Journal
BIOSENSORS & BIOELECTRONICS
Volume 43, Issue -, Pages 264-267Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2012.12.029
Keywords
Bioelectrochemical systems (BESs); Microbial fuel cells (MFCs); Shewanella; Toxicity biosensor; Concentration response
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Funding
- National Natural Science Foundation of China [21107053, 21037002]
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Bioelectrochemical systems (BESs) provide an opportunity to detect biological toxicity of water samples. However, the concentration responses of toxins had not been investigated in detail. Using formaldehyde as a toxic substance, the current responses were analyzed over a concentration range from 0.01% to 0.10% in a single chambered BES with 0 mV (versus saturated calomel electrode) applied on the anode. The decay percentages of currents increased in proportion with the concentration of formaldehyde after 10000 s (similar to 2.8 h), with the peak R-2 of 0.9361 observed at 35,000 s (similar to 9.7 h). Fitting results of exponential decay equation showed that the magnification factor (a) closely related with baseline currents and the toxicity factor (b) was in direct proportion to formaldehyde concentration (from 0% to 0.08%) except over the high concentration of 0.10%. These results provide preliminary information about toxin concentration responses in BESs. (c) 2012 Elsevier B.V. All rights reserved.
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