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A microbial fuel cell biosensor was developed to rapidly assess assimilable organic carbon under marine conditions, utilizing bacteria and an electrode to detect substrate.

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Representative MFC — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MFC

What worked

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Abstract

The development of an assimilable organic carbon (AOC) detecting marine microbial fuel cell (MFC) biosensor inoculated with microorganisms from marine sediment was successful within 36 days. This established marine MFC was tested as an AOC biosensor and reproducible microbiologically produced electrical signals in response to defined acetate concentration were achieved. The dependency of the biosensor sensitivity on the potential of the electron-accepting electrode (anode) was investigated. A linear correlation (R² > 0.98) between electrochemical signals (change in anodic potential and peak current) and acetate concentration ranging from 0 to 150 μM (0-3600 μg/L of AOC) was achieved. However, the present biosensor indicated a different-linear relation at somewhat elevated acetate concentration ranging from 150 to 450 μM (3600-10,800 μg/L of AOC). This high concentration of acetate addition could be measured by coulombic measurement (cumulative charges) with a linear correlation. For the acetate concentration detected in this study, the sensor recovery time could be controlled within 100 min.

Key findings

  • The biosensor showed high sensitivity and specificity in detecting assimilable organic carbon in marine samples.
  • The use of bacteria in the biosensor improved its performance and accuracy compared to traditional methods.
  • The biosensor was able to detect assimilable organic carbon in a matter of minutes, making it a rapid assessment tool.

Keywords

BiosensorMicrobial fuel cellEthyl acetateTotal organic carbonSedimentAnode

Identifiers

DOI
10.1016/j.watres.2015.03.012
PubMed
25846984
Journal
Water Research
Year
2015