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Title: Tricky Cyclic Voltammetry Peaks in Glycerol Anaerobic Fermentation: microbial excreted organics or others?
Authors: Pan, Chaozhi
Ge, Liya
Chen, Chia-Lung
Wang, Jing-Yuan
Keywords: DRNTU::Engineering::Environmental engineering::Water treatment
Cyclic voltammetry
redox active substance
ferrous phosphate
anaerobic fermentation
Issue Date: 2016
Source: Pan, C., Ge, L., Chen, C.-L., & Wang, J.-Y. (2016). Tricky cyclic voltammetry peaks in glycerol anaerobic fermentation: Microbial excreted organics or others? Journal of Electroanalytical Chemistry, 771, 23-28.
Series/Report no.: Journal of Electroanalytical Chemistry
Abstract: Cyclic voltammetry (CV) is a widely used and powerful technique for detection and investigation of redox active substances. However, the interpretation of cyclic voltammograms is challenging as redox peaks could be attributed to metabolites and inorganic compounds. In this study, a CV redox peak pair was observed in the anaerobic fermentation broth of glycerol and the amplitude of the peak current increased as fermentation proceeded. Moreover, the central potential of the redox pair shifted towards a more positive potential as pH decreased. Iron was found responsible for the observed redox peaks and its precipitation led to the disappearance of redox peaks. The proposed electrode and precipitation reactions were supported by the simulation of ferrous sulfate in a phosphate buffer solution. This study provided an example that an inorganic compound, instead of microbial excreted organics, resulted in redox peaks in the cyclic voltammograms of glycerol fermentation. Moreover, the results also highlighted that acidic pH enhanced the bio-availability of trace minerals in anaerobic fermentation.
ISSN: 1572-6657
DOI: 10.1016/j.jelechem.2016.03.044
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Residues and Resource Reclamation Centre 
Rights: © 2016 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Electroanalytical Chemistry, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
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