Table 1. Characteristics of AMD and Synthetic AMD (SAMD).

characteristic	AMDa	SAMDb
pH	3.0 ± 0.1	3.5 ± 0.2
iron (Fe)	208.0 ± 9.95	1 ± 0.02
manganese (Mn)	14.48 ± 0.16	20 ± 0.1
copper (Cu)	0.052 ± 0.002	0.5 ± 0.02
zinc (Zn)	0.0151 ± 0.004	0.5 ± 0.01
cadmium (Cd)	0.005 ± 0	0.5 ± 0.1
nitrate (NO3–)	129.65 ± 0.61	90 ± 1.5
total phosphate (PO43–)	6.77 ± 1.07	3.3 ± 0.2

^an = 5.

^bn = 3. The concentrations are in mg L^–1.