Distributions of dissolved rare earth elements during estuarine mixing at the Changjiang River mouth |
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Authors: | Zhongliang Wang Congqiang Liu |
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Institution: | (1) State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China |
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Abstract: | The first data on the concentrations of dissolved REE in surface waters collected from the north passage of the Changjiang
Estuary where the salinity ranges from 0.15 to 19 mglg were determined by ICP-MS after preconcentration with solvent extraction
and back-extraction techniques. Relative to other estuaries, the river-water end-member concentrations of dissolved REE are
very low, ranging from 11.963 (Y) to 0.098 ng/kg (Lu). Dissolved REE removed markedly from water in the Changjiang Estuary
where salinity lies within the range of 0.15-1 mg/g, but the percent removal is low, ranging only from 47%(La) to 25%(Lu).
Strong water-sediment interaction due to shallow water depth in the Changjiang Estuary leads to remarkable concentration peaks
of dissolved REE in the location where the salinity varies from 1 to 8 mg/g. In the moderate and high salinity regions from
8 to 19 mg/g, the concentrations of dissolved REE gradually increase as a result of desorption or partial dissolution of particles. |
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Keywords: | Changjiang Estuary rare earth elements distributions removal desorption |
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