An efficient graphene/graphite paste sensor chemically modified by diphenylcarbazone for the detection of Al(III) ions in real water samples

Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Fakiha El-Taib Heakal, Marwa El Badry Mohamed, Mostafa Mohamed SolimanAbstractThese days development of efficient, selective and fast sensors for micro-determination of Al(III) in different samples is a highly demanding area of research. This is because aluminum intake is reported to have serious negative impact on human health. In this paper, a new electrochemical Al(III) sensor is developed based on a chemically modified carbon paste electrode with graphene nanosheets and diphenylcarbazone (DPC) ionophore. This sensor is chosen based on its highest sensing efficiency among the five fabricated carbon paste electrodes with varying compositions. Out of these five, two electrodes contain graphene with their two counterparts without graphene and the fifth one has the graphite paste only. Cyclic voltammetry and electrochemical impedance spectroscopy measurements are used for Al(III) detection in Britton–Robinson (B–R) buffer solution. Voltammetry results reveal good linear relationship between anodic redox peak current and Al(III) concentration over a wide range from 10 mM down to 0.1 µM with a very low limit of detection (LOD) 31 nM for the best sensor (electrode I) modified with graphene and DPC ionophore. This modified electrode is proved to be highly sensitive and selective towards Al(III) ion detection and is successfully used for determination of Al contaminant in spiked tap water and aqu...
Source: Microchemical Journal - Category: Chemistry Source Type: research