Adsorption experiment of water-soluble rare earth elements in atmospheric depositions and implications for source tracing in South China  

作　　者：Xiaojian Mi Yuan Li Yuefeng Liu Yu Xie Hanjie Li Xiaotao Peng Houyun Zhou 

机构地区：[1]School of Geography,South China Normal University,Guangzhou 510631,China [2]Department of Geography,Lingnan Normal University,Zhanjiang 524048,China

出　　处：《Acta Geochimica》2021年第2期225-233,共9页地球化学学报（英文）

基　　金：financially supported by the National Natural Science Foundation of China (Grant Nos. 41473093 and 41271212)。

摘　　要：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.

关 键 词：Atmospheric deposition Rare earth element Adsorption experiment Source tracing Fine-grained material 

分 类 号：P512.2[天文地球—地质学] P595