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首页> 外文期刊>Journal of Solid Waste Technology and Management >Distribution and Bioavailability of Metals in Gasoline Contaminated Sites in Lagos,Nigeria
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Distribution and Bioavailability of Metals in Gasoline Contaminated Sites in Lagos,Nigeria

机译：尼日利亚拉各斯汽油污染场所中金属的分布和生物利用度

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摘要

Distribution of metals in soil of two gasoline contaminated sites in Lagos were studied. Total Concentrations of twenty-five elements were investigated in composite samples collected at different depths within the sites. The elements were determined by ICP-AES after microwave assisted acid digestion of the samples. Chemical fractionation, mobility and potential bioavailability of some of the toxic and EU priority metals e.g., Pb, Cu, Cd, and Fe were evaluated in the topsoil (0-15 cm) by sequential extraction. There were great variation in the concentrations of the elements in both sites with depth. Speciation analysis showed that Pb and Cd dominated the Fe-Mn oxide fraction while the concentrations of Fe and Cu were higher in the residual fraction in site A. In site B, Pb, Cu and Cd was mainly associated with the Fe-Mn oxide fraction, while Fe was in the residual fraction. Cd has the highest mobility factors, 33.2% (site A) and 29.5% (site B), respectively. The concentrations of most of the toxic heavy metals (e.g., Pb, Zn, Cu, Cr, Cd etc.) exceed that of the control samples and heavy metal baseline values around the world. Thus, proper management of these potentially contaminated sites is imperative to prevent human health risk.
机译：研究了拉各斯两个汽油污染场所土壤中金属的分布。在场地内不同深度收集的复合样品中调查了25种元素的总浓度。微波辅助酸消解后，通过ICP-AES测定元素。通过顺序萃取评估了表层土壤（0-15 cm）中某些有毒和EU优先金属，例如Pb，Cu，Cd和Fe的化学分馏，迁移率和潜在的生物利用度。两个位置的元素浓度随深度变化很大。形态分析表明，Pb和Cd在Fe-Mn氧化物组分中占主导地位，而位点A的残留组分中Fe和Cu的浓度较高。在B点中，Pb，Cu和Cd主要与Fe-Mn氧化物组分有关，而Fe在残留部分中。镉具有最高的迁移率，分别为33.2％（地点A）和29.5％（地点B）。大多数有毒重金属（例如Pb，Zn，Cu，Cr，Cd等）的浓度都超过了对照样品和世界各地的重金属基线值。因此，必须对这些潜在污染的地点进行适当的管理，以防止人类健康风险。

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