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Study of Glassy Carbon Electrode Preparation Modified by Gold Nanoparticle and Its Application Towards the Determination of Chromium(VI) with the Influence of Chromium(III), Nickel(II) and Zinc(II) using Voltammetry

Study of Glassy Carbon Electrode Preparation Modified by Gold Nanoparticle and Its Application Towards the Determination of Chromium(VI) with the Influence of Chromium(III), Nickel(II) and Zinc(II) using Voltammetry
Santhy Wyantuti, Roekmi-ati Tjokronegoro

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Santhy Wyantuti, Roekmi-ati Tjokronegoro

The current advance in nanotechnology goes through an innovation in the analysis using voltammetry method. One of the innovations is by taking advantage of electrode that is modified by gold nanoparticle. Gold nanoparticle is sensoric material that works through non specific interaction. Beside that, gold nanoparticle can be modified using glassy carbon so that it can increase its analysis performance in the determination of chromium (IV). Chromium with highest toxicity level is present as chromium (IV). An effective and fast method to analyse the toxic chromium (IV) is needed. However, the influence of chromium (III), nickel (II) and zinc (II) needs to be anticipated in the electrochemical analysis of chromium (IV) as these ions have similar electrochemical properties with chromium (IV). Voltammetry method with differential pulse has been applied for the determination of chromium (IV) using glassy carbon electrode that is modified by gold nanoparticle. This method involves the preparation of gold nanoparticle and the electrode modification of glassy carbon through self-assembly. The electrode performance for the determination of chromium (IV) resulted in concentration range of 0.050 – 0.250 μg/L, sensitivity of 2.25 x 10-3 and accuracy of 94.00%. Study of the metallic ions influence showed that chromium (III), zinc (II) and nickel (II) did not give any significant influence in the measurement.

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