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首页> 外文期刊>Environmental Science & Technology >Evidence for Hydroxamate Siderophores and Other N-Containing Organic Compounds Controlling ~(239,240)Pu Immobilization and Remobilization in a Wetland Sediment
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Evidence for Hydroxamate Siderophores and Other N-Containing Organic Compounds Controlling ~(239,240)Pu Immobilization and Remobilization in a Wetland Sediment

机译：湿地沉积物中〜（239,240）Pu固定和固定的异羟肟酸酯铁载体和其他含N的有机化合物的证据

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摘要

Pu concentrations in wetland surface sediments collected downstream of a former nuclear processing facility in F-Area of the Savannah River Site (SRS), USA, were ～2.5 times greater than those measured in the associated upland aquifer sediments; similarly, the Pu concentration solid/water ratios were orders of magnitude greater in the wetland than in the low-organic matter content aquifer soils. Sediment Pu concentrations were correlated to total organic carbon and total nitrogen contents and even more strongly to hydroxamate siderophore (HS) concentrations. The HS were detected in the particulate or colloidal phases of the sediments but not in the low molecular weight fractions (＜1000 Da). Macromolecules which scavenged the majority of the potentially mobile Pu were further separated from the bulk mobile organic matter fraction ("water extract") via an isoelectric focusing experiment (IEF). An electrospray ionization Fourier-transform ion cyclotron resonance ultrahigh resolution mass spectrometry (ESI FTICR-MS) spectral comparison of the IEF extract and a siderophore standard (desferrioxamine; DFO) suggested the presence of HS functionalities in the IEF extract. This study suggests that while HS are a very minor component in the sediment particulate/colloidal fractions, their concentrations greatly exceed those of ambient Pu, and HS may play an especially important role in Pu immobilization/remobilization in wetland sediments.
机译：在美国萨凡纳河站点（SRS）F区的一个前核处理设施下游收集的湿地表层沉积物中的Pu浓度是相关高地含水层沉积物中测量值的约2.5倍；同样，在湿地中，Pu浓度的固/水比要比低有机物含量的含水层土壤大几个数量级。沉积物中Pu的浓度与总有机碳和总氮含量相关，甚至与异羟肟酸酯铁离子（HS）浓度更相关。在沉积物的颗粒相或胶体相中检测到HS，但在低分子量级分（＜1000 Da）中未检测到。通过等电聚焦实验（IEF），将清除了大部分可能移动的Pu的大分子与大量的移动有机质部分（“水提取物”）分离。电喷雾电离傅立叶变换离子回旋共振超高分辨率质谱（ESI FTICR-MS）光谱对IEF提取物和铁载体标准品（去铁胺）的比较表明IEF提取物中存在HS功能。这项研究表明，尽管HS在沉积物颗粒/胶体部分中的含量很小，但其浓度却大大超过了环境Pu的浓度，HS在湿地沉积物的Pu固定/迁移中可能起着特别重要的作用。

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  • 来源
    《Environmental Science & Technology》 |2015年第19期|11458-11467|共10页
  • 作者

    Chen Xu; Saijin Zhang; Daniel I. Kaplan; Yi-Fang Ho; Kathleen A. Schwehr; Kimberly A. Roberts; Hongmei Chen; Nicole DiDonato; Matthew Athon; Patrick G. Hatcher; Peter H. Santschi;

  • 作者单位

    Department of Marine Sciences, Texas A&M University, Building 3029, Galveston, Texas 77554, United States;

    Department of Marine Sciences, Texas A&M University, Building 3029, Galveston, Texas 77554, United States;

    Savannah River National Laboratory, Aiken, South Carolina 29808, United States;

    Department of Marine Sciences, Texas A&M University, Building 3029, Galveston, Texas 77554, United States;

    Department of Marine Sciences, Texas A&M University, Building 3029, Galveston, Texas 77554, United States;

    Savannah River National Laboratory, Aiken, South Carolina 29808, United States;

    Department of Chemistry and Biochemistry, College of Sciences, Old Dominion University, Norfolk, Virginia 23529, United States;

    Department of Chemistry and Biochemistry, College of Sciences, Old Dominion University, Norfolk, Virginia 23529, United States;

    Department of Marine Sciences, Texas A&M University, Building 3029, Galveston, Texas 77554, United States;

    Department of Chemistry and Biochemistry, College of Sciences, Old Dominion University, Norfolk, Virginia 23529, United States;

    Department of Marine Sciences, Texas A&M University, Building 3029, Galveston, Texas 77554, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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