Development of an optode for detection of trace amounts of Hg2+ in different real samples based on immobilization of novel tetradentate Schiff bases bearing two thiol groups in PVC membrane.

A very sensitive and reversible optical chemical sensor based on a novel tetradentate Schiff base namely N.N(/)bis(2-aminothiophenol)benzene-1,2-dicarboxaldehyde (ATBD) immobilized within a plasticized PVC film for Hg(2+) determination is described. At optimum conditions (i.