Growth of Photosynthetic Biofilms and Fe, Pb, Cu, and Zn Speciation in Unsaturated Columns with Calcareous Mine Tailings from Arid Zones

Figure 5

pH, % calcium carbonate (CaCO₃), acid-neutralization potential (ANP, in CO₃²⁻/ton), electric conductivity (EC, in mS/cm), % humidity, and % organic matter of strata E1 to E6 before the assay (𝑡₀; light gray and open squares) and after the wet (𝑡_𝑤; dark gray) and dry (𝑡_𝑑; black) seasons. Data: average, 𝑛=3.

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