珠穆朗玛峰地区雪冰中重金属浓度与季节变化
收稿日期: 2006-09-01
修回日期: 2006-10-18
网络出版日期: 2007-01-25
基金资助
中科院知识创新工程重要项目(KZCX3-SW-344); 国家自然科学基金项目(40501015)
Heavy Metals Concentrations and Seasonal Variations in Snow of Mount Qomolangma Region
Received date: 2006-09-01
Revised date: 2006-10-18
Online published: 2007-01-25
Supported by
Knowledge Innovation Project of CAS, No.KZCX3-SW-344; National Natural Science Foundation of China, No.40501014
对2005 年9 月采自珠穆朗玛峰北坡海拔6523 m 的东绒布冰川积累区一批雪坑样品中重金属Ba, Co, Cu, Zn 和Pb 的浓度利用电感耦合等离子体质谱仪进行了测试, 重金属浓度范围分别为(pg/ml); Ba2~227、Co2.8~15.7、Cu 10~120、Zn29~4948、Pb14~142。并利用气体稳 定同位素质谱仪MAT-252 对样品稳定氧同位素比率(δ18O) 进行了测试, 雪坑样品对应的时间为2004 年夏到2005 年秋, δ18O和重金属元素的浓度都存在着季节变化特征。在夏季风期间δ18O 值和重金属元素的浓度都很低,而在非夏季风期间δ18O值和重金属元素浓度升高,反映了不同的水汽来源对重金属浓度季节变化的影响及其环境意义。Co, Cu, Pb, Zn 的地壳富集系数(EFc) 分别为: 3.6、27、33、180, 表明该地区Pb, Cu, Zn 已经受到了人类活动的污染, 其中Zn 受到的污染最大。
段建平, 任贾文, 秦翔, 李月芳 . 珠穆朗玛峰地区雪冰中重金属浓度与季节变化[J]. 地理学报, 2007 , 62(1) : 22 -29 . DOI: 10.11821/xb200701003
The concentrations of heavy metals Ba, Pb, Cu, Zn and Co in snow pit collected in September, 2005 from the accumulation area of the East Ronbuk Glacier (a.s.l. 6523 m), which lies on the northern slope of Mt Qomolangma, were determined by inductively coupled plasma mass spectrometry (ICP-MS), concentrations (pg/ml) of heavy metals vary from Ba2-227, Co2.8-15.7, Cu10-120, Zn29-4948, and Pb14-142, respectively. And δ18O determined by MAT-252, the time period of the snow pit spanning from autumn 2005 to summer 2004. Seasonal variations of the concentrations and δ18O are observed, of which Pb, Cu, Zn and Co are much lower in summer monsoon season than that in non summer monsoon season, suggesting that different sources of heavy metals contributed to the site. EFc (crustal enrichment factors) is Co 3.6, Cu 27, Pb 33 and Zn 180, respectively. Higher EFc values of Pb, Cu and Zn suggest that Pb, Cu especially Zn mainly contributed by anthropogenic sources.
Key words： heavy metals; concentration; seasonal variations; Mount Qomolangma region
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