Variation of the distribution coefficients of rare earth elements in modern coral-lattices: Species and site dependencies
Variation of the distribution coefficients of rare earth elements in modern coral-lattices: Species and site dependencies
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DOI：
10.1016/j.gca.2003.12.014
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发表时间：
2004-05-01
影响因子：
5
通讯作者：
Nakano, Y
中科院分区：
文献类型：
--
作者：
Akagi, T;Hashimoto, Y;Nakano, Y
分析了四种珊瑚碳酸盐晶格中稀土元素的含量，并与环境海水中溶解稀土元素进行了比较。珊瑚来自两个不同盐度的地区，海洋（34-34.5）和海湾（33-34）。珊瑚样品经洗涤、乙酸消解、稀土富集后，用电感耦合等离子体质谱法（ICP-MS）测定了珊瑚中的稀土元素。两种海水中稀土元素含量差异较大，海湾区高出10倍，且轻稀土富集。然而，平均分配系数（D）在这两个地区几乎是相同的。大量的分配系数之间的差异，观察到的四种珊瑚和D的物种间的变化幅度也是物种依赖性。理论计算表明，pH值的变化可能会导致D的变化大到足以解释两个地区之间的小差异。版权所有（C）2004 Elsevier Ltd.
Rare earth element (REE) concentrations in the carbonate lattice of four species of coral have been analyzed and compared with the dissolved REE in ambient seawaters. The corals were from two areas of different salinity, marine (34-34.5) and bay (33-34). The measurement of REE in coral was carried Out with inductively Coupled plasma mass spectrometry (ICP-MS) after meticulous washing of coral samples, digestion with acetic acid and preconcentration of REE. The concentrations of REE in the two ambient seawaters were quite different, being ten-times higher in the bay area and enriched in light REE. However, the average distribution coefficients (D's) were almost identical in the two areas. Substantial distribution coefficient differences were observed among the four coral species and the magnitude of inter-species variation in D was also species-dependent. Theoretical calculations imply that pH variation could cause variations in D large enough to account for the small differences between the two areas. Copyright (C) 2004 Elsevier Ltd.