Trace elements and lead isotopic composition of PM10 in Lhasa, Tibet
Trace elements and lead isotopic composition of PM10 in Lhasa, Tibet
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西藏拉萨PM10微量元素及铅同位素组成
DOI：
10.1016/j.atmosenv.2011.07.060
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发表时间：
2011-11-01
影响因子：
5
通讯作者：
Li, Xiangdong
中科院分区：
文献类型：
--
作者：
Cong, Zhiyuan;Kang, Shichang;Li, Xiangdong
本文首次对青藏高原最大城市拉萨市空气中微量金属元素及其主要来源进行了详细调查。2007年9月至2008年8月期间收集了全年PM10样本。拉萨市PM10年均浓度为51.8 ± 42.5 μ g m（-3），低于亚洲主要城市。PM10浓度存在明显的季节变化，冬季浓度较高，夏季浓度较低。平均元素浓度一般与其他城市地区相当，但显著高于TP中偏远站点的平均元素浓度（即，Nam Co）。地壳元素Na、Mg、Al、K、Ca、Sc、Ti、V、Mn、Fe、As和Ba在PM10中具有相似的季节变化特征，而Cr、Co、Ni、Cu、Zn和Cd的季节变化不明显，表明后者的人为输入较多。微量元素的主成分分析（PCA）结果表明，扬尘、交通排放和垃圾焚烧活动可能是拉萨市大气中人为重金属的主要来源。铅同位素组成分析表明，铅主要来源于自然背景，水泥厂的贡献较小。本研究所获得的数据可用于制定城市污染控制策略，也有价值的其他环境介质，如雪，冰芯，和TP地区的湖泊沉积物中的微量元素的研究。(C)2011爱思唯尔有限公司保留所有权利。
This paper presents the first detailed investigation on airborne trace metals and their potential major sources at Lhasa, the largest city in Tibetan Plateau (TP). The whole year PM10 samples were collected during September 2007 and August 2008. The annual average concentration of PM10 in Lhasa was 51.8 +/- 42.5 mu g m(-3), lower than those of major Asian cities. Distinct seasonal patterns were observed in PM10 concentration, with higher concentrations in winter, and lower in summer. The mean elemental concentrations were generally comparable with other urban areas, but significantly higher than those from a remote site in TP (i.e., Nam Co). Crustal elements, including Na, Mg, Al, K, Ca, Sc, Ti, V. Mn, Fe, As and Ba, had similar seasonal patterns in PM10, while other elements, such as Cr, Co, Ni, Cu, Zn, and Cd, had less distinct seasonal variations, suggesting more anthropogenic inputs of the latter group. The result of principle component analysis (PCA) on trace elements demonstrated that fugitive dusts, traffic emissions and waste incineration activities were probably the major sources of anthropogenic metals in the atmosphere at Lhasa. The Pb isotopic compositions revealed that the metal was mainly originated from nature background with a minor contribution from the cement factory. The data obtained in this study can be useful for making pollution control strategies in the city, and also valuable for trace element studies in other environmental medium, such as snow, ice core, and lake sediments in the TP region. (C) 2011 Elsevier Ltd. All rights reserved.