Exploration of operation mode of microbial electrochemical sensor for Cu2+detection in water environment and analysis of microbial colonies
The differences in sensitivity and response time of microbial electrochemical sensors in different operating modes was explored for detecting heavy metal ions.In the operating modes of constant external resistance,open circuit and constant external bias,the voltage suppression rate or current drop of MFC electrochemical sensor was investigated with different concentration of Cu2+.The results showed that when the concentration of Cu2+was 1～10 mg·L-1,the voltage suppression rate or current drop range to the sensor were 46.98％～80.12％,63.15％～89.12％and 1.214 4～3.730 mA,respectively.And the linear correlation coefficients R2 were 0.979 4,0.972 6 and 0.947 6,respectively.The MFC electrochemical sensor in open circuit mode had better detection performance for Cu2+.A theoretical and experimental basis has been provided for real-time monitoring of heavy metal in water by microbial electrochemical sensors.And a foundation for further research on real-time monitoring of various pollutants by microbial electrochemical sensors has been laid.
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