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Guey-Horng Wang, Chiu-Yu Cheng, Man-Hai Liu, Tzu-Yu Chen +2
This study demonstrates a microbial fuel cell (MFC)-based biosensor using Ochrobactrum anthropi YC152, a facultatively anaerobic, Cr(VI)-reducing exoelectrogen, for rapid hexavalent chromium detection in water. The MFC voltage decreases proportionally with Cr(VI) concentration, enabling quantitative measurement across two linear ranges (0.0125–0.3 mg/L and 0.3–5 mg/L) with <10% deviation in 45 minutes. The biosensor exhibits stable performance under varying pH, temperature, salinity, and water quality conditions, positioning it as a practical early warning device for environmental monitoring and regulatory compliance.
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Fast hexavalent chromium (Cr(VI)) determination is important for environmental risk and health-related considerations. We used a microbial fuel cell-based biosensor inoculated with a facultatively anaerobic, Cr(VI)-reducing, and exoelectrogenic Ochrobactrum anthropi YC152 to determine the Cr(VI) concentration in water. The results indicated that O. anthropi YC152 exhibited high adaptability to pH, temperature, salinity, and water quality under anaerobic conditions. The stable performance of the microbial fuel cell (MFC)-based biosensor indicated its potential as a reliable biosensor system. The MFC voltage decreased as the Cr(VI) concentration in the MFC increased. Two satisfactory linear relationships were observed between the Cr(VI) concentration and voltage output for various Cr(VI) concentration ranges (0.0125–0.3 mg/L and 0.3–5 mg/L). The MFC biosensor is a simple device that can accurately measure Cr(VI) concentrations in drinking water, groundwater, and electroplating wastewater in 45 min with low deviations (<10%). The use of the biosensor can help in preventing the violation of effluent regulations and the maximum allowable concentration of Cr(VI) in water. Thus, the developed MFC biosensor has potential as an early warning detection device for Cr(VI) determination even if O. anthropi YC152 is a possible opportunistic pathogen.