Electrochemical Sensor Detect Typical Trace Organic Pollutants In Water Source

In this study,the electrochemical detection method of large amounts of trace antibiotic contaminants norfloxacin（NOR）and typical trace olfactory substance odorous geosmin（GSM）in water environment is established.At the same time,using molecular structure analysis methods,for the first time revealed the interaction between the target pollutants（ofloxacin,norfloxacin and enoxacin in quinolone antibiotics）and the electrode interface.Clarified the difference in peak potential and peak current of different pollutants due to different molecular structures.The specific research work is as follows:（1）The template molecules and functional monomers mixed in a certain proportion are modified on the electrode surface,and after elution,the indirect method is used to quantitatively detect the concentration of geosmin in water.By optimizing parameters such as scan rate,eluent type,and enrichment time,a new sensor that is easy to prepare and has low detection limit is constructed,which can effectively detect GSM in the actual water environment.The final experimental results show that the optimized sensor performs well,the concentration response range of GSM is 5-200ng/L,and the minimum detection limit is 5 ng/L.This method can be used to quickly detect GSM in the water environment.（2）Electrochemical oxidation etching（ECP）method is used to modify the electrode for detecting norfloxacin（NOR）in water.Improve electrode performance by changing the voltage across the electrode.Optimized the scanning rate,the size of the voltage applied to the two ends of the electrode,and the enrichment time.When the performance of the sensor is optimal,the range is 5×10^-7-1×10^-4 mol L^-1,the detection limit on the ECP/GCE is 1×10^-7 mol L^-1.（3）Based on the detection results of ofloxacin（OFL）,norfloxacin（NOR）,and enoxacin（ENX）based on the glass carbon electrode（GCE）,the molecular structure analysis method based on quantum chemistry was used for the first time.By analyzing the electronegativity of oxidized functional groups of pollutants and the ease of electrocatalysis of non-oxidized functional groups,the mechanism of the influence of molecular structure on peak current and peak potential was clarified.The research results provide support for rapid detection of trace organic pollutants（such as antibiotics）in the water environment based on the molecular structure of the target pollutants and the rapid selection of electrodes with appropriate electrochemical windows.