Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Electrochemical Behaviour of a Gold Film- Glassy Carbon Electrode for Determination of Chromium (VI)

Version 1 : Received: 14 January 2021 / Approved: 19 January 2021 / Online: 19 January 2021 (13:52:45 CET)
(This article belongs to the Research Topic Quantum Computing)

How to cite: Broli, N.; Vallja, L.; Vasjari, M. Electrochemical Behaviour of a Gold Film- Glassy Carbon Electrode for Determination of Chromium (VI). Preprints 2021, 2021010382 (doi: 10.20944/preprints202101.0382.v1). Broli, N.; Vallja, L.; Vasjari, M. Electrochemical Behaviour of a Gold Film- Glassy Carbon Electrode for Determination of Chromium (VI). Preprints 2021, 2021010382 (doi: 10.20944/preprints202101.0382.v1).

Abstract

A gold nanostructured film modified glassy carbon electrode (Aufilm/GCE) was developed for the determination of chromium (VI) in water sample. GCE was immersed into HAuCl4 solution (10-3M) and electrodeposition of thin gold layer was conducted at –0.4 V (vs Ag/AgCl) for 10 min. The strong affinity between Au and Cr species resulted with increasing of Cr (VI) signal, compared with the bare glassy carbon electrode. The electrodepositing time, type of supporting electrolyte, pH, the scan rate, modulation amplitude, and modulation time were optimized using differential pulse anodic stripping voltammetry (DP-ASV). The calibration graph using accumulation time of 120 s was linear from 10 to 120 µgL-1 with a sensitivity 1.3 x 10-2 µA/µgL-1. Under optimum experimental conditions, a good correlation coefficient R2=0.9971, and a low detection limit 5.5 µg/L Cr (VI) was obtained. The signal was reproducible with a relative standard deviation ±4.5 %. The developed Aufilm/GCE sensor was applied for the Cr (VI) determination of in sewage water samples.

Subject Areas

Chromium (VI); thin gold film; glassy carbon electrode and differential pulse anodic stripping voltammetry

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