Comment on “On the importance of opal, carbonate, and lithogenic clays in scavenging and fractionating 230Th, 231Pa and 10Be in the ocean” by S. Luo and T.-L. Ku
Comment on “On the importance of opal, carbonate, and lithogenic clays in scavenging and fractionating 230Th, 231Pa and 10Be in the ocean” by S. Luo and T.-L. Ku
复制标题
对 S. Luo 和 T.-L 撰写的“论蛋白石、碳酸盐和成岩粘土在海洋中清除和分馏 230Th、231Pa 和 10Be 的重要性”发表评论。
DOI：
10.1016/s0012-821x(04)00028-7
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发表时间：
2004
影响因子：
5.3
通讯作者：
R. Anderson
中科院分区：
文献类型：
--
作者：
Z. Chase;R. Anderson
Luo和Ku重新分析了我们在2002年发表的数据集的一部分，以解决不同颗粒相（有机碳，成岩物质，蛋白石和碳酸钙）对钍，钚和铍的差异清除问题。他们在重新分析后得出结论，这些数据与他们早先的基于沉积物分离实验的提议一致，即成岩物质对Th的亲和力比生物相大500倍。虽然我们欢迎新的分析和新的解释我们的数据集，但不得不反对他们的结论，即Th在成岩颗粒上吸附的分配系数（Kd（Th）_L）约为2.3×108，远大于Th在碳酸钙上吸附的Kd（Kd（Th）_C）。在这里，我们表明，这样一个高值的Kd（Th）_L是不一致的大量的观察。这些结果表明，Kd（Th）_L值接近1×107，与我们以前的研究结果一致。
Luo and Ku have reanalyzed part of the data set we published in 2002 to address the question of the differential scavenging of thorium, protactinium and beryllium by different particulate phases (organic carbon, lithogenic material, opal and calcium carbonate). They conclude upon reanalysis that the data are consistent with their earlier proposal, based on sediment separation experiments, that lithogenic material possesses an affinity for Th some 500 times greater than do biogenic phases. While we welcome new analyses and fresh interpretations of our data set we have to disagree with their conclusion that the partition coefficient (Kd) for adsorption of Th onto lithogenic particles (Kd(Th)_L) is on the order of 2.3×108, and far greater than the Kdfor adsorption of Th onto calcium carbonate (Kd(Th)_C). Here we show that such a high value for Kd(Th)_L is inconsistent with a large body of observations. These observations suggest Kd(Th)_L is closer to 1×107, consistent with our previous study.