Quick Search:       Advanced Search
Variations of trace elements and rare earth elements (REEs) treated by two different methods for snow-pit samples on the Qinghai-Tibetan Plateau and their implications
Received:April 25, 2017    Click here to download the full text
Citation of this paper:YueFang Li,Zhen Li,Ju Huang,Giulio Cozzi,Clara Turetta,Carlo Barbante,LongFei Xiong,2017.Variations of trace elements and rare earth elements (REEs) treated by two different methods for snow-pit samples on the Qinghai-Tibetan Plateau and their implications.Sciences in Cold and Arid Regions,9(6):568~579.
Hits: 241
Download times: 290
Author NameAffiliationE-mail
YueFang Li State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China liyf@lzb.ac.cn 
Zhen Li State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
Ju Huang State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China  
Giulio Cozzi Institute for the Dynamics of Environmental Processes, National Research Council (IDPA-CNR), University of Venice, Dorsoduro 2137, 30123 Venice, Italy  
Clara Turetta Institute for the Dynamics of Environmental Processes, National Research Council (IDPA-CNR), University of Venice, Dorsoduro 2137, 30123 Venice, Italy  
Carlo Barbante Institute for the Dynamics of Environmental Processes, National Research Council (IDPA-CNR), University of Venice, Dorsoduro 2137, 30123 Venice, Italy  
LongFei Xiong State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
 
Abstract:Although previous investigations of the trace elements in snow and ice from the Qinghai-Tibetan Plateau obtained interesting information about pollution from human activities on the plateau, most were based on traditional acidification methods. To emphasize the influence of the different sample-preparation methods on the records of trace elements and rare earth elements, snow samples were collected from glaciers on the Qinghai-Tibetan Plateau in China and prepared using two methods: traditional acidification and total digestion. Concentrations of 18 trace elements (Al, Ti, Fe, Rb, Sr, Ba, V, Cr, Mn, Li, Cu, Co, Mo, Cs, Sb, Pb, Tl, and U), along with 14 rare earth elements (REEs: La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), Y, and Th in the snow samples, were measured using inductively coupled plasma-sector field mass spectrometry (ICP-SFMS). The results showed that the mass fraction of the trace elements (defined as ratio of concentration in the acid-leachable fraction to that in the digested sample) such as Mo, Ti, Al, Rb, and V, varied from 0.06 to 0.5. The mass fraction of other trace elements varied from about 0.6 to more than 0.9; those of the REEs, Y, and Th varied from 0.34 to 0.75. Lower mass fractions will lead to an overestimated contribution of other sources, especially human activities, and the underestimated fluxes of these trace elements (especially REEs, Y, and Th, as well as dust) if the REEs are used as the proxy for the crust dust. The two sample-preparation methods exhibited different REE normalized distribution patterns, REE ratios, and provenance-tracing results. The REE normalized distribution patterns and proxies in the digested samples are more reliable and integrated than those found in traditional acidification method for dust-provenance tracing.
keywords:sample-preparation methods  trace elements  REEs  mass fraction  snow samples  Qinghai-Tibetan Plateau
HTML  View Full Text  View/Add Comment  Download reader