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首页> 外文期刊>Journal of soil & sediments >Concentrations and geochemical fractions of rare earth elements in two different marsh soil profiles at the North Sea, Germany
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Concentrations and geochemical fractions of rare earth elements in two different marsh soil profiles at the North Sea, Germany

机译：德国北海两种不同沼泽土壤剖面中稀土元素的浓度和地球化学分数

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摘要

Purpose The purpose of this study was (1) to determine the vertical distribution of rare earth element (REE) concentrations, stocks, and geochemical fractions in two different marsh soil profiles and (2) to quantify the relations between REEs and soil properties. Materials and methods A sandy Fluvisol recently flooded by tidal water and a clayey Gleysol landward the dike impacted by fluctuating groundwater levels served as reference marsh soils. An aqua regia extraction was used to determine the concentrations of REEs; additionally, a sequential extraction procedure developed by the Commission of the European Communities Bureau of Reference was conducted to assess the geochemical fractions (exchangeable, reducible, oxidisable, residual fraction) of REEs. Both extractions were carried out according to genetic horizons. The stocks of REEs were calculated and the relations between physico-chemical soil properties and concentrations/mobility of REEs were quantified via correlation analysis. Results and discussion The aqua regia extractable REE concentrations and stocks of the Gleysol were about two times higher compared to the Fluvisol since the Gleysol was more clayey and REEs might adsorb onto clay minerals. We have detected small differences of REE concentrations and geochemical fractions between the horizons of the single profiles. Rare earth elements existed mainly in residual or reducible fraction, followed by oxidisable, and water soluble/ exchangeable/carbonate bound fraction. The most striking difference between the two marsh soil profiles regarding the geochemical fractions was the higher residual fraction in the Fluvisol than in the Gleysol what seemed to be due to the lower aqua regia extractable concentration in the former. Conclusions The aqua regia extractable concentration as well as reduction and oxidation processes of (amorphous) iron and manganese complexes seemed to have the most important impact on the geochemical fractions of REEs in the studied marsh soil profiles. In future, those findings should be verified in further marsh soils worldwide. In particular, future studies should elucidate the specific release kinetics of REEs and their determining factors.
机译：目的这项研究的目的是（1）确定两种不同沼泽土壤剖面中稀土元素（REE）浓度，储量和地球化学分数的垂直分布，以及（2）量化REE与土壤性质之间的关系。材料和方法最近被潮水淹没的沙质Fluvisol和黏土Gleysol使受地下水水位波动影响的堤坝向陆移动，作为参考沼泽土壤。王水提取物用于确定稀土元素的浓度。此外，还执行了由欧洲共同体参考委员会开发的顺序提取程序，以评估稀土元素的地球化学成分（可交换，可还原，可氧化，残留分数）。两种提取均根据遗传视野进行。计算了稀土元素的储量，并通过相关分析定量了理化土壤性质与稀土元素浓度/迁移率之间的关系。结果与讨论相比于Fluvisol，王水可提取的REE浓度和Gleysol的储量大约是Fluvisol的两倍，因为Gleysol的黏性更高，并且REE可能吸附在粘土矿物上。我们已经检测到单个剖面的地平线之间的REE浓度和地球化学分数存在细微差异。稀土元素主要存在于残留或可还原的馏分中，其次是可氧化的和水溶性/可交换/与碳酸盐结合的馏分。关于地球化学成分，两种沼泽土壤剖面之间最显着的差异是氟维索尔中的残留分数要高于Gleysol中的残留分数，这似乎是由于前者的王水可提取浓度较低。结论在所研究的沼泽土壤剖面中，王水的可提取浓度以及（非晶态）铁和锰配合物的还原和氧化过程似乎对REEs的地球化学成分具有最重要的影响。将来，这些发现应在全球其他沼泽土壤中得到验证。特别是，未来的研究应阐明稀土元素的释放动力学及其决定因素。

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  • 来源
    《Journal of soil & sediments》 |2014年第8期|1417-1433|共17页
  • 作者

    Julia Mihajlovic; Luise Giani; Hans-Joachim Stark; Jorg Rinklebe;

  • 作者单位

    Department D, Soil- and Groundwater-Management, University of Wuppertal, Pauluskirchstrafie 7,42285 Wuppertal, Germany;

    Department of Biology and Environmental Sciences, Soil Science,Carl von Ossietzky University Oldenburg,Carl-von-Ossietzky-Strafle 9-11,26111 Oldenburg, Germany;

    Department of Analytical Chemistry,UFZ - Helmholtz Centre for Environmental Research,PermoserstraBe 15, 04318 Leipzig, Germany;

    Department D, Soil- and Groundwater-Management, University of Wuppertal, Pauluskirchstrafie 7,42285 Wuppertal, Germany;

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  • 正文语种 eng
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  • 关键词

    Clay; Fluvisol; Gleysol; Iron-manganese oxides; Paddy soils; Sequential extraction;

    机译：粘土;氟维索尔;格列索尔;铁锰氧化物;水稻土;顺序提取;

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