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Geochemical speciation of trace metals in sediments of the northern Nile Delta Lake by sequential extraction technique
Chemistry and Ecology ( IF 2.5 ) Pub Date : 2020-02-11 , DOI: 10.1080/02757540.2020.1718118
Mohamed A. Okbah 1 , Maie I. El-Gammal 2 , Mahmoud S. Ibrahim 2 , Yousef A. A. Waheshi 3
Affiliation  

ABSTRACT The present study was performed to investigate surface sediment samples from Lake Edku of the Nile Delta Lagoons, Egypt. The Lake is important for fishing in the region. The importance of research is to understand the mobility and bioavailability of each studied metal. The study was carried out on 10 sampling sites during 2017. The sediments were subjected to the technique of sequential extraction to examine the chemical forms of some trace metals (Fe, Mn, Zn, Cu, Pb and Ni). Five stage extractions were done as the following order: soluble and exchangeable, carbonate, iron and manganese oxides, organic matter fraction and residual fraction. Attained results from the five fractions showed variations in the concentrations of metal contents of different sites under study. The overall metal concentrations (%) in the initial four extractable fractions (exchangeable, carbonate, oxides and organic matter fractions) were assessed to configure the mobility of each studied metal. The risk assessment code (RAC) represents the summation of exchangeable and carbonate fractions, it was between low and medium risk for aquatic environment. The range percentage of RAC for the metals was in the following order: 1.8–13, 4–23.5, 15–26, 5.7–19.5, 9–25 and 4.8–18.2 for Fe, Mn, Zn, Cu, Pb and Ni, respectively. Approximately 30% of the total copper was associated to the organic fraction, which may represent a high mobility of copper in these sediments. The highest mobility of metals in the sediments could be confirmed by its bioavailability factor (BF), which was within the ranges of 0.32–0.61, 0.36–0.59, 0.64–0.83, 0.36–0.72, 0.37–0.62 and 0.52–0.78 for Fe, Mn, Zn, Cu, Pb and Ni, respectively. The BF exhibited the following order: Zn > Ni > Cu > Pb ≈ Mn > Fe. The high levels of BF for the studied metals may represent the potentiality for toxic metals to be easily released into the aquatic environment.

中文翻译:

尼罗河三角洲北部沉积物中痕量金属的地球化学形态序列提取技术

摘要 本研究旨在调查埃及尼罗河三角洲泻湖埃德库湖的表层沉积物样本。该湖是该地区捕鱼的重要场所。研究的重要性在于了解每种研究金属的流动性和生物利用度。该研究于 2017 年在 10 个采样点进行。对沉积物进行顺序提取技术,以检查一些痕量金属(Fe、Mn、Zn、Cu、Pb 和 Ni)的化学形态。按以下顺序进行五阶段提取:可溶和可交换、碳酸盐、铁和锰氧化物、有机物部分和残余部分。从五个部分获得的结果显示所研究的不同位点的金属含量浓度存在差异。评估最初四个可提取部分(可交换、碳酸盐、氧化物和有机物部分)中的总金属浓度 (%) 以配置每种研究金属的迁移率。风险评估代码(RAC)代表可交换部分和碳酸盐部分的总和,它对水生环境的风险介于中低风险之间。金属的 RAC 范围百分比按以下顺序排列:Fe、Mn、Zn、Cu、Pb 和 Ni:1.8-13、4-23.5、15-26、5.7-19.5、9-25 和 4.8-18.2,分别。大约 30% 的总铜与有机部分有关,这可能代表铜在这些沉积物中的高流动性。沉积物中金属的最高流动性可以通过其生物利用度因子(BF)来证实,其范围为 0.32-0.61、0.36-0.59、0.64-0.83、0.36-0.72、0.37-0。Fe、Mn、Zn、Cu、Pb 和 Ni 分别为 62 和 0.52–0.78。BF 表现出以下顺序:Zn > Ni > Cu > Pb ≈ Mn > Fe。所研究金属的高浓度 BF 可能代表有毒金属很容易释放到水生环境中的可能性。
更新日期:2020-02-11
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