Environmental Chemistry Division, CSIR Water Research Institute, P. O. Box AH 38, Achimota, Ghana.
Environ Monit Assess. 2011 Mar;174(1-4):471-80. doi: 10.1007/s10661-010-1471-y. Epub 2010 May 12.
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.
加纳登苏河流域 16 种多环芳烃（PAHs）的浓度采用气相色谱法进行了测量。在登苏流域，从九个站点采集了地表水样本，分别是波塔罗塞、科福里杜亚进水口、苏海因、曼戈阿塞、阿苏博伊、纳萨瓦姆桥、阿富曼、阿沙拉加和威贾进水口。登苏河的总多环芳烃浓度从 13.0 到 80.0μg/mL 不等，平均值为 37.1μg/mL。双环和三环多环芳烃（低分子量多环芳烃）在登苏河流域占主导地位。总多环芳烃浓度表现出以下模式：科福里杜亚进水口（80.0μg/mL）>阿苏博伊（50.8μg/mL）>阿富曼（47.9μg/mL）>威贾进水口（45.0μg/mL）>苏海因（27.6μg/mL）>纳萨瓦姆（23.5μg/mL）>阿沙拉加（22.9μg/mL）>波塔罗塞（23.3μg/mL）>曼戈阿塞（13.0μg/mL）。根据美国毒物和疾病登记署（ATSDR）的数据，美国饮用水中多环芳烃的背景水平在 0.004 到 0.024μg/mL 之间。所有地点的多环芳烃含量都超过了 ATSDR 设定的范围。苯并[a]芘的致癌暴露等效值最高（0.3μg/mL），其次是苯并[a]蒽（0.132μg/mL）和苯并[b]荧蒽（0.08μg/mL），分别占登苏河流域地表水多环芳烃总致癌性的 52.6%、23.2%和 4.6%。致癌潜力估计为 0.57μg/mL。多环芳烃的存在表明水源受到污染，可能对健康产生影响。
