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

Table 1

Certain physical and chemical characteristics of the strata E1 to E6.

Stratum	E1	E2	E3	E4	E5	E6
Depth (cm)	4.50	3.50	3.50	14.00	1.00	55.00
Color (dry)	Light brown	Light brown	Light brown	Light brown	Light grey	Brown
Sand (%)	77	53	66	21	56	92
Silt (%)	15	38	27	71	42	6
Clays (%)	8	9	7	8	2	2
Texture	Sandy loam	Loam	Sandy loam	Silt loam	Sandy loam	Sand
Moisture (%)	0.51	0.27	0.18	0.19	0.66	0.03
Conductivity (mS/cm)	0.48	1.57	1.66	1.92	2.0	1.9
pH	8.17	7.77	7.86	7.98	7.98	7.84
Carbonates (%)	17.10	15.00	17.10	16.50	15.50	16.90
ANP (meq CO3^2−/ton)	104.80	71.30	102.70	90.00	178.10	173.30
Organic matter (%)	0.09	0.11	0.13	0.16	0.12	0.14

ANP: acid-neutralization potential.