Dissolved rare earth elements in river waters draining karst terrains in Guizhou Province,China |
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Authors: | Guilin Han Cong-Qiang Liu |
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Institution: | (1) The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou, 550002, China |
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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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Keywords: | Karst Water chemistry River water Dissolved load REE |
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