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首页> 外文期刊>Geochemical Journal >Rare earth element geochemistry of waters and suspended particles in alkaline lakes using extraction and sequential chemical methods
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Rare earth element geochemistry of waters and suspended particles in alkaline lakes using extraction and sequential chemical methods

机译：萃取和顺序化学法对碱性湖泊中水和悬浮颗粒的稀土元素地球化学

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摘要

The concentrations of rare earth elements in the waters and suspended particles from two alkaline lakes in a carbonate drainage basin of the South China Karst region were determined via ICP-MS. Sequential chemical extraction experiments were conducted on the suspended matter to investigate water-particle interaction processes. Due to their high pH,the alkaline lakes have lower concentrations of dissolved rare earth elements than those reported for most other terrestrial surface waters of the world. Linear regressions between pH and the rare earth element (REE) concentrations over a wide pH range show a "three stage model," implying the geochemical behavior of dissolved REEs in surface waters is mainly controlled by pH. Shale-normalized patterns of dissolved REEs mainly show a marked enrichment in heavy REEs (HREE), while acid-extracted and organic REEs mainly show convex patterns and the residual fractions have flat patterns. Distinct positive La anomalies were observed in the Lake Aha and its river waters, which also exhibit a very high Mn concentration, indicating severe redox and scavenging conditions. Both negative and positive Ce anomalies were clearly observed in the dissolved phase and extracted fractions of suspended particulate matter. The positive correlation of Ce anomalies with Mn indicates that redox reactions control these Ce anomalies.
机译：通过ICP-MS测定了华南喀斯特地区碳酸盐岩流域盆地两个碱性湖泊中水和悬浮颗粒中稀土元素的浓度。对悬浮物进行了连续的化学萃取实验，以研究水与粒子之间的相互作用过程。由于碱性湖泊的pH值高，因此其溶解的稀土元素的浓度低于世界上大多数其他陆地地表水的浓度。在宽的pH范围内，pH与稀土元素（REE）浓度之间的线性回归显示出“三个阶段模型”，这意味着地表水中溶解的REE的地球化学行为主要受pH控制。溶解稀土元素的页岩归一化模式主要表现为重稀土元素（HREE）的显着富集，而酸萃取和有机稀土元素主要表现为凸形，剩余馏分具有平坦模式。在阿哈湖及其河流水域观察到明显的正La异常，这些异常也表现出很高的Mn浓度，表明存在严重的氧化还原和清除条件。在溶解相和悬浮颗粒物的提取馏分中都清楚地观察到了Ce的负和正异常。 Ce异常与Mn的正相关表明氧化还原反应控制了这些Ce异常。

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