东昆仑山玉珠峰冰川雪坑中痕量元素的组成特征  

Characteristics of Trace Element Composition in Snow-Pits of Yuzhufeng Glacier Eastern Kunlun Mountains

作　　者：李月芳[1] 王宁练[1] 姚檀栋[1] 蒲健辰[1] 时晓兰[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室,兰州730000

出　　处：《冰川冻土》2011年第4期752-759,共8页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40771046);国家自然科学基金重点项目(40930526);全球变化研究国家重大科学研究计划项目(2010CB951404)资助

摘　　要：为了认识玉珠峰冰川区域大气中痕量元素的组成和来源,利用高分辨电感耦合等离子体质谱仪对2009年10月采自玉珠峰冰川海拔5 800 m的一个75 cm雪坑中15种可溶性痕量元素(Al、Fe、Ba、Cd、Co、Cr、Cu、Li、Ni、Zn、Pb、Sb、Sr、U和V)的浓度进行了测试.结果表明:痕量元素的浓度变化很大,从最小值1.2 pg.g-1(U)到最大值293 ng.g-1(Fe),痕量元素浓度的最大值和最小值之比在7(Sb)到358(Li)之间.对痕量元素的地壳富集系数分析表明,除粉尘外,Cd、Sb、Zn、Pb和Cu还存在其他来源的重要贡献.与青藏高原其他地区雪冰中痕量元素对比表明,本区的痕量元素的浓度低于天山和慕士塔格峰冰川的浓度,部分痕量元素也低于东绒布冰川雪冰中的浓度,揭示了玉珠峰区域大气中较低的大气痕量元素背景值.尽管如此,本区的所有痕量元素浓度依然远高于格陵兰和南极雪冰中的相应浓度.Abstract： In order to understand the composition and sources of the trace elements in the atmosphere over Yuzhufeng Glacier, using the high resolution inductively coupled plasma mass spectrometry, concentrations of the fifteen dissolubility trace elements, i. e. , A1, Fe, Ba, Cd, Co, Cr, Cu, Li, Ni, Zn, Pb, Sb, Sr, U and V, were determined. The samples were collected from a 75-cm snow-pit on the elevation of 5800 m in Yuzhufeng Glacier in October 2009. The analyses indicate that the concentrations of the trace elements have the prodi- gious change, from the minimum of 1. 2 pg · g-1 （U） to the maximum of 293 ng· g-1 （Fe）; the ratios of Max/Min are between 7（Sd） and 358（Li）. Comparing with the concentrations of trace elements in other regions of the Tibetan Plateau shows that the concentrations of trace elements are lower than those in the Tianshan Mountains and Muztagh Ata, and partly lower than those in East Rongbuk Glacier. It is revealed that the back- ground value in the atmosphere over the Yuzhufeng Glacier is low. However, all the concentrations of trace elements are much higher than those in Greenland and Antarctica.

关 键 词：痕量元素 粉尘 人为污染 玉珠峰冰川 

分 类 号：P343.6[天文地球—水文科学]