistry Research Centre of Iran University of Science and Technology
- Pharmaceutical Research Center of Mashhad University of Medical Sciences
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In this research, an electrochemical sensor based on molecularly imprinted polymer (MIP) nanoparticles for selective and sensitive determination of diazinon (DZN) pesticides was developed. The nanoparticles of diazinon imprinted polymer were synthesized by suspension polymerization and then used for modification of carbon paste electrode (CPE) composition in order to prepare the sensor. Cyclic voltammetry (CV) and square wave voltammetry (SWV) methods were applied for electrochemical measurements. The obtained results showed that the carbon paste electrode modified by MIP nanoparticles (nano-MIP-CP) has much higher adsorption ability for diazinon than the CPE based non-imprinted polymer nanoparticles (nano-NIP-CP). Under optimized extraction and analysis conditions, the proposed sensor exhibited excellent sensitivity (95.08 mu A L mu mol(-1)) for diazinon with two linear ranges of 2.5 x 10(-9) to 1.0 x 10(-7) mol L-1 (R (2) = 0.9971) and 1.0 x 10(-7) to 2.0 x 10(-6) mol L-1 (R (2) = 0.9832) and also a detection limit of 7.9 x 10(-10) mol.L-1. The sensor was successfully applied for determination of diaznon in well water and apple fruit samples with recovery values in the range of 92.53-100.86 %.
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