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The fabrication of an optical sensor membrane is described for the determination of Hg2+ ions based on the immobilization of 5-(2′,4′-dimethyl-phenylazo)-6-hydroxypyrimidine-2,4-dione (DMPAHPD) on a triacetyl-cellulose membrane. The membrane responds to mercury ions by changing color reversibly from orange to deep red in thiel buffer solution at pH 8.5. Under optimum conditions, the proposed membrane...
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