1. Concentration responses of toxicity sensor with Shewanella oneidensis MR-1 growing in bioelectrochemical systems
- Author
-
Ningshengjie Gao, Xin Wang, and Qixing Zhou
- Subjects
Shewanella ,Conductometry ,Cell Survival ,Biomedical Engineering ,Biophysics ,Analytical chemistry ,Formaldehyde ,Biosensing Techniques ,Median lethal dose ,Lethal Dose 50 ,chemistry.chemical_compound ,Toxicity Tests ,Electrochemistry ,Shewanella oneidensis ,Chromatography ,Dose-Response Relationship, Drug ,biology ,Concentration Response ,Chemistry ,Equipment Design ,General Medicine ,biology.organism_classification ,Equipment Failure Analysis ,Dose–response relationship ,Saturated calomel electrode ,Toxicity ,Biological Assay ,Water Pollutants, Chemical ,Biotechnology - Abstract
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 0mV (versus saturated calomel electrode) applied on the anode. The decay percentages of currents increased in proportion with the concentration of formaldehyde after 10000s (∼2.8h), with the peak R(2) of 0.9361 observed at 35,000s (∼9.7h). 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.
- Published
- 2013
- Full Text
- View/download PDF