The electrochemical determination of formaldehyde in aqueous media using nickel modified electrodes

Trivedi, Dhruv and Crosse, John and Tanti, Jonathon and Cass, Alise J. and Toghill, Kathryn E. (2018) The electrochemical determination of formaldehyde in aqueous media using nickel modified electrodes. Sensors and Actuators B: Chemical, 270. pp. 298-303. ISSN 0925-4005

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Abstract

Abstract Glassy carbon (GC) electrodes were modified with nickel metal via a simple deposition procedure, followed by enrichment of the nickel in a potassium hydroxide solution to deliver the catalytic nickel hydroxide species (Ni(OH)2). In solutions of 1 M KOH, the nickel modified GC electrode (Ni-GC) contained a reproducible detection limit of the order of 1.1 × 10−5 M for formaldehyde additions. This is comparable and, in many cases, surpasses, platinum group metal modified electrodes. The potentiometric analytical method also allowed for the accurate determination of “unknown” formaldehyde concentrations, over a linear range of 1 × 10−5–1 × 10−3 M and a sensitivity of 22.7± 3.8 μA/mM. Furthermore, the Ni-GC electrode showed negligible response to formate and methanol, even when they were present in concentrations 10 times greater than the formaldehyde. The electrochemical performance was compared to a simple colorimetric approach to formaldehyde determination, wherein a detection limit of 6 × 10−6 M was obtained.

Item Type:
Journal Article
Journal or Publication Title:
Sensors and Actuators B: Chemical
Additional Information:
This is the author’s version of a work that was accepted for publication in Sensors and Actuators B: Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators B: Chemical, 270, 2018 DOI: 10.1016/j.snb.2018.05.035
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
125616
Deposited By:
Deposited On:
03 Jul 2018 09:14
Refereed?:
Yes
Published?:
Published
Last Modified:
20 Sep 2020 04:50