Abstract
Winter seasonal concentrations of dissolved rare earth elements (REE) of two major river systems (the Wujiang River system and the Yuanjiang River system) in karst-dominated regions in winter were measured by using a method involving solvent extraction and back-extraction and subsequent ICP-MS measurements. The dissolved REE concentrations in the rivers and their tributaries are lower than those in most of the large rivers in the world. High pH and high cation (i.e., Na+ + Ca2+) concentrations of the rivers are the most important factors controlling the concentrations of dissolved REE in the river water.
The dissolved load (<0.22 μm) REE distribution patterns of high-pH river waters are very different from those of low-pH river waters. The shale (PAAS)-normalized REE patterns for the dissolved loads are characterized by light REE-enrichment and heavy REE-enrichment. Water in the upper reaches of the Wujiang River generally shows light REE-enriched patterns, while that in the middle and lower reaches generally shows heavy REE-enriched patterns. The Yuanjiang River is heavy REE enriched with respect to the light REE in the same samples. Water of the Wuyanghe River draining dolomite-dominated terrains has the highest heavy REE-enrichment. Most river water samples show the shale-normalized REE patterns with negative Ce and Eu anomalies, especially water from Wuyanghe River. Y/Ho ratios show that the water/particle interaction might have played an important role in fractionation between HREE and LREE.
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Acknowledgements
This work was supported jointly by National Basic Research Program of China (973 Program) (no. 2006CB403206), the Chinese National Natural Science Foundation (no. 40372108, 40673010).The authors gratefully acknowledge Prof. E.R. Sholkovitz and Johan Schijf for significant improvements on the manuscript.
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Han, G., Liu, CQ. Dissolved rare earth elements in river waters draining karst terrains in Guizhou Province, China. Aquat Geochem 13, 95–107 (2007). https://doi.org/10.1007/s10498-006-9009-1
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DOI: https://doi.org/10.1007/s10498-006-9009-1