Screen printed graphite electrode modified with two-dimen-sional leaf-like zeolitic imidazolate framework-L (Zn) for efficient electrochemical sensing of sulphite

In this paper, we describe the use of a screen-printed graphite electrode modified with a two-dimensional leaf-like zeolitic imidazolate framework-L (Zn), ZIF-L (Zn) for the deter¬mination of sulphite. We started by using linear sweep voltammetry to investigate the redox properties of the modified electrode at different scan rates (10 to 400 mV s-1). Next, we evaluated sulphite oxidation in the modified electrode. Using differential pulse voltammetry (DPV), the linear dynamic range of 0.04-900.0 µM and the limit of detection (3s/m) of 0.01 μM were obtained. DPV was also used to quantify sulphite in various real samples using the standard addition method.