Assessing anthropogenic contribution to PM2.5 from an urban residential area of Lagos, Nigeria using aliphatic hydrocarbon compounds as indicators

Q3 Environmental Science

Clean Air Journal Pub Date : 2023-12-21 DOI:10.17159/caj/2023/33/2.15790

O. Faboya, K. Fomba, Godwin C. Ezeh, Hartmut Herrmann

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引用次数: 0

Abstract

Aliphatic hydrocarbons in PM2.5 samples from a residential area of Lagos, Nigeria, were quantified using a Curie-point pyrolysis–gas chromatography–mass spectroscopy (CPPGC/MS). The total concentrations of ∑n-alkanes (C20-C34), hopanes (∑4Hopanes), and steranes (∑3Steranes) ranged from 1.8 to 146.6 ng m-3 (avg. 43.6 ± 35.1 ng m-3), 0.0 to 89.9 ng m-3 (avg. 18.7 ± 25.9 ng m-3), and 0.0 to 26.0 ng m-3 (avg. 3.3 ± 6.7 ng m-3), accounting for 0.2%, 0.1%, and 0.01% of the total PM2.5 mass concentrations, respectively. They also accounted for, 1%, 0.4% and 0.1% of the organic matter content, respectively, making them non-negligible component of the organic matter in this region. An evaluation of the n-alkanes source diagnostic indices revealed that engines powered by gasoline and diesel were the main sources of particulate matter aliphatic hydrocarbons in this area of Lagos, consistent with the results obtained from steranes and hopanes profiles. Based on the air mass trajectories, both local and regional air mass transports showed a significant influence on the amounts of carbonaceous materials and aliphatic hydrocarbon compounds arriving at the study site. The results from this study established the occurrence of anthropogenic air pollution in Lagos residential area with a major contribution from petrogenic sources.

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以脂肪烃化合物为指标，评估人为因素对尼日利亚拉各斯城市住宅区 PM2.5 的影响

采用居里点热解-气相色谱-质谱法（CPPGC/MS）对尼日利亚拉各斯居民区 PM2.5 样品中的脂肪族碳氢化合物进行了定量分析。∑n-烷烃（C20-C34）、合烷烃（∑4Hopanes）和甾烷烃（∑3Steranes）的总浓度范围为 1.8 至 146.6 ng m-3（平均值为 43.6 ± 35.1 ng m-3）、0.0 至 89.9 ng m-3（平均值为 18.7 ± 25.9 ng m-3）和 0.0 至 26.0 ng m-3（平均值为 3.3 ± 6.7 ng m-3），分别占 PM2.5 总质量浓度的 0.2%、0.1% 和 0.01%。它们还分别占有机物含量的 1%、0.4% 和 0.1%，是该地区有机物中不可忽视的组成部分。对正构烷烃来源诊断指数的评估显示，以汽油和柴油为动力的发动机是拉各斯这一地区颗粒物脂肪族碳氢化合物的主要来源，这与立体烷烃和啤酒花烷烃剖面得出的结果一致。根据气团轨迹，当地和区域气团运输对到达研究地点的碳质材料和脂肪烃化合物的数量有重大影响。研究结果表明，拉各斯居民区存在人为空气污染，主要来自石油源。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Clean Air Journal Environmental Science-Management, Monitoring, Policy and Law

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： Clean Air Journal is the official publication of the National Association for Clean Air, a not-for-profit organisation. Clean Air Journal is a peer-reviewed journal for those interested in air quality, air quality management, and the impacts of air pollution relevant to Africa. The focus of the journal includes, but is not limited to: Impacts of human activities and natural processes on ambient air quality Air quality and climate change linkages Air pollution mitigation technologies and applications Matters of public policy regarding air quality management Measurement and analysis of ambient and indoor air pollution Atmospheric modelling application and development Atmospheric emissions Other topics on atmospheric physics or chemistry with particular relevance to Africa The scope of the journal is broad, but the core theme of the journal is air quality in Africa.