Pencil Lead Electrode Modified with Gold Thin Layer for Voltammetric Detection of Chromium (VI)

Trisna Kumala Sari; Riga Riga; Moondra Zubir

doi:10.24036/eksakta/vol22-iss2/265

EKSAKTA: Berkala Ilmiah Bidang MIPA

Open Access

Pencil Lead Electrode Modified with Gold Thin Layer for Voltammetric Detection of Chromium (VI)

Trisna Kumala Sari ¹

, Riga Riga ¹

, Moondra Zubir ²

¹ Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Padang, Padang, Indonesia

² Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan, Medan, Indonesia

Published 2021-06-27

Vol. 22 No. 2 (2021) PAGES 145-153

DOI 10.24036/eksakta/vol22-iss2/265

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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 ÂµM to 100 ÂµM with a detection limit of 2.3 ÂµM achieved.

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