Variation of the optical absorbance spectra of acidified solutions containing Pu(OH)4(am) in the presence of a cell suspension of S. oneidensis and 0.5 mM of EDTA. T0, a time point of 15 min; T5, a time point of 72 h. Conditions were a cell density of 5 × 108 cells/ml, a pH of 7.0, a lactate concentration of 10 mM, and a Pu(OH)4(am) concentration of 0.50 mM.