Abstract

Polycyclic aromatic hydrocarbon (PAH) and polychlorinated biphenyl (PCB) congeners in groundwater samples from selected fuel stations in Ado-Ekiti, Southwestern Nigeria, were analyzed to investigate the impact of increased anthropogenic activities. Qualitative and quantitative evaluations of the PAHs and PCBs were done using gas chromatography coupled with appropriate detectors. The PAHs concentrations ranged from ND − 0.98 mg/L, while the PCBs ranged from ND − 164 µg/L. The study reflected that NNPC sampling point had the least contaminated with PCBs, whereas 5Os evinced the highest. The concentrations of the high molecular weight PAHs were generally high compared to low molecular weight PAHs. Using specific ratio distribution, PAH fingerprints suggest pyrogenic origin. Further statistical analysis revealed that 69.0% of the PCBs congeners showed significant difference among the sampling sites with RIHD and 5Os contributing values responsible for the significant levels, while Chi-square revealed no significant difference in the PAHs levels.

摘要

分析了尼日利亚西南部 Ado-Ekiti 选定加油站地下水样品中的多环芳烃 (PAH) 和多氯联苯 (PCB) 同系物，以调查人类活动增加的影响。多环芳烃和多氯联苯的定性和定量评估是使用气相色谱法和适当的检测器进行的。PAHs 浓度范围为 ND - 0.98 mg/L，而 PCBs 范围为 ND - 164 µg/L。研究表明，NNPC 采样点的 PCBs 污染最少，而 5Os 的污染程度最高。与低分子量 PAHs 相比，高分子量 PAHs 的浓度通常较高。使用特定的比率分布，PAH 指纹表明热源。进一步的统计分析显示，69.