LAUSR

Abstract The interaction between luminescent Eu(TAN) 2 (Phen) ternary complex (where TAN = 4,4,4-Trifluoro-1-(2-naphthyl)-1,3-butanedione and Phen = 1,10 phenanthroline) with prometryne and aldicarb sulfoxide was studied by fluorescence spectroscopic technique. The results showed that the luminescence of europium complex was strongly quenched at λ = 614 nm by prometryne and aldicarb sulfoxide at pH 7.4 using PIPES buffer solution. The quenching mechanism was discussed to be a static quenching procedure, which was proved by the Stern Volmer (K SV ) constants at different temperatures where the detection limits are 0.33 and 0.18 μmol L −1 for prometryne and aldicarb sulfoxide, respectively. According to Lineweaver–Burk equation at different temperatures, the thermodynamic parameters, ΔH, ΔS and ΔG associated with the interaction of the complex with the two pesticides were calculated.