735 Figure 50- A. niger tolerance across the bauxite residue samples: (A) BR-A and BR-B, and (B) BR-C. The red dashed line indicates a tolerance index of 0.5. Asterisks (*) indicate statistically significant differences. Figure 51- pH variation of the culture medium after 11 days of incubation with A.niger under different bauxite residues and concentrations. Values are expressed as ΔpH (1õ3)$5H - 1õ)$)>)5H). Negative ΔpH values represent a reduction in pH (acidification) relative to the initial medium. Means and confidence intervals (95%) are presented. A) B) A) B)
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