Dissolved indium and rare earth elements in three Japanese rivers and Tokyo Bay: Evidence for anthropogenic Gd and In
Dissolved indium and rare earth elements in three Japanese rivers and Tokyo Bay: Evidence for anthropogenic Gd and In
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DOI：
10.1016/s0016-7037(00)00472-5
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发表时间：
2000-12
影响因子：
5
通讯作者：
Y. Nozaki;D. Lerche;D. Alibo;M. Tsutsumi
中科院分区：
文献类型：
--
作者：
Y. Nozaki;D. Lerche;D. Alibo;M. Tsutsumi
本文报道了日本Ara、Tama、Tone河口和东京湾中溶解（<0.04 μm）稀土元素（ree）和稀土元素（In）的新数据。独特的页岩归一化稀土模式具有明显的正Gd异常和强烈的重稀土富集。溶解的Gd异常是由局部人为输入引起的，主要是由于最近在医院使用加多戊酸作为磁共振成像（MRI）的医疗剂。重稀土元素的富集可能与河流上游风化运移过程中的分馏作用有关，部分原因与超滤技术对轻、中稀土元素富集的河流胶体的去除有关。与其他地方报道的泰国湄南河（Chao Phraya river）的原始河流相比，日本河流中的溶解物浓度异常高（Nozaki et al., In press）。与Gd一样，研究区域的高溶解In也可归因于最近在医学诊断中使用的含In有机化合物In(DTPA)2−。因此，在人口密集和工业化地区，河流和河口溶解的重金属浓度可能受到人类活动的严重干扰，需要进一步调查这些人为可溶性物质在海洋环境中的命运。
New data on the dissolved (<0.04 μm) rare earth elements (REEs) and In in the Japanese Ara, Tama, and Tone river-estuaries and Tokyo Bay are presented. Unique shale-normalized REE patterns with a distinct positive Gd anomalies and a strong heavy-REE enrichment were seen throughout the data. The dissolved Gd anomaly is caused by local anthropogenic input mainly due to recent use of Gado-pentetic acid as a medical agent for magnetic resonance imaging (MRI) in hospitals. The heavy-REE enrichment may be attributed to fractionation during weathering and transport in the upstream of the rivers, and only partially to removal of light- and middle-REE enriched river colloids by the use of a new ultrafiltration technique. Dissolved In concentrations in the Japanese rivers are extraordinarily high as compared to those in the pristine Chao Phraya river of Thailand reported elsewhere (Nozaki et al., in press). Like Gd, the high dissolved In in the study area can also be ascribed to recent use of In-containing organic compound, In(DTPA)2−in medical diagnosis. Thus, in the highly populated and industrialized area, dissolved heavy metal concentrations in rivers and estuaries may be significantly perturbed by human activities and the fate of those anthropogenic soluble substances in the marine environment needs to be investigated further.