title: Levels of polycyclic aromatic hydrocarbons (PAHs) in the Densu River Basin of Ghana.
abstract: The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in Densu River Basin in Ghana were measured using gas chromatograph. Surface water samples were collected from nine stations, namely, Potroase, Koforidua Intake, Suhyien, Mangoase, Asuboi, Nsawam Bridge, Afuaman, Ashalaga, and Weija Intake in the Densu Basin. Total PAH concentrations varied from 13.0 to 80.0 μg/mL in the Densu River, with a mean value of 37.1 μg/mL. The two- to three-ring PAHs (low-molecular-weight PAHs) were found to be dominant in the Densu River Basin. Total PAH concentrations showed the following pattern: Koforidua Intake (80.0 μg/mL) > Asuboi (50.8 μg/mL) > Afuaman (47.9 μg/mL) > Weija Intake (45.0 μg/mL) > Suhyien (27.6 μg/mL) > Nsawam (23.5 μg/mL) > Ashalaja (22.9 μg/mL) > Potroase (23.3 μg/mL) > Mangoase (13.0 μg/mL). According to the Agency for Toxic Substances and Disease Registry (ATSDR), background levels of PAHs in drinking water supplies in the USA range from 0.004 to 0.024 μg/mL. PAH levels from all sites exceeded the range set by ATSDR. B[a]P contributed the highest carcinogenic exposure equivalent (0.3 μg/mL), followed by B[a]A (0.132 μg/mL) and B[b]F (0.08 μg/mL), contributing 52.6%, 23.2%, and 4.6%, respectively, of the total carcinogenicity of surface water PAH in the Densu River Basin. The carcinogenic potency was estimated to be 0.57 μg/mL. The presence of PAHs was an indication of the water sources being contaminated, with potential health implications.
authors.affiliation: Environmental Chemistry Division, CSIR Water Research Institute, P. O. Box AH 38, Achimota, Ghana. jeamoako@yahoo.co.uk
authors.forename: Joyce
authors.initials: J
authors.lastname: Amoako
authors.forename: Osmund D
authors.initials: OD
authors.lastname: Ansa-Asare
authors.forename: Anthony Y
authors.initials: AY
authors.lastname: Karikari
authors.forename: G
authors.initials: G
authors.lastname: Dartey
mesh_terms: D002849:Chromatography, Gas; D005618:Fresh Water / Q000737:chemistry*; D005869:Ghana; D011083:Polycyclic Compounds / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D011083:Polycyclic Compounds; D014874:Water Pollutants, Chemical
references.citation: Sci Total Environ. 2003 Sep 1;313(1-3):61-76
references.pmid: 12922061
references.citation: Environ Pollut. 2002;119(1):91-8
references.pmid: 12125734
references.citation: Anal Chem. 2003 Jan 15;75(2):234-46
references.pmid: 12553757
references.citation: Chemosphere. 2001 Jul;44(2):125-46
references.pmid: 11444294
references.citation: Environ Sci Technol. 2004 Apr 1;38(7):1941-8
references.pmid: 15112792
references.citation: Chemosphere. 2000 Dec;41(12):1845-55
references.pmid: 11061306
references.citation: Environ Health Perspect. 2002 Jun;110 Suppl 3:451-88
references.pmid: 12060843
references.citation: Mutat Res. 2000 Aug 21;469(1):71-82
references.pmid: 10946244
references.citation: J Hazard Mater. 2009 May 30;164(2-3):1379-85
references.pmid: 18980804
references.citation: Chemosphere. 2004 Jan;54(4):443-52
references.pmid: 14581046
references.citation: Anal Chem. 2002 May 15;74(10):2379-85
references.pmid: 12038764