Luminescence quenching of a novel long lived Eu(III)–pyridine-2,6-dicarboxylic acid probe of 1:2 stoi-chiometric ratio has been studied in 0.10 volume fraction ethanol–water mixture at pH 7.5 (HEPES buffer)in the presence of the organophosphorus pesticides chlorfenvinphos (P1), malathion (P2), azinphos (P3),and paraxon ethyl (P4). The luminescence intensity of Eu(III)–(PDCA)2probe decreases as the concen-tration of the pesticide increases. It was observed that the quenching due to P3 and P4 proceeds viaboth diffusional and static quenching processes. Direct methods for the determination of the pesticidesunder investigation have been developed using the luminescence quenching of Eu(III)–pyridine-2,6-dicarboxylic acid probe in solution. The linear range for determination of the selected pesticides is1.0–35.0 M. The detection limits were 0.24–0.55 M for P3, P4, and P1 and 2.5 M for P2, respectively.The binding constants (K), and thermodynamic parameters of the OPs with Eu(III)–(PDCA)2were

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