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A mediator-type biosensor as a new approach to biochemical oxygen demand estimation
1Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904, Japan.
The Analyst
|February 24, 2001
Summary
A novel biosensor utilizing potassium hexacyanoferrate(III) and Pseudomonas fluorescens offers a rapid and accurate method for determining biochemical oxygen demand (BOD) in wastewater. This innovative sensor provides reliable results comparable to traditional methods.
Area of Science:
- Electrochemistry
- Environmental Science
- Biotechnology
Background:
- Biochemical oxygen demand (BOD) is a critical parameter for assessing water quality.
- Conventional BOD testing methods are time-consuming, often requiring 5 days.
- There is a need for rapid and reliable biosensors for real-time water quality monitoring.
Purpose of the Study:
- To develop and characterize a novel amperometric biosensor for determining biochemical oxygen demand (BOD).
- To utilize potassium hexacyanoferrate(III) as a mediator and Pseudomonas fluorescens immobilized on a disposable electrode.
- To optimize sensor performance and validate its efficacy against conventional methods.
Main Methods:
- Development of a disposable three-electrode system with integrated working and counter electrodes.
- Immobilization of Pseudomonas fluorescens using a poly(vinyl alcohol)-quaternized stilbazol photopolymer gel.
- Optimization of amperometric measurement conditions (potential, mediator concentration, buffer, pH, temperature) and testing with OECD synthetic wastewater.
Main Results:
- The developed BOD biosensor demonstrated a linear response from 15 to 200 mg O l-1.
- Achieved a rapid response time of 15 minutes at 200 mg O l-1 BOD.
- Showcased a wide metabolic activity range and insensitivity to low dissolved oxygen levels.
- Real wastewater samples showed comparable BOD values to the conventional BOD5 method.
Conclusions:
- The novel biosensor provides a sensitive, selective, and rapid alternative for BOD determination.
- The disposable sensor design and optimized conditions enhance its practical applicability in environmental monitoring.
- This technology holds promise for efficient wastewater treatment plant management and water quality assessment.