title: Concentration responses of toxicity sensor with Shewanella oneidensis MR-1 growing in bioelectrochemical systems.
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.
authors: MOE Key Laboratory of Pollution Processes and Environmental Criteria/ Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, No. 94 Weijin Road, Nankai District, Tianjin 300071, China. wangxin5601@yahoo.com.cn
authors: Xin
authors: X
authors: Wang
authors: Ningshengjie
authors: N
authors: Gao
authors: Qixing
authors: Q
authors: Zhou
mesh_terms: D001681:Biological Assay / Q000295:instrumentation*; D015374:Biosensing Techniques / Q000295:instrumentation*; D002470:Cell Survival / Q000187:drug effects; D003217:Conductometry / Q000295:instrumentation*; D004305:Dose-Response Relationship, Drug; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007928:Lethal Dose 50; D020592:Shewanella / Q000187:drug effects* / Q000502:physiology*; D018675:Toxicity Tests / Q000295:instrumentation*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical