Parameter Value
pH (water) 6.2 ± 0.20
pH (KCl) 5.40 ± 0.15
Percent carbon (%) 7.43 ± 0.07
Total nitrogen (%) 0.07 ± 0.05
Total C/N ratio 106:01:00
Total nitrate (%) 4.6 ± 0.05
Ca2+ (Meq./100g) 2.0 ± 0.08
Mg2+ (Meq./100g) 0.6 ± 0.07
Na+ (Meq./100g) 0.32 ± 0.06
K+ (Meq./100g) 0.13 ± 0.05
CEC (Meq./100g) 2.43 ± 0.06
H+ (Meq./100g) 2.60 ± 0.05
Al3+ (Meq./100g) BDL
Available Phosphorus (ppm) 21.4 ± 0.93
Microbial respiration (mgCO2 evolved) 129.7 ± 2.62
TPH (mg/kg) 15056.86 ± 92.11
PAHs (ppm) 2462.88 ± 30.61
BDL=below detection limit
Table 1: The chemical properties of crude oil contaminated soil.