Department of Biological Sciences, Redeemer's University, Osun State, Nigeria.
School of Chemistry & Physics, University of KwaZulu-Natal, Durban 4000, South Africa; Department of Chemical Sciences, Lead City University, Ibadan, Nigeria.
Sci Total Environ. 2019 Feb 15;651(Pt 2):2943-2952. doi: 10.1016/j.scitotenv.2018.09.386. Epub 2018 Oct 2.
Petroleum contamination is a significant contributor of elevated level of toxic heavy metals, which are of great concern to human health, due to their non-biodegradable nature. Agaye community has experienced frequent gasoline spills due to pipeline vandalisation, resulting in the contamination of soil and water sources. The concentrations of metals (Cd, Cr, Cu, Mn, Ni, Pb, V and Zn) in groundwater, surface-water and soil were determined from a total of 216 samples acquired bi-monthly for two years by Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) to evaluate the impact of oil spills. Multivariate analyses using principal component analysis (PCA) and cluster analysis (CA) were also used to study the interactions between metals and identify the possible sources of contamination. The concentrations of heavy metals in soil and water samples (surface and groundwater) were in decreasing order of Mn > Ni > Zn > Cu > V > Cr > Pb > Cd and Ni > Zn > V > Cu > Mn > Pb > Cr > Cd respectively. Ni concentration ranged from 0.42-8.05 mg kg and 0.10-2.85 mg L for soil and groundwater respectively. Ni and V were more enhanced (P < 0.05) in soil samples. This study showed that there was significant relationship between elevated levels of Cr, Cu, Ni and Zn and oil spillage, due to petroleum spills and that residents were vulnerable to and at greater risk of non-carcinogenic hazards if they consumed groundwater. Multivariate analyses showed significant anthropogenic intrusions of two diagnostic heavy metals (Ni and V) for petroleum contamination in the soils and water sources.
石油污染是有毒重金属含量升高的一个重要原因，由于其不可生物降解的性质，这些重金属对人类健康构成了极大的威胁。阿加耶社区经常发生因管道破坏导致的汽油泄漏事件，导致土壤和水源受到污染。在两年内，每隔两个月共采集了 216 个样本，使用电感耦合等离子体-光学发射光谱法（ICP-OES）测定地下水、地表水和土壤中的金属（Cd、Cr、Cu、Mn、Ni、Pb、V 和 Zn）浓度，以评估石油泄漏的影响。还使用主成分分析（PCA）和聚类分析（CA）等多元分析来研究金属之间的相互作用，并确定污染的可能来源。土壤和水样（地表水和地下水）中重金属的浓度按 Mn＞Ni＞Zn＞Cu＞V＞Cr＞Pb＞Cd 和 Ni＞Zn＞V＞Cu＞Mn＞Pb＞Cr＞Cd 的顺序递减。土壤中 Ni 的浓度范围为 0.42-8.05mgkg，地下水中 Ni 的浓度范围为 0.10-2.85mgL。土壤样品中 Ni 和 V 的浓度更高（P＜0.05）。本研究表明，Cr、Cu、Ni 和 Zn 水平升高与石油泄漏有显著关系，由于石油泄漏，居民如果饮用地下水，更容易受到非致癌危害的影响，并且面临更大的风险。多元分析表明，土壤和水源中存在两种诊断性重金属（Ni 和 V）的人为入侵，表明存在石油污染。
