Main Article Content

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

Article Details

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]. 2021May14 [cited 2021Jun.12];22(2):145-53. Available from: https://eksakta.ppj.unp.ac.id/index.php/eksakta/article/view/265

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