Thiol surfactant assembled on gold nanoparticles ion exchanger for screen-printed electrode fabrication. Potentiometric determination of Ce(III) in environmental polluted samples

A new modified screen-printed electrode (SPE) based on a recently synthesized ligand 1,4-bis-(8-mercaptooctyloxy)-benzene (I), self-assembled to gold nanoparticles (GNP) as suitable carrier for Ce(III) ion determination with potentiometric method is described. The proposed potentiometric method was based on the fabrication of modified gold nanoparticles-screen-printed ( GNPs-SPE) and modified screen-printed (MSPE) sensors. These potentiometric sensors respond to Ce(III) ions in the wide linear range of 3.25 x 10(-10) to 1.0 x 10(-1) and 1.0 x 10(-7) to 1.0 x 10(-2) mol L-1 with Nernstian slopes of 19.95 +/- 0.97 and 17.04 +/- 1.02 mV decade(-1) for GNPs-SPE and MSPE, respectively. The detection limit of 3.25 x 10(-1) and 9.5 x 10(-8) mol L-1 was obtained at pH range 2.8-8.5 and 3.5-7.5 for GNPs-SPE and MSPE, respectively. It has a fast response with response time of about 4 and 7s, and can be used for at least 7 and 5 months without any considerable divergences in the potentials for GNPs-SPE and MSPE, respectively. Such abilities promote new opportunities for determining Ce(III) ions in a wide range of real samples. The results obtained compared well with those obtained using inductively coupled plasma atomic absorption spectrometry (ICP-AES). (C) 2013 Elsevier B.V. All rights reserved.