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

Table 3

The selected physicochemical properties of the RHA and Fe-RHA.

Parameters	RHA	Fe-RHA
pH	10.33 ± 0.33	7.24 ± 0.06
EC (dS m^−1)	0.56 ± 0.04	208.33 ± 0.01
CEC (cmol(+) kg^−1)	13.36 ± 0.37	11.32 ± 0.05
Total C (%)	6.44 ± 0.09	5.45 ± 0.07
DOC mg kg^−1	818.77 ± 2.43	800.8 ± 1.41
Total N (%)	0.047 ± 0.001	0.11 ± 0.01
Total S (%)	ND	ND
Total P (%)	0.23 ± 0.02	0.15 ± 0.01
Total K (%)	0.098 ± 0.003	0.03 ± 0.001
Ash content (%)	8.4 ± 0.23	6.8 ± 0.03
Total Mg (mg kg^−1)	7800 ± 17.61	2600 ± 17.62
Total Ca (mg kg^−1)	585 ± 6.03	ND
Total Na (mg kg^−1)	740 ± 4.58	8100 ± 25.63
Total surface area (m^2 g^1)	24.252	44.686
Pore surface area (m^2 g^−1)	4.417	5.648
Pore volume (cm^3 g^−1)	0.016	0.017
Pore radius (Å)	17.165	19.201

Mean of three replicates ± SD; ND: not detected.