Electrochemically reduced graphene modified electrode and its electrochemical application

A glassy carbon electrode was modified by single- step electrodeposition of graphene( R- GO) for the rapid detection of cadmium and the electrochemical behavior on this electrode was investigated at the same time.The oxidation peak current of Cd2 +increased at the R- GO / GCE compared with bare GCE. A sensitive and fast analysis method( differential pulse voltammetry,DPV) of Cd2 +in food systems was established.Under the optimum conditions,a linear relationship existed between electrical peak current and the concentration of Cd2 +in the range between 4 × 10- 8g / L and 3 × 10- 5g / L,with a detection limit of 3.0 × 10- 9g / L,the RSD for cadmium( concentration= 4.0 × 10- 6g / L,n = 6) was 8.53%. This method has been applied to the detection of Cd2 +in rice with a successfully result,the average recoveries are between 96.25% ~ 111.25%. R- GO / GCE demonstrated an extraodinary satability and reproducibility,a better detection limit compared with GCE.The combination of R- GO /GCE and DPV turned out to be a solid,efficient and sensitive method and technical support for the rapid detection of cadmium in food.