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A composite graphite (CG) electrode modified with poly(2,6-diaminopyridine) (PDAP) was used as solid state-ion selective electrode for determination of mercury. The electrooxidation of monomer 2, 6 diaminopyridine (DAP) onto CG was accomplished from the 30 mM DAP in 5% H 2 SO 4 and 0.5 M ZnSO 4 . The electrode displayed Nernstian response with slope of 28.4 AE 1 mV decade À1 in concentration range of 1 Â 10 À6 to 1 Â 10 À1 M and in solution of pH 3 -5. The limit of detection for electrode was 3 Â 10 À8 M with response time of 25 s. The electrode was also suitable as an indicator electrode in the potentiometric titration of Hg 2þ with iodide.