Abstract
Quenching of lanthanides luminescence of a novel long live Tb(III)- Ethyl 1-allyl-1,2-dihydro-4-hydroxy-2-oxoquinoline-3-carboxylate (EADHOC) as a ligand to form a complex with molar ratio 1:3 in solution has been studiedin ethanol in presence of organophosphorus pesticides both Di-chlorvos (P1) and paraoxon-Ethyl (P2). The intensity ofluminescence of Tb(III) –(EADHOC) decrease as the concentration of pesticides increase. The quenching effect wasobserved with both pesticides. Direct methods of determination of pesticides under investigated have been developed byusing luminescence of Tb(III) –(EADHOC) probe in a solution. The linear range for determination of the selectedpesticides P1(Di-chlorovos) and P2(Paraoxon-Ethyl) is 7 and 1 μM. the detection limits were 1.9 and 9.8 μM for P1(Dichlorovos)and P2 (Paraoxon-Ethyl) respectively. The Thermodynamic parameters and binding constant (K) of OPswith Tb(III) – (EADHOC) were evaluated. Including the value of enthalpy (ΔH ) and entropy( ΔS ) changes for Probeinteraction with pesticides. As the natural water sample in this study don't contain the above mentioned OPs over thelimit detected by the methods, a recovery study was carried out after the addition of the adequate amount oforganophosphorus pesticides under investigation.
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