Adsorption experiment of water-soluble rare earth elements in atmospheric depositions and implications for source tracin
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ORIGINAL ARTICLE
Adsorption experiment of water-soluble rare earth elements in atmospheric depositions and implications for source tracing in South China Xiaojian Mi1,2 • Yuan Li1 • Yuefeng Liu1 • Yu Xie1 • Hanjie Li1 • Xiaotao Peng1 Houyun Zhou1
•
Received: 27 May 2020 / Revised: 21 July 2020 / Accepted: 11 October 2020 Ó Science Press and Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The distribution patterns of rare earth elements (REEs) in fine-grained materials in various depositions were often found to be similar to those of the aeolian sediments deposited in the Loess Plateau in North China and the fine-grained materials were suggested to be derived from wind-blown dust. However, increasing evidence indicated that the REEs in the water-soluble portion of atmospheric depositions also displayed similar patterns to those of aeolian sediments. In this study, water-soluble REEs in three atmospheric depositions collected from different climatic zones in China were adsorbed with two adsorbents with distinct adsorption capacity, glass powder, and co-precipitated iron hydroxide. The results showed that
the REEs adsorbed by the two adsorbents displayed patterns similar to those of the original atmospheric depositions. The typical characteristics of the REE patterns of atmospheric deposition can be well reproduced in the adsorbed REEs. The higher the REE concentrations in the atmospheric depositions, or the higher adsorption efficiency of the adsorbents, the better reproducibility of the REEs patterns. The results suggest that the REEs of the fine-grained materials in various sediments, which have a high adsorption capacity, especially those deposited in South China, may come from the water-soluble REEs in atmospheric deposition, and may not be appropriate tracers of wind-blown dust from North China.
Xiaojian Mi and Yuan Li have contributed the same to the paper.
Keywords Atmospheric deposition Rare earth element Adsorption experiment Source tracing Fine-grained material
& Xiaotao Peng [email protected] & Houyun Zhou [email protected] Xiaojian Mi [email protected] Yuan Li [email protected] Yuefeng Liu [email protected] Yu Xie [email protected] Hanjie Li [email protected] 1
School of Geography, South China Normal University, Guangzhou 510631, China
2
Department of Geography, Lingnan Normal University, Zhanjiang 524048, China
1 Introduction Rare Earth Elements (REEs) are a group of elements with relatively stable geochemical properties and are often used for tracer studies of sediment sources (Kitto et al. 1992; Sholkovitz et al. 1993; Nozaki et al. 2000; Wang et al. 2001; Cai et al. 2010; Pearce et al. 2013; Haley et al. 2004; Yang and Li 1999, Yang et al. 2002; Singh 2009). Some studies have shown that the REE distribution patterns of the fine-grained portion in surface sediments (including weathered residuals) are mostly similar, and are consistent with the REE distribution patterns of the upper crust (UCC) and the dust deposits in n
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