Electrode specific information from voltammetric monitoring of biogas production

A sensor employing pulse voltammetry monitored the liquid phase of a biogas reactor during 32 days of gas production. An electrode array consisting of stainless steel, platinum and rhodium electrodes generated current responses for a sequence of voltage pulses. Plots of individual current responses...

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Bibliographic Details
Published in:Talanta (Oxford) 2010-06, Vol.81 (4), p.1578-1584
Main Authors: Bjorklund, Robert B., Christiansson, Anneli, Ek, Anders E.W., Ejlertsson, Jörgen
Format: Article
Language:English
Subjects:
Analytical chemistry
Biofuels
Biogas production
Chemistry
Electrochemical methods
Electrochemistry - methods
Electrode array
Electrodes
Equipment Design
Exact sciences and technology
General, instrumentation
Hydrogen-Ion Concentration
Multivariate Analysis
Oscillometry
Oxidation-Reduction
Platinum - chemistry
Principal Component Analysis
Rhodium - chemistry
Stainless Steel - chemistry
TECHNOLOGY
TEKNIKVETENSKAP
Time Factors
Voltammetry
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Summary:A sensor employing pulse voltammetry monitored the liquid phase of a biogas reactor during 32 days of gas production. An electrode array consisting of stainless steel, platinum and rhodium electrodes generated current responses for a sequence of voltage pulses. Plots of individual current responses against time indicated the electrochemical changes occurring in the broth from the perspective of each electrode. The responses from stainless steel had a pronounced diurnal oscillation which followed the daily introduction and consumption of substrate. The current responses for platinum were in a narrow range whereas those for rhodium exhibited several minima. A disturbance in the reactor caused by omission of substrate led to decreases in both gas production and current responses for all the electrodes. Multivariate data evaluation of all the current responses by principal component analysis indicated the daily fluctuations for concentrations of ions and redox active compounds in the broth.
ISSN:0039-9140
1873-3573
1873-3573
DOI:10.1016/j.talanta.2010.03.005