Phytoremediation of Gold Mine Tailings Amended with Iron-Coated and Uncoated Rice Husk Ash by Vetiver Grass (Vetiveria zizanioides (Linn.) Nash)

Table 4

The pH (1 : 2.5 /), EC (µS cm⁻¹), and CEC (cmol₍₊₎ kg⁻¹) of the mine tailings amended with the ashes (mean , ±SD). Different letters correspond to significant differences between rates of the same ash ( < 0.05) in the same column.

Type	Rates (%)	pH	SD	EC (dS m^−1)	SD	CEC (cmol + kg^−1)	SD	DOC (mg/kg)	SD
Control	0	7.90	0.02	1.48	0.012	11.75	0.83	823.03	5.28
RHA	5	8.45	0.01	1.48	0.015	10.05	1.47	844.86	7.84
RHA	10	8.55	0.00	1.49	0.015	11.75	0.63	904.43	6.59
RHA	20	9.05	0.02	1.58	0.045	12.46	1.46	919.80	10.30
Control	0	7.90	0.02	1.48	0.012	11.75	0.83	823.03	5.28
Fe-RHA	5	7.73	0.03	1.48	0.034	14.12	0.12	772.43	12.41
Fe-RHA	10	7.70	0.04	1.51	0.012	12.48	2.56	815.17	8.57
Fe-RHA	20	7.66	0.06	1.64	0.008	12.25	0.23	835.63	5.54