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Int. J. Mol. Sci. 2016, 17(9), 1392; doi:10.3390/ijms17091392

Enhancing Signal Output and Avoiding BOD/Toxicity Combined Shock Interference by Operating a Microbial Fuel Cell Sensor with an Optimized Background Concentration of Organic Matter

State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment, Tsinghua University, Beijing 100084, China
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Academic Editors: Deepak Pant and Guido R. M. M. Haenen
Received: 4 July 2016 / Revised: 6 July 2016 / Accepted: 18 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Bioelectrochemical Systems)
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Abstract

In the monitoring of pollutants in an aquatic environment, it is important to preserve water quality safety. Among the available analysis methods, the microbial fuel cell (MFC) sensor has recently been used as a sustainable and on-line electrochemical microbial biosensor for biochemical oxygen demand (BOD) and toxicity, respectively. However, the effect of the background organic matter concentration on toxicity monitoring when using an MFC sensor is not clear and there is no effective strategy available to avoid the signal interference by the combined shock of BOD and toxicity. Thus, the signal interference by the combined shock of BOD and toxicity was systematically studied in this experiment. The background organic matter concentration was optimized in this study and it should be fixed at a high level of oversaturation for maximizing the signal output when the current change (ΔI) is selected to correlate with the concentration of a toxic agent. When the inhibition ratio (IR) is selected, on the other hand, it should be fixed as low as possible near the detection limit for maximizing the signal output. At least two MFC sensors operated with high and low organic matter concentrations and a response chart generated from pre-experiment data were both required to make qualitative distinctions of the four types of combined shock caused by a sudden change in BOD and toxicity. View Full-Text
Keywords: biosensor; microbial fuel cell; toxicity; signal interference biosensor; microbial fuel cell; toxicity; signal interference
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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    Description: The following are available online at www.mdpi.com/link, Figure S1: Schematic of the two chamber MFC sensor for toxicity monitoring, Table S1: The effect of organic matter concentration on the toxic effect.

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MDPI and ACS Style

Jiang, Y.; Liang, P.; Liu, P.; Bian, Y.; Miao, B.; Sun, X.; Zhang, H.; Huang, X. Enhancing Signal Output and Avoiding BOD/Toxicity Combined Shock Interference by Operating a Microbial Fuel Cell Sensor with an Optimized Background Concentration of Organic Matter. Int. J. Mol. Sci. 2016, 17, 1392.

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