Compound
Chemical formula
Percentages presented in soil
Silica
SiO
2
81.2%
Iron
Fe2O
3
2.1%
Aluminum
Al2O
3
6.6%
Calcium
CaO
1.2%
Magnesium
MgO
1.5%
Sodium
Na
2
O
2.0%
Potassium
K
2
O
2.1%
Table 3:
Chemical composition of the sand after the treatments.
