首页> 外文期刊>Journal of oceanography >Geochemistry of Rare Earth Elements in the Dissolved, Acid-Soluble and Residual Phases in Surface Waters of the Changjiang Estuary
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Geochemistry of Rare Earth Elements in the Dissolved, Acid-Soluble and Residual Phases in Surface Waters of the Changjiang Estuary

机译:长江口地表水中溶解态,酸溶态和残留相中的稀土元素地球化学

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摘要

The concentrations of rare earth elements in the dissolved, acid-soluble and residual phases in surface waters of the Changjiang Estuary were determined using ICP-MS. The main purposes of the study are to understand the estuarine geochemistry of rare earth elements and to explore water-particle interactions in the Changjiang estuarine mixing zone. The results show that there are two distinct processes operating on dissolved rare earth elements in the estuary: large scale removal at low salinities due to salt-induced coagulation and remarkable release at mid to high salinities. These processes result in modification of the effective river water flux and the systematical fractionation of the dissolved rare earth elements toward the East China Sea. The increase in concentration of dissolved rare earth elements in the mid to high salinity waters of the Changjiang Estuary suggests a sediment source in the mixing zone of the estuary, which is located over a shallow, broad shelf where there is extensive physical contact between bottom sediment and estuarine waters. Acid-soluble rare earth elements, the concentrations of which also dropped sharply in the low salinity region, appear to be controlled by salt-induced coagulation process and intense deposition of suspended particulate matter in the low salinity region. In the mid to high salinities, all acid-soluble rare earth element concentrations increase slightly with increasing salinity, suggesting that resuspension of sediments occurred. In contrast, the residual rare earth element concentrations are relatively constant with salinity variation in the Changjiang estuarine surface waters.
机译:利用ICP-MS测定了长江口地表水中溶解相,酸溶相和残留相中的稀土元素浓度。这项研究的主要目的是了解稀土元素的河口地球化学,并探讨长江口混合区的水-颗粒相互作用。结果表明,河口中有两种不同的作用于溶解稀土元素的过程:由于盐诱导的凝结,在低盐度下大规模去除,而在中高盐度下显着释放。这些过程导致有效河水通量的改变和向东海的溶解稀土元素的系统分馏。长江口中至高盐度水中溶解稀土元素浓度的增加表明,河口混合区的沉积物源位于浅而宽的陆架上,底部沉积物之间存在广泛的物理接触和河口水域。酸溶稀土元素的浓度在低盐度区域也急剧下降,似乎受盐诱导的凝结过程和低盐度区域中悬浮颗粒物的强烈沉积的控制。在中至高盐度下,所有酸溶性稀土元素的浓度随盐度的增加而略有增加,这表明发生了沉积物的重悬。相反,长江口地表水中的剩余稀土元素浓度随盐度变化而相对恒定。

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