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Submitted
Mar 14, 2021
Accepted
May 5, 2021
Published
Jun 27, 2021
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Abstract

Cr(VI) is a toxic, mutagenic, and carcinogenic metal. This heavy metal have effect harmful on organism and the environment. In this study, an electroanalytic approach was improved for detection of the Cr(VI) using a pencil lead electrode modified with gold thin layer by cyclic voltammetry. Gold thin layer was electrodeposited on the pencil lead electrode surface with potential-sweeping technique at scan of potential from 1.2 V to 0 V. Since the Cr(VI) species depends on the pH, effect of supporting electrolytes matrix at various pH were investigated. It was found that Cr(VI) gave a reduction peak with a peak potential of 0.35 V vs Ag/AgCl in cyclic voltammogram with 0.1M HClO4 as supporting electrolyte. The calibration curve for Cr(VI) at gold thin layer modified pencil lead electrode shows linearity in range of 5 µM to 100 µM with a detection limit of 2.3 µM achieved.

Keywords

Cr(VI) Gold PLE Cyclic Voltammetry

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How to Cite
1.
Sari TK, Riga R, Zubir M. Pencil Lead Electrode Modified with Gold Thin Layer for Voltammetric Detection of Chromium (VI). EKSAKTA [Internet]. 2021Jun.27 [cited 2024Nov.21];22(2):145-53. Available from: https://eksakta.ppj.unp.ac.id/index.php/eksakta/article/view/265

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