The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire
The mobility of the trace metals copper, zinc, lead, cobalt, and nickel in tropical estuarine sediments, Ebrie Lagoon, Côte d’Ivoire
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DOI：
10.1007/s11368-018-2062-8
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发表时间：
2018-06
影响因子：
3.6
通讯作者：
N’guessan Louis Berenger Kouassi;K. M. Yao;N. Sangare;A. Trokourey;Bernard Soro Métongo
中科院分区：
文献类型：
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作者：
N’guessan Louis Berenger Kouassi;K. M. Yao;N. Sangare;A. Trokourey;Bernard Soro Métongo
目的微量金属在食物网中积聚，可能对人类健康和水生生物群构成高风险。我们研究了表层沉积物（0-5 cm）中铜、锌、铅、钴和镍迁移率的季节和空间变化及其潜在毒性。材料和方法在雨季和旱季在埃布里泻湖（科特迪瓦）的三个海湾进行了采样。使用顺序和动力学萃取方法评估铜、锌、铅、钴和镍的迁移率及其潜在毒性。进行方差分析（ANOVA）以确定空间和季节差异。结果和讨论结果表明，与Co相反，沉积物部分中Zn和Cu的分布模式没有表现出空间和季节变化。另一方面，各海湾的铅和镍分布模式差异很大，但没有季节性。然而，应该进行长时间的重复测量，以更好地了解沉积物相中金属分布的季节变化。海湾中残余物含量丰富（56.93%~71.66%），包括 Cu、Pb、Co 和 Ni。相反，很大一部分 Zn（高达 70%）可以被重新激活。 Cu、Pb、Co 和 Ni 在沉积物中主要形成惰性络合物，而 Zn 形成不稳定络合物。 Zn 可能对生物群构成高风险，Co 和 Ni 为中等风险，Cu 和 Pb 为低风险。结论 序贯法和动力学法的结合表明，Zn 和 Pb 在可交换组分和铁/锰氧化物组分中形成不稳定复合物。连续萃取显示铁/锰氧化物中的铅浓度很高。因此，锌和铅可能是高度可用的，这证实了鱼类铅浓度超过了先前研究发现的世界卫生组织安全限值。因此，通过连续萃取方法获得的可交换馏分和铁/锰氧化物馏分可以更好地评估金属的潜在迁移率。
PurposeTrace metals accumulate in the food web and can pose high risks to human health and aquatic biota. We investigated seasonal and spatial variations of Cu, Zn, Pb, Co, and Ni mobility in surface sediments (0–5 cm) and their potential toxicity.Materials and methodsThe sampling was carried out in three embayments of the Ebrie Lagoon (Côte d’Ivoire) during the rainy and dry seasons. The sequential and kinetic extraction methods were used to assess Cu, Zn, Pb, Co, and Ni mobility and their potential toxicity. Analysis of variance (ANOVA) was performed to ascertain spatial and seasonal differences.Results and discussionThe results showed that contrarily to Co, distribution patterns of Zn and Cu in the sediment fractions showed no spatial and seasonal variability. On the other hand, Pb and Ni distribution patterns varied highly across the bays but not seasonally. Nevertheless, repeated measurements over a long period of time should be carried out to better understand the seasonal variability of metal distribution in sediment phases. Cu, Pb, Co, and Ni were abundant in residual fraction (56.93–71.66%) in the bays. On the contrary, a very high portion of Zn (up to 70%) could be remobilized. Cu, Pb, Co, and Ni formed mainly inert complexes in sediments, while Zn formed labile complexes. Zn could pose high risk to biota, Co and Ni a medium risk, and Cu and Pb a low risk.ConclusionsA combination of both sequential and kinetic methods revealed that both Zn and Pb formed labile complexes in the exchangeable and iron/manganese oxide fractions. Sequential extraction showed high Pb concentrations in the iron/manganese oxides. Thus, Zn and Pb may be highly available, which confirmed fish Pb concentrations exceeding WHO safe limits found by previous studies. Therefore, potential mobility of metals could be better assessed by the exchangeable and iron/manganese oxide fractions obtained by sequential extraction methods.