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Relationship between Cr(VI) concentration and voltage output of the MFC biosensor: (A) Cr(VI) concentration: 0.0125 to 0.3 mg/L; (B) Cr(VI) concentration: 0.3 to 5 mg/L (operational temperature: 35 °C, resistance of external circuit: 270 Ω, anolyte: 1/1000 LB supplemented with different Cr(VI) concentration, catholyte: 50 mM phosphate and 25 mM NaCl, response time: 45 min).
