State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
Chemosphere. 2018 Jun;200:523-531. doi: 10.1016/j.chemosphere.2018.01.039. Epub 2018 Feb 23.
In order to extract pollution signal of trace elements (TEs) in glacier snow at the Qinghai-Tibetan plateau of China by human activities, concentrations of 18 TEs (Al, Ti, Fe, Rb, Sr, Ba, V, Cr, Mn, Li, Cu, Co, Mo, Cs, Sb, Pb, Tl, and U), 14 rare earth elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), Y and Th in digested snow samples from five glaciers in April-May 2013 before monsoon season were measured. Results shown that higher TEs concentrations were found in glaciers at the northern plateau while lower concentrations in glaciers at the central and southern plateau. Discussion revealed that EF values calculated from elements with mass fraction <30% such as Ti and Al, etc in traditional acid leached samples, will overestimate at least 4.6 times the contribution of other sources than dust for TEs such as Sb, Sr, As, Cu and Pb etc. Analysis indicated that most TEs mainly originated from dust sources, whereas Pb, Cu, Mo and Sb showed occasionally significant contributions from polluted sources in three snow pits and the GRHK surface snow samples. The pollution probably originated from mining and smelting, road transport emissions on the plateau and some regions outside of the plateau. Dust provenance tracing results based on REEs indicated that Taklimakan Desert, Qaidam Basin, and Tibetan surface soil were the potential dust sources for the studied glaciers, while the Indian Thar Desert was an occasional dust sources for YZF,XDKMD and GRHK snow samples.
为了从青藏高原中国的冰川雪中提取人类活动引起的微量元素（TEs）的污染信号，在季风季节前的 2013 年 4 月至 5 月，测量了消化后雪样中 18 种 TEs（Al、Ti、Fe、Rb、Sr、Ba、V、Cr、Mn、Li、Cu、Co、Mo、Cs、Sb、Pb、Tl 和 U）、14 种稀土元素（La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb 和 Lu）、Y 和 Th 的浓度。结果表明，高原北部的冰川中 TEs 浓度较高，而高原中部和南部的冰川中浓度较低。讨论表明，传统酸浸样品中质量分数小于 30%的元素（如 Ti 和 Al 等）计算出的 EF 值，将使 Sb、Sr、As、Cu 和 Pb 等 TEs 的其他来源（除灰尘外）的贡献至少高估 4.6 倍。分析表明，大多数 TEs 主要来源于灰尘源，而 Pb、Cu、Mo 和 Sb 在三个雪坑和 GRHK 表面雪样中偶尔显示出来自污染源的显著贡献。污染可能来自高原上的采矿和冶炼、道路交通排放以及高原外的一些地区。基于 REE 的尘埃源示踪结果表明，塔克拉玛干沙漠、柴达木盆地和西藏地表土壤是研究冰川的潜在尘埃源，而印度塔尔沙漠是 YZF、XDKMD 和 GRHK 雪样的偶然尘埃源。
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