Complete separation of rare earth elements from small volume seawater samples by automated ion chromatography: method development and application to benthic flux
Complete separation of rare earth elements from small volume seawater samples by automated ion chromatography: method development and application to benthic flux
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DOI：
10.1016/s0304-4203(03)00070-7
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发表时间：
2003-08-01
期刊：
影响因子：
3
通讯作者：
Klinkhammer, GP
中科院分区：
文献类型：
--
作者：
Haley, BA;Klinkhammer, GP
提出了一种离子色谱-电感耦合等离子体质谱（IC-ICP-MS）测定小体积（5 ml）海水样品中单个稀土元素的新方法。该方法被证明是准确的和重现性的小体积的海水参考标准内确定的精度。该方法具有合理的产率（75%），更重要的是，不显示内部压裂个别稀土。在介绍了该方法后，给出了四个地点（三个加州边缘，一个智利边缘）的底部、上覆和界面孔隙沃茨的数据。这些数据表明，有一个稀土元素通量从沉积物到底层水。在这些地点，该通量的范围为10（-11）至10（-8）mol cm（-2）ky（-1），因此与河流输入海洋的通量处于同一量级。当孔隙水和底栖舱水被归一化为PAAS时，REE模式可以用三个描述符来表征：Cc异常的幅度（总是为负），“MREE凸起”和“HREE富集”。“然而，当标准化到底层水时，LREE>HREE，并且存在显著的正Cc异常。这些特征通常支持目前的理解：海洋中的稀土元素受到有机驱动过程的强烈影响。一个关键的条件是，在Cc异常的波动应被认为是溶解的La和Pr的变化的净结果，而不是主要的Ce氧化的功能。(C)2003 Elsevier Science B. V.保留所有权利。
A new Ion Chromatography-Inductively Coupled Plasma Mass Spectrometry (IC-ICP-MS) method is presented for measuring individual rare earth elements (REEs) in small volume (5 ml) seawater samples, with the goal of measuring pore water REEs. The method is shown to be accurate and reproducible for small volumes of a seawater reference standard within the determined precisions. The method has reasonable yield (75%), and, more importantly, is shown to not internally fractionate individual REEs. After describing the method, data from bottom, overlying and interfacial pore waters from four sites (three California margin, one Chile margin) are presented. These data show that there is a REE flux from sediments into bottom water. This flux ranges from 10(-11) to 10(-8) mol cm(-2) ky(-1) at these sites and is, therefore, on the same order as riverine input to the oceans. Benthic chamber samples support these flux estimates.When pore water and benthic chamber water are normalized to PAAS, the REE patterns can be characterized using three descriptors: the magnitude of the Cc anomaly (always negative), a "MREE bulge" and "HREE enrichment." However, when normalized to bottom water, LREE>HREE and there is a significant positive Cc anomaly. These features generally support current understanding: that the REEs in the ocean are strongly influenced by organically driven processes. A key proviso is that the fluctuations in the Cc anomaly should be considered to be the net result of changes in dissolved La and Pr, and not mainly a function of Ce oxidation. (C) 2003 Elsevier Science B.V. All rights reserved.