title: Monitoring of bio-oxidation process of ferrous ion by using piezoelectric impedance analysis.
abstract: A new method of monitoring the bio-oxidation process of ferrous ion in the presence of Thiobacillus ferroxidans was proposed by piezoelectric impedance analysis. The time courses of the responses of impedance parameters for a quartz crystal in a culture system were simultaneously obtained and discussed. It was found that the frequency shift response originates mainly from the adsorption of bacterial metabolites on the surface of gold electrode. Experiments also examined the effect of culture temperature on the bio-oxidation process. Combined with the growth situation of the bacterium, an impedance response model reflecting the process was established. By fitting Delta f vs. time curves toward the proposed model, we obtained and discussed the bacterial growth parameters. The results showed that the proposed method could provide real time and multidimensional information to monitoring of the bio-oxidation process.
authors.affiliation: College of Chemistry and Chemical Engineering, Human University, Hunan, Changsha 410082, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: W
authors.initials: W
authors.lastname: Wei
authors.forename: Y
authors.initials: Y
authors.lastname: Mao
authors.forename: L
authors.initials: L
authors.lastname: Chai
mesh_terms: D013856:Acidithiobacillus thiooxidans / Q000254:growth & development / Q000378:metabolism*; D017097:Electric Impedance; D005296:Ferrous Compounds / Q000378:metabolism*; D010084:Oxidation-Reduction; D013053:Spectrophotometry; D013696:Temperature
chemical_list: D005296:Ferrous Compounds; C020748:ferrous sulfate