Determination of nickel in crude oil using voltammetry method

In this thesis, the determination of nickel, which is one of the metals with the highest density as a heavy metal in crude oil, was carried out using voltammetry method, which is one of the electroanalytical methods. Nickel gave a very sensitive response around -0.15 V in Britton-Robinson (pH = 3.0) environment on the boron-doped diamond electrode surface activated cathodically at -3.0 V in 0.5 M H2SO4 environment. The developed square wave voltammetric method was found to be linear in the concentration range of 0.05-0.6 μM in BR (pH 3.0) medium, and the observability limit and the lowest detection limit were found to be 0.003 μM and 0.01 μM, respectively. The proposed method has been successfully applied to the crude oil sample.