Table 1: The chemical composition (%w/w) of the materials used.

Constituents (%)Soil C OE SOT

SiO251.2144.0543.1853.3258.36
Al2O312.5911.5719.3620.1622.17
Fe2O32.668.817.7110.507.09
CaO7.0414.1917.844.402.61
MgO3.314.972.804.502.46
K2O1.701.801.642.982.27
Na2O1.523.590.360.510.71
SO35.5710.342.531.040.34
KK12.001.394.001.653.35
F CaO0.070.140.310.01
Cl0.0085