Luminescent Probe for Crotoxyphos Pesticide Detection Based on Eu (III) Complex with 7-Hydroxy-Coumarin-4-Acetic Acid

Abstract

Luminescent Europium complex based on7-hydroxy-coumarin-4-aceticas ligand was investigated as a probe for the detection of organophosphorus pesticides. The complex exhibited an interesting action towards Crotoxyphos pesticide. The luminescence of the Eu(III)-7-hydroxy-coumarin-4-acetic was remarkably enhanced by gradual addition of Crotoxyphos. Limit of detection (LOD) = 1.86 µM and limit of quantitation (LOQ) = 6.19µM. Binding constant at different temperatures was calculated according to Benesi-Hildebrand equation. The thermodynamic parameters DH, DS and DG were calculated for characterization of the nature of force due to interaction of the complex with Crotoxyphos. Finally, the effect of interfering anion and cations that naturally occur in water and soil was studied, in addition; interference of some pesticides was studied.