Chemometrics, Health Risk Assessment and Probable Sources of Total Petroleum Hydrocarbons in Atmospheric Rainwater in Rivers State, Nigeria.

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Abstract Total petroleum hydrocarbons (TPHs)-(aliphatic and aromatic) were analysed for in atmospheric rainwater between April- June; July – August; September–October depicting early, mid, late rain of 2019. Sampling at Rumuodomaya/ Rumuodome and Ogale in Rivers State using basins fastened to a table 2 M above ground and 120 M from high features, Rainwater was analysed after treatment using Agilent GC-FID. Results show cumulative TPHs at R/R were 56.6551mg/L, 39.5201mg/L and 7.2283mg/L, Ogale: 9.1217mg/L, 59.4923mg/L and 21.9825mg/L. Aliphatic hydrocarbons: C5 – C8 were < 1, low contamination, other carbon aggregates (C9 – C16, C17– C35, and C36 – C40) indicate high contamination. Chemometric assessment showed high contamination. TPHs aggregates at Rumuodomaya/ Rumuodome were- C8 – C11 (1.034 and 1.005) early rain, C18 – C25 and C26 – C33 has Carbon preference index of 1.287 and 1.630 (mid-rain), C26 – C33 has CPI of 1.288 (late-rain), Ogale area, C26–C33 has CPI of 1.732 (early-rain), mid-rain C8 – C11 (2.768) and C12–C17 (5.368). Pristane/phytane ratio indicated biogenic and pyrogenic sources. Average carbon length of TPHs for odd n-alkanes were C9 – C11 (9.446) and C35 – C39 (38.980), C9 – C11(10.238), C35 – C39 (36.510); C9 – C11 (10.240) and C35 – C39 (36.934). Average daily intake depicted possible health issues for children and adults as hazard index > 1 for aromatics.

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