Abstract Elemental composition and heavy metal speciation of the soils of Ejigbo oil depot, Lagos state, Nigeria were determined to assess the contamination status of the study area. Oil-impacted and control soils were collected from the oil depot and uncontaminated areas respectively. Pb, Cu, Zn, Cd, Cr, Ni, As, and Fe concentrations in the soils were determined using Atomic absorption spectrometry. Contamination factor (CF) and geo-accumulation index were used to determine the contamination/pollution status of the study area. Geo-accumulation index results indicated that the test soils fall into the unpolluted category (<0) for Cd, Fe, Pb, As, and Zn, while there was unpolluted to moderate pollution (between 0 and 1) for Cu, Ni, and Cr. CF results suggested that the oil depot was contaminated with all the analyzed metals as the CFs were >1. Inter-element clustering equally existed between the analyzed metals. Speciation analysis results showed relatively high bioavailability and mobility potential for Cd and Zn. The study concluded that the soil of the oil depot, whose elemental concentrations exceeded those of the control soils, was impacted with the analyzed metals. Remediation schemes should be developed to clean up the metal in the oil depot soil.

中文翻译：

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精炼石油产品库周围土壤中的金属分馏

摘要 测定了尼日利亚拉各斯州埃吉博油库土壤的元素组成和重金属形态，以评估研究区的污染状况。分别从油库和未污染区域收集受油污和对照土壤。使用原子吸收光谱法测定土壤中的 Pb、Cu、Zn、Cd、Cr、Ni、As 和 Fe 浓度。污染因子（CF）和地累积指数用于确定研究区的污染/污染状况。地积累指数结果表明，试验土壤中 Cd、Fe、Pb、As 和 Zn 属于未污染类别（<0），而 Cu、Ni 和铬。CF 结果表明油库被所有分析的金属污染，因为 CF > 1。分析的金属之间同样存在元素间聚类。形态分析结果显示 Cd 和 Zn 具有相对较高的生物利用度和迁移潜力。该研究得出结论，油库土壤的元素浓度超过对照土壤的元素浓度，受到分析金属的影响。应制定修复计划以清理油库土壤中的金属。