An organically modified sol-gel membrane for detection of lead ion by using 2-hydroxy-1-naphthaldehydene-8-aminoquinoline as fluorescence probe

A fluorescent reagent, 2-hydroxy-1-naphthaldehydene-8-aminoquinoline (HNAAQ) was synthesized, and an organically modified sol-gel membrane for detection of lead ion by using HNAAQ as fluorescence probe was fabricated. Under the optimum conditions, by a coplanar effect and the degree of molecular conjugation due to the complexation of Ph2+ with HNAAQ the relative fluorescence intensity I-100/I-0 of the sensing membrane is linearly increased over the Pb2+ concentration range of 1.9 x 10(-7) to 1.9 x 10(-4) mol/L with the detection limit of 8.3 x 10(-8) mol/L. The preparation of this organically modified sol-gel membrane and its characteristics were investigated in detail. (c) 2007 Elsevier B.V. All rights reserved.