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Complexing ability of pesticides and related compounds. Formation and stability in aqueous solution of H+ , Li+, Na+, K+, Mg2+ and Ca2+ phenoxyacetate complexes at different temperatures and ionic strengths

1985; Elsevier BV; Volume: 95; Issue: 1 Linguagem: Inglês

10.1016/0040-6031(85)80028-9

1872-762X

Agatino Casale, Alessandro De Robertis, Silvio Sammartano,

Electrochemical Analysis and Applications

Abstract The formation constants of Li + , N + , K + , Mg 2+ and Ca 2+ phenoxyacetate complexes were determined potentiometrically using an (H + )-glass electrode at 10, 25, 37 and 45°C, at several ionic strengths, in the range 0.04⩽ I ⩽ 0.9 mol 1 −1 . Simple empirical equations for the dependence of the formation constants on ionic strength were derived. From the temperature coefficients, estimates of Δ H o and Δ S o were obtained.