Electrochemical detection of Cr(VI) and Cr(III) ions present in aqueous solutions using bio-modified carbon paste electrode: a voltammetric study

Prabhakaran, DC and Ramamurthy, PC and Sivry, Y and Subramanian, S (2020) Electrochemical detection of Cr(VI) and Cr(III) ions present in aqueous solutions using bio-modified carbon paste electrode: a voltammetric study. In: International Journal of Environmental Analytical Chemistry .

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Abstract

Chromium is recognised as a potent water pollutant by the WHO and thus it becomes pertinent to continuously monitor chromium levels in the waterbodies. Voltammetry, an electroanalytical technique, has been utilised for the detection of hexavalent (Cr(VI)) and trivalent (Cr(III)) chromium in aqueous samples. Carbon Paste Electrode (CPE) modified using Sphingopyxis macrogoltabida SUK2c, an indigenous bacterial strain isolated from the water samples collected from Sukinda Valley, Odisha, India, was used as a working electrode in a typical three-electrode electrochemical cell. The developed biosensors were found to provide about 3.5 fold increase in cathodic peak current compared to the bare CPE for Cr(VI) ions. Using cyclic voltammetry (CV), the Lowest Limit of Detection (LLOD) of 1 � 10�4 M and 1 � 10�2 M for Cr(VI) and Cr(III) ions, respectively, were achieved with the biosensors. The LLOD was further improved to 1 � 10�9 M and 1 � 10�7 M for Cr(VI) and Cr(III) ions, respectively, adopting differential pulse cathodic stripping Vvoltammetry (DPCSV) technique employing the biosensors. The concentrations of Cr(VI) and Cr(III) ions present in water samples collected from Sukinda Valley, Odisha, India, could be determined using the biosensor. The plausible mechanisms involved in the detection of Cr(VI) and Cr(III) ions by the developed electrochemical biosensor are discussed. © 2020, © 2020 Informa UK Limited, trading as Taylor & Francis Group.

Item Type:	Journal Article
Publication:	International Journal of Environmental Analytical Chemistry
Publisher:	Taylor and Francis Ltd.
Additional Information:	Copyright of this article belongs to Taylor and Francis Ltd.
Keywords:	Biosensors; Carbon; Chemical detection; Cyclic voltammetry; Electrochemical electrodes; Ions; Water pollution, Carbon paste electrode; Differential pulse cathodic stripping; Electroanalytical techniques; Electrochemical biosensor; ELectrochemical detection; Modified carbon paste electrode; Sphingopyxis macrogoltabida; Voltammetric studies, Chromium compounds
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	08 Apr 2021 10:51
Last Modified:	08 Apr 2021 10:51
URI:	http://eprints.iisc.ac.in/id/eprint/65378

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