Eksakta : Berkala Ilmiah Bidang MIPA
Vol. 22 No. 2 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)

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

Trisna Kumala Sari (Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Padang, Padang, Indonesia)
Riga Riga (Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Padang, Padang, Indonesia)
Moondra Zubir (Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Negeri Medan, Medan, Indonesia)

Article Info

Publish Date
27 Jun 2021

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.

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Journal Info
Eksakta : Berkala Ilmiah Bidang MIPA
Website

Abbrev

eksakta

Publisher

Universitas Negeri Padang

Subject

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering

Description

Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) is an open access journal and peer-reviewed that publishes either original article or reviews. The journal is dedicated towards dissemination of knowledge related to the advancement in scientific research. The prestigious interdisciplinary ...