title: [In-situ determination of endogenous decay rate of heterotrophic biofilm by microelectrodes].
abstract: A separated oxygen microelectrode was constructed, based on the improved structure, to determine the oxygen distribution in biofilm at an endogenous state. Based on the diffusion-reaction model, the endogenous decay rate was evaluated by curve-fitting with the measured oxygen profiles. The results showed that the fluctuation range of output signal of oxygen microelectrode was reduced from (1.64 +/- 0.25) nA to (1.53 +/- 0.06) nA, the signal became stable with the fluctuation rejection ratio of 19.41 dB after the structural optimization. The endogenous respiration rate and the endogenous decay rate of heterotrophic biofilm were evaluated to be 2.979 mg x h(-1) and 0.0059 h(-1).
authors.affiliation: State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Yu-Qin
authors.initials: YQ
authors.lastname: Qiu
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Zhou
authors.forename: Han-Chang
authors.initials: HC
authors.lastname: Shi
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D018441:Biofilms; D019149:Bioreactors / Q000382:microbiology*; D019069:Cell Respiration; D008839:Microelectrodes; D010100:Oxygen / Q000032:analysis*
chemical_list: D010100:Oxygen