Figure 2: Schematic representation of pH values under different tested environmental conditions (liquid solutions: A. Phenol + sodium azide, B. Phenol + sodium azide + NaHCO3 (500 mg/ L), C. Phenol + sodium azide + NaHCO3(600 mg/L), D. Phenol + sodium azide + NaHCO3 (600 mg/ L) + FeCl3+ K2HPO4 + NaHCO3+ NH4Cl + CaCl3+ K2SO4, E. Phenol + sodium azide + NaHCO3(600 mg/ L) + FeCl3+ K2HPO4+ NH4Cl + CaCl3+ K2SO4 + control pH (HCl/NaOH))for soil samples T4, T5 and T6.