Research Article
Phytoremediation of Gold Mine Tailings Amended with Iron-Coated and Uncoated Rice Husk Ash by Vetiver Grass (Vetiveria zizanioides (Linn.) Nash)
Table 1
The operating conditions for the microwave digestion system.
| | Samples | Reagents (mL) | Steps program | Power (watt) | Time (min) | Temperature (°C) |
| | Tailings | | | 0.5 g | 65% HNO3 (6 mL)
37% HCl (2 mL)
40% HF (2 mL) | 1
2
3
4 | 200
400
600
0 | 8
7
1
10 | 150
180
200
200 | | Vetiver grass | | | 0.25 g | 65% HNO3 (6 mL)
30% H2O2 (2 mL) | 1
2
3
4 | 250
500
750
0 | 5
10
5
15 | 100
150
200
200 |
|
|
