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Distribution, sources and exposure risk of polycyclic aromatic hydrocarbons in soils, and indoor and outdoor dust from Port Harcourt city, Nigeria
Environmental Science: Processes & Impacts ( IF 5.5 ) Pub Date : 2021-07-06 , DOI: 10.1039/d1em00094b
Chinedu J Ossai 1 , Chukwujindu M A Iwegbue 1 , Godswill O Tesi 2 , Chijioke Olisah 3 , Francis E Egobueze 4 , Godwin E Nwajei 1 , Bice S Martincigh 5
Affiliation  

In this study, we evaluated the concentrations, composition, sources, and potential risks of polycyclic aromatic hydrocarbons (PAHs) in soils, and indoor and outdoor dust from Port Harcourt city in Nigeria. Gas chromatography-mass spectrometry (GC-MS) was used for the detection and quantification of PAH species in the samples. The concentrations of the US EPA 16 PAHs plus 2-methyl-naphthalene (∑17 PAHs) in soils, and indoor and outdoor dust from Port Harcourt city ranged from 240 to 38 400, 276 to 9130 and 44 to 13 200 μg kg−1 (dry weight, d.w.) respectively. The PAH concentrations in these matrices followed the sequence: soil > indoor dust > outdoor dust. The composition of PAHs in soils and dust (indoor and outdoor) showed remarkable differences with prominence of 3- and 5-ring PAHs. The estimated carcinogenic risk to the residents arising from exposure to these concentrations of PAHs in soils, and indoor and outdoor dust from Port Harcourt was above the acceptable target cancer risk value of 10−6. We concluded that these sites require clean-up, remedial actions and implementation of stringent pollution control measures with the intention of reducing the undesirable impacts of PAHs on both the ecosystem and humans.

中文翻译:

尼日利亚哈科特港土壤和室内外灰尘中多环芳烃的分布、来源和暴露风险

在本研究中,我们评估了尼日利亚哈科特港市土壤和室内外灰尘中多环芳烃 (PAH) 的浓度、组成、来源和潜在风险。气相色谱-质谱联用 (GC-MS) 用于检测和定量样品中的 PAH 种类。美国 EPA 16 PAH 加 2-甲基-萘 (∑17 PAHs) 在哈科特港市的土壤和室内外灰尘中的浓度范围为 240 至 38 400、276 至 9130 和 44 至 13 200 μg kg -1(干重,dw) 分别。这些基质中的 PAH 浓度顺序为:土壤 > 室内灰尘 > 室外灰尘。土壤和灰尘(室内和室外)中多环芳烃的组成表现出显着差异,以 3 环和 5 环多环芳烃为主。由于暴露于土壤中这些浓度的多环芳烃以及来自哈科特港的室内和室外灰尘,对居民的估计致癌风险高于可接受的目标癌症风险值 10 -6。我们的结论是,这些场地需要清理、补救行动和实施严格的污染控制措施,以减少多环芳烃对生态系统和人类的不良影响。
更新日期:2021-07-28
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