Development of a hexavalent chromium ISFET sensor with a polymeric membrane including tributylphosphate

Abstract

International audienceThis paper presents a first report on chromium ISFET (ion-sensitive field effect transistor) based on a polymeric membrane (siloprene) including an ionophore (tributylphosphate) sensitive for hexavalent chromium. The sensor sensitivity as a function of the pH was studied; its value is minimum in a pH interval from 5.5 to 7.5. The sensitivity for hexavalent chromium was found to be 15 mV/Ioga(Cr6+) in the range of 10(-4) to 10(-2) M. The detection limit was found to be 10(-5) M. The studied interfering ions are Pb(II) and Cd(II) that do not represent a great perturbation upon the response for hexavalent chromium. (c) 2005 Elsevier B.V. All rights reserved