Solid-contact Hg(II)-selective electrode basedon a carbon-epoxy composite containing anew dithiophosphate-based ionophore

The experimental results herein concern a novel ion-selective electrode manufactured with an inner solid contact based on a new ligand O,O?-(2,2?-biphenylene)dithiophosphate pentyl (PenDTF). This electrode displays high selectivity toward the Hg(II) ion even in the presence of different divalent ions. The electrode also exhibited a good Nernstian response to Hg(II) (33.71.0 mV decade?1) over an ample concentration range (5.3×10?7?1.0×10?2 mol L?1), with a detection limit of (6.11.7)×10?7 mol L?1. As a result of design, the electrode can be used for many experiments, simply renewing its contact surface with emery paper, without giving rise to a significant response deviation, exhibiting a variation coefficient of 3%, capable of being tested within the 0?5 pH interval. The electrode was used satisfactorily as indicating electrode during the potentiometric titration of Hg(II) ions with EDTA.