Table 6 Sources and carcinogenic potential of PAH residues in the water and sediment media in Ilase and Ibasa creeks, Snake Island, Lagos
EPA limit for carcinogenic PAH, 4 to 60 ng/g Pyrogenic source < 1.0 Petrogenic source > 1.0 | Ilase creek | Ibasa creek | ||
|---|---|---|---|---|
Water medium | Sediment | Water medium | Sediment | |
Sum of carcinogenic PAH (ng/g)—B(a)PYR, IN(cd)PYR, Di(ah)ANT | 0.48 | 10.61 | 0.98 | 9.20 |
 PHE/ANT | 1.22 | 0.23 | 0.24 | 0.28 |
 FL/PYR | 0.60 | 0.05 | 0.16 | 0.07 |
 ACE/FLU | 0.12 | 0.15 | 0.04 | 0.05 |
Sum 2–3 rings/sum of 4–6 rings | 0.64 | 1.70 | 22.31 | 1.16 |