Electrochemical determination of sulfide in fruits using alizarin–reduced graphene oxide nanosheets modified electrode

•Sensitive electrocatalytic response to sulfide was showed on Az–rGO modified GCE.•The fabricated Az–rGO/GCE sensor exhibited good selectivity.•The proposed method is reliable in detection of sulfide in H2S-pretreated fruit samples. This study presents a new approach for rapid detection of sulfide using a glassy carbon electrode (GCE) modified with alizarin (Az) and reduced graphene oxide (rGO) nanosheets. The fabricate Az–rGO/GCE sensor shows a notable electrocatalytic activity to sulfide oxidation. The currents of anodic peak centered at +465mV in 0.2M pH 7.0 phosphate buffer were related linearly to the concentrations of sulfide, based on the cyclic voltammetric studies. The linear range was 0.002–3.28mM, and the detection limit was 1μM. The proposed method was applied in sulfide determination of hydrogen sulfide pretreated fruits, and the method was also verified with recovery studies.