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Fluorescence quenching of 1-dodecyl-β-Naphthoate（Np-12）by para-nitrophenyl alkanoates（Cn,n=2,8,12,16,18,20）was investigated inboth 40:60 v/v（φ=0.40）dioxane（DX）-H<sub>2</sub>O mixture and pure dioxane.Thefluorescence quenching rate constants,kq