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首页> 外文期刊>Estuarine Coastal and Shelf Science >Assessment of copper, cadmium and zinc remobilization in Mediterranean marine coastal sediments
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Assessment of copper, cadmium and zinc remobilization in Mediterranean marine coastal sediments

机译：评估地中海海洋沿海沉积物中铜，镉和锌的迁移

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摘要

The remobilization of copper, cadmium and zinc in sediments of three selected coastal microenviron-ments of the Aegean Sea (Eastern Mediterranean) is assessed. Various analytical methods and techniques were employed providing concentrations, profiles and forms of metals and organic matter in sediments and pore waters. At Loutropyrgos, a non-industrial site located, however, within an intensively industrialized enclosed gulf, an intense resupply of zinc in pore water from sediment was recorded, correlating with the highest value of weakly bound fraction of zinc determined at this area. The comparatively high zinc concentrations measured in the pore waters (394 nM), exceed considerably those in the overlying seawater (12.5 nM determined by DGT; 13.5 nM total), resulting in the formation of a strong concentration gradient at the sediment—water interface. Potential zinc flux at the sediment-water interface at Loutropyrgos (based on 0.4 mm DGT profile) was calculated equal to 0.8 mmo.m~(-2.d~(-1)). The half lives of trace metals at Loutropyrgos site, based on the aforementioned DGT profiles, amount to 0.1 y (Zn), 2.8 y (Cd), 4.5 y (Cu), 2.2 y (Mn) and 0.4 y (Fe) pointing out to the reactivity of these metals at the sediment-water interface. The concentration of dissolved organic carbon (DOC) in pore waters of the three selected sites (2.7-5.2 mg/L) was up to four times higher compared to that of the corresponding overlying seawater. Similarly, the concentrations of carbohydrates in pore waters (0.20-0.91 mg/L monosaccharides; 0.71-1.6 mg/L poly-saccharides) are an order of magnitude higher than those of seawater, forming a concentration gradient at the sediment-water interface. Total carbohydrates contribute between 34 and 48% of the organic carbon of the pore waters, being significantly higher than those of seawater from the corresponding areas, which were in the range of 15-21%. The complexing capacity as for copper ions (CCu) determined in pore water ranges widely, from 0.03 nM at Kalamos to 3.76 nM at Molos, whereas the corresponding values for cadmium ions (CCd) were non detectable, except for Kalamos site, where the value for CCd was equal to 0.03 nM. A significant increase in the values of CCu, normalized as for DOC, was observed in pore waters in relation to those of overlying seawater. This indicates an 'enrichment' of pore waters in dissolved organic ligands for copper ions per unit of DOC. Up to 72% of DOC could be present as ligands capable to complex copper ions.
机译：评估了爱琴海（地中海东部）的三个选定沿海微环境沉积物中铜，镉和锌的迁移。采用了各种分析方法和技术，以提供沉积物和孔隙水中金属和有机物的浓度，分布和形式。在Loutropyrgos的一个非工业场所，但是，在一个集约化工业化的封闭海湾中，记录了沉积物中孔隙水中锌的大量补给，这与该地区测得的锌的弱结合部分的最高值有关。在孔隙水中测得的相对较高的锌浓度（394 nM）远远超过上覆海水中的锌浓度（通过DGT测定为12.5 nM；总计为13.5 nM），从而在沉积物-水界面形成了很强的浓度梯度。计算出Loutropyrgos沉积物-水界面的潜在锌通量（基于0.4 mm DGT剖面）等于0.8 mmo.m〜（-2.d〜（-1））。根据上述DGT曲线，Loutropyrgos站点上的痕量金属的半衰期分别为0.1 y（Zn），2.8 y（Cd），4.5 y（Cu），2.2 y（Mn）和0.4 y（Fe）。这些金属在沉积物-水界面的反应性。与相应的上覆海水相比，三个选定地点（2.7-5.2 mg / L）的孔隙水中溶解有机碳（DOC）的浓度高出四倍。同样，孔隙水中碳水化合物的浓度（0.20-0.91 mg / L单糖； 0.71-1.6 mg / L多糖）比海水中的浓度高一个数量级，在沉积物-水界面处形成浓度梯度。总碳水化合物占孔隙水有机碳的34％至48％，明显高于相应地区的海水的15％至21％。孔隙水中测定的铜离子（CCu）络合能力范围很宽，从Kalamos的0.03 nM到Molos的3.76 nM，而镉离子（CCd）的相应值则无法检测到，除了Kalamos位置，该值CCd等于0.03nM。相对于上覆海水，在孔隙水中观察到的CCu值（按DOC标准化）显着增加。这表明每单位DOC中的铜离子在溶解的有机配体中的孔隙水“富集”。高达72％的DOC可以作为能够络合铜离子的配体存在。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第1期|p.1-12|共12页
  • 作者

    Aikaterini Sakellari; Marta Plavsic; Sotiris Karavoltsos; Manos Dassenakis; Michael Scoullos;

  • 作者单位

    University of Athens, Department of Chemistry, Div. Ill, Laboratory of Environmental Chemistry, Panepistimiopolis Zografou, 157 71 Athens, Greece;

    Ruder Boskovic Institute, Center for Marine and Environmental Research, P.O. Box 180, 10002 Zagreb, Croatia;

    University of Athens, Department of Chemistry, Div. Ill, Laboratory of Environmental Chemistry, Panepistimiopolis Zografou, 157 71 Athens, Greece;

    University of Athens, Department of Chemistry, Div. Ill, Laboratory of Environmental Chemistry, Panepistimiopolis Zografou, 157 71 Athens, Greece;

    University of Athens, Department of Chemistry, Div. Ill, Laboratory of Environmental Chemistry, Panepistimiopolis Zografou, 157 71 Athens, Greece;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    trace metals; remobilization; organic matter; sediments; pore water; complexing capacity;

    机译：微量金属;迁移;有机物;沉积物;孔隙水;络合能力;

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