Table 2.

Samples tested and concentrations and pH of the solutions used.

No.Dry density (mg/m3)SolutionpH
11.70Distilled water7.0
20.1 mol/L NaOH13.0
30.3 mol/L NaOH13.5
40.6 mol/L NaOH13.8
51.60Distilled water7.0
60.1 mol/L NaOH13.0
70.3 mol/L NaOH13.5
80.6 mol/L NaOH13.8
91.50Distilled water7.0
100.1 mol/L NaOH13.0
110.3 mol/L NaOH13.5
120.6 mol/L NaOH13.8