Chemical properties | Un-treated CFA | Treated CFA |
pH H2O | 9.5 | 12.2 |
Organic Carbon (%) | 0.49 | 0.24 |
Nitrogen (%) | 0.02 | 0.01 |
P2O5 HCl 25% (%) | 0.53 | 0.11 |
K2O HCl 25% (%) | 0.1 | 0.12 |
MgO HCl 25% (%) | 1.96 | 0.64 |
CaO 25% (%) | 4.82 | 1.35 |
Sulphur (%) | 0.1 | 0.28 |
SiO2 (%) | 31.4 | 10.9 |
H4SiO4 (%) | 0.008 | 2.50 |
Al2O3 (%) | 28.16 | 8.6 |
Fe2O3 (%) | 20.91 | 4.4 |
Pb (ppm) | 17.1 | 20.4 |
Cd (ppm) | 10.5 | 0.9 |
As (ppm) | n.d.* | n.d. |
Hg (ppm) | n.d. | n.d. |
Cr (ppm) | 326.8 | n.d. |
Ni (ppm) | 40.0 | 15.3 |