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Dynamic response of MFC BOD sensors against organic concentration (BOD5) in DWW. (A,B) show a linear relationship between the independent variable (maximum voltage) and dependent variable (BOD5) of the β- and γ-MnO2-type MFC BOD sensors, respectively, after 6 months; (C,D) demonstrate the same type of relationship after 1.5 years. Standard deviations in voltages are indicated in red color.
