Ecological risk assessment of the levels of polycyclic aromatic hydrocarbons in soils of the abandoned sections of Orji Mechanic Village, Owerri, Imo State, Nigeria

Bulletin of the National Research Centre

Table 3 PAHs (mg/kg) concentrations associated with the study area

Sample points	Min	Max	Mean	STD	% CV	∑PAHs	∑LPAHs	∑HPAHs	∑Carc-PAHs	∑COMB- PAHs
A	1.05E−03	7.13E−01	5.60E−02	0.01	13.41	6.71E−01	1.13E−01	5.42E−01	5.39E−01	1.74E−01
B	1.06E−03	1.84E−01	2.44E−02	0.00	16.31	2.92E−01	1.01E−01	1.53E−01	1.53E−01	1.13E−01
C	2.56E−04	6.88E−01	4.27E−02	0.02	45.43	5.01E−01	1.60E−01	3.05E−01	3.05E−01	7.80E−02
D	2.52E−04	2.76E−01	2.24E−02	0.01	34.87	2.23E−01	4.20E−02	1.72E−01	1.72E−01	8.38E−02
E	1.73E−04	1.75E−01	1.22E−02	0.00	45.57	1.58E−01	4.18E−02	9.74E−02	9.74E−02	5.21E−02
CN1	7.82E−05	1.39E−01	1.64E−02	0.01	35.61	1.99E−01	7.16E−03	1.81E−02	1.81E−01	1.19E−01
CN2	4.57E−04	4.10E−01	3.86E−02	0.03	88.34	4.41E−01	6.52E−02	3.55E−01	3.55E−01	8.73E−02

where the coefficient of variation (% CV), the sum of all the PAHs determined (∑PAHs), the sum of high molecular weight (4–6 rings) PAHs (∑HPAHs), the sum of low molecular weight (2–3 rings) PAHs (∑LPAHs), the sum of combustible PAHs (∑Comb-PAHs)—(Fla, Pyr, Ban, Chy, BkF, BbF, and Indp), and the sum of carcinogenic PAHs (∑Carc-PAHs)-(Ban, Chy, BkF, BbF, Dbh, and Indp)