Table 1.

Physico-chemical properties of the crude oil polluted wetland soil

Parameters	Percentage of crude oil pollution
Soil particles	Control	0.5%	1%	5%	10%	15%	20% v/v
(1) Sand (%)	90.20	90.80	91.80	92.40	90.00	89.90	90.00
(2) Silt (%)	3.80	3.00	3.20	3.40	4.00	4.10	4.30
(3) Clay (%)	6.00	6.20	5.00	4.20	6.00	6.00	5.70
pH	6.90	6.50	6.40	6.10	5.80	5.60	4.50
Conductivity μS/cm−1	6.70	6.40	6.30	6.30	6.20	6.10	5.90
Organic matter (%)	0.040	0.070	0.129	0.111	0.158	0.146	0.176
Total nitrogen (%)	0.26	0.25	0.22	0.15	0.14	0.12	0.12
Available phosphorus (mg/kg)	44.99	22.66	15.99	15.33	10.66	10.66	13.99
Total hydrocarbon	0.00	2,300	2,750	3,900	4,950	5,060	5,200
Exchangeable cations (Cmol/kg)
Calcium	2.34	2. 04	1.00	1.20	1. 04	2.60	1.90
Magnesium	1.00	1.00	0.50	0.60	0.60	0.70	0.70
Sodium	0.05	0.06	0.06	0.07	0.06	0.07	0.05
Potassium	0.10	0.10	0.13	0.09	0.06	0.13	0.08
Exchangeable acidity	2.00	2.10	2.00	2.00	2.20	2.40	2.40
ECEC	5.49	5.66	3.69	3.96	4.32	5.90	5.13
BS%	63.57	62.88	45.79	49.49	49.07	59.32	53.22