Horta, Daniela G. [UNESP]Bevilaqua, Denise [UNESP]Acciaric, Heloisa A. [UNESP]Garcia Jr., Oswaldo [UNESP]Benedettie, Assis V. [UNESP]2014-05-202014-05-202007-01-01Biohydrometallury: From the Single Cell To the Environment. Stafa-zurich: Trans Tech Publications Ltd, v. 20-21, p. 83-86, 2007.1022-6680http://hdl.handle.net/11449/31779The electrochemical response of chalcopyrite was studied using electrochemical noise analysis (ENA). The assay was carried out under constant aeration using 30 mL in two electrochemical cells containing iron-free mineral salts solution. These cells were initially monitored for 56 hours, After 72 hours, 7.25x 10(10) cells mL(-1) of A, ferrooxidans strain LR were added in both cells and monitored until 128 h. Subsequent to this period, 0.927 mmol L-1 of silver ions and 400 mmol L-1 of chloride ions were added each one separately. Both conditions were monitored until 168 hours. According to results obtained, it was observed that Cl- ions addition induced an accelerated corrosion process. However, there is a tendency of the system to reach the stationary state due to repassivation of the electrodic surface. In the other side, the Ag+ addition contributed for the maintenance of the oxidant atmosphere, in spite of controversial effect caused by considerable variations in the R-n values, resulting in a instability in the chalcopyrite reactivity.83-86engchalcopyriteAcidithiobacillus ferrooxidanscarbon paste electrodeselectrochemical noise analysisbioleachingTrabalho apresentado em evento10.4028/www.scientific.net/AMR.20-21.83WOS:000250578900018Acesso aberto2-s2.0-72449173248