Optimisation of an electrochemical sensor based on bare gold electrode for detection of aluminium ion

Gilbert Ringgit and Shafiquzzaman Siddiquee and Suryani Saallah and Mohammad Tamrin Mohamad Lal (2020) Optimisation of an electrochemical sensor based on bare gold electrode for detection of aluminium ion. Borneo International Journal of Biotechnology (BIJB), 1. 103 -123. ISSN 2716-697X

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Abstract

In this work, an electrochemical method for detection of trace amount of aluminium (Al3+), a heavy metal ion, based on a bare gold electrode (AuE) was developed. Current responses of the AuE under various type of electrolytes, redox indicators, pH, scan rate and accumulation time were investigated using cyclic voltammetry (CV) method to obtain the optimum conditions for Al3+ detection. The sensing properties of the AuE towards the target ion with different concentrations were investigated using differential pulse voltammetry (DPV) method. From the CV results, the optimal conditions for the detection of Al3+ were Tris-HCl buffer (0.1 M, pH 2) supported by 5 mM Prussian blue with scan rate and accumulation time respectively of 100 mVs−1 and 15 s. Under the optimum conditions, the DPV method was detected with different concentrations of aluminium ion ranging from 0.2 to 1.0 ppm resulted in a good linear regression r² = 0.9806. This result suggests that the optimisation of the basic parameters in electrochemical detection using AuE is crucial before further modification of the Au-electrode to improve the sensitivity and selectivity especially for the low concentration of ion detection. The developed method has a great potential for rapid detection of heavy metal ion (Al3+) in drinking water samples.

Item Type:	Article
Keyword:	Electrochemical Sensor , Heavy Metal , Aluminium , Cyclic Voltammetry , Differential Pulse Voltammetry
Subjects:	Q Science > QD Chemistry
Department:	INSTITUTE > Biotechnology Research Institute (BRI)
Depositing User:	NORAINI LABUK -
Date Deposited:	25 Jun 2021 11:19
Last Modified:	25 Jun 2021 11:19
URI:	https://eprints.ums.edu.my/id/eprint/27409

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