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

Table 2

Concentration (mg⋅mL⁻¹) of Pb, Fe, Cu and Zn in the leachate after the assay. Data: average ± standard deviation, 𝑛=3.

Column	Pb	Fe	Cu	Zn
𝑡𝑤	—	0.38±0.01	0.17	0.10±0.01
𝑡𝑑	—	1.93±0.02	0.17	0.12±0.01