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Rare earth elements in intertidal sediments of Bohai Bay, China: Concentration, fractionation and the influence of sediment texture

机译:渤海湾潮间带沉积物中的稀土元素:浓度,分馏和沉积物质地的影响

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摘要

Surface sediments from intertidal Bohai Bay were assessed using a four-step sequential extraction procedure to determine their concentrations of rare earth elements (REEs) and the chemical forms in which those elements were present The normalized ratios La/Gd and La/Yb showed that LREE contents were not significantly higher than the middle REEs or HREE contents. A negative Ce anomaly and positive Eu were observed in sand and silty sand sediments, whereas no significant Ce or Eu anomaly was found in clayey silt sediments. Residual fraction of REEs accounted for the majority of their total concentrations. Middle REEs were more easily leached than other REEs, especially in clayey silt sediment REEs contents in the surface sediment from the intertidal Bohai Sea were consistent with data from the upper continental crust and China shallow sea sediments, indicating that they were generally unaffected by heavily anthropogenic effects from adjacent areas. (C) 2014 Elsevier Inc. All rights reserved.
机译:使用四步顺序提取程序评估了潮间带渤海湾的表层沉积物,以确定其稀土元素(REE)的浓度以及存在这些元素的化学形式。归一化比例La / Gd和La / Yb表明,LREE稀土元素含量不明显高于中等稀土元素或稀土元素含量。在砂质和粉质砂质沉积物中观测到负的Ce异常,而在泥质粉质沉积物中未发现明显的Ce或Eu异常。 REE的残留部分占其总浓度的大部分。中部稀土元素比其他稀土元素更容易浸出,特别是在黏土粉砂沉积物中,潮间带渤海表层沉积物中的稀土元素含量与上陆壳和中国浅海沉积物的数据一致,表明它们一般不受强烈的人为影响邻近区域的影响。 (C)2014 Elsevier Inc.保留所有权利。

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