BIORECEPTOR ELEMENT BASED ON ESCHERICHIA COLI BACTERIA AND FERROCENE MEDIATOR FOR SURFACE WATERS TOXICITY DETERMINATION
In the course of the work, the characteristics of the bioreceptor element based on Escherichia coli bacteria and the ferrocene mediator were studied. Phenol and copper (II) ions were chosen as reference toxicants. The kinetics of glucose oxidation by bacteria in the presence of these toxicants was studied. It was found that the inhibition is reversible and corresponding to mixed type. The long-term stability of the bioreceptor element was 3 days, the operational stability was 6.92%, the reproducibility of the analytical signal of a series of electrodes was 7%. The resulting bioreceptor element was tested on surface water samples, Toxicity assessment by the biosensor method correlated with the results of the reference biotesting method, in which Chlorella vulgaris algae were used as a test object.