Assessment of Mutagenicity and Carcinogenicity Risks and Source Apportionment of Polycyclic Aromatic Hydrocarbons of Monitored Black Carbon (Soot) in Air and Swimming Pool Water in Port Harcourt

Résumé

Abstract Mutagenicity and carcinogenicity of polycyclic aromatic hydrocarbons (PAHs) of monitored soot in air and water in Port Harcourt swimming pool environment were assessed due to incessant downpour of soot in the area. Samples of soot were collected each for six hours in wet and dry seasons. Samples of water were also collected in the two seasons. PAH samples were analyzed using gas chromatography (GC) to generate data which were described using descriptive statistics. In wet season, the total PAHs concentration in the air is 4.603E-03 ppm and in water 7.782E-03 mg/l while in the dry season, it’s 3.636E-03 ppm in the air and 5.172E-03 mg/l in water. The PAH distribution patterns in water followed the same trend in air in wet and in dry seasons with the diagnostic ratios indicating similar source thus suggesting that the major source of PAHs in water is atmospheric deposition from the air. Also, HMW-PAHs dominated each profile with air and water in the study area act as secondary sources for LMW-PAHs in the wet season and water acts as a sink for HMW-PAHs in both the wet and dry seasons. The results of mutagenic equivalent (MEQ) of the study ranged between 5.01E-04 ppm (mg/l) and 1.82E-03mg/l (ppm) while that of toxic equivalent (TEQ) ranged between 1.88E-04ppm (mg/l) and 3.71E-03mg/l ppm. The highest contributions to the MEQ and TEQ and their respective potentials (MP and CP) which is the capacity to cause modifications in human’s DNA thus forming PAH-DNA adduct thereby resulting in mutations and cancer were made in the wet season by IcdP contributing 64% MP and 60 % CP and those of dry season were made by DahA contributing 61% MP and 90% CP. These dominant PAH compounds ie IcdP, DahA, BghiP, BbF, BaP, etc with diagnostic ratios indicated artisanal refineries and other minor contributory sources. Due to the effect of soot toxicants, individuals are to limit exposure while Governments need to take strict measures to reduce the activities of artisanal refineries.

Citer ce document

Accès au document

Texte intégral en lecture en ligne, réservé aux abonnés SPHAERO et aux membres de l'institution. Se connecter

Auteur(s)

Statistiques

Consultations : 1

Téléchargements : 0