托素湖沉积物中重金属元素分析及地球化学特征研究

Analysis of Heavy Metals Elementals and Geochemical Study in the Sediments from Toson Lake

中文关键词:  托素湖  重金属元素  污染程度  地球化学特征

英文关键词:Toson lake  heavy metals  the degree of pollution  geochemical characteristics

中文摘要:

      首次对托素湖沉积岩芯上部沉积物的重金属元素Cr、Cd、Cu、Zn和Pb的含量进行分析测试。精确测得沉积物中Cr，Cd，Cu，Zn和Pb的平均浓度分别为32.9 mg.kg-1，2.2 mg.kg-1，19.5 mg.kg-1，188.5 mg.kg-1和32.3 mg.kg-1。与区域背景值和标准值相比，托素湖沉积物样品中Cd和Zn都偏高。研究结果表明除了Cd污染程度比较严重，托素湖当前的Cr、Cu、Zn和Pb污染程度相对较轻。各元素经Ti校正后的分析结果显示，重金属元素含量在沉积剖面的10cm处出现波动性增大的明显转折，表明托素湖沉积物中Cd、Cr、Cu、Zn和Pb主要来源于流域侵蚀的造岩矿物元素，Cd污染可能源于人类活动所致。 关键词：托素湖；重金属元素；污染程度；地球化学特征

英文摘要:

      For the first time, the content of heavy metal element Cr, Cd, Cu, Zn and Pb is tested in the upper lake sediment of Toson Lake. It has been determined that the average concentrations of Cr, Cd, Cu, Zn, and Pb in the sediments are respectively 32.9 mg.kg-1，2.2 mg.kg-1，19.5mg.kg-1，188.5 mg.kg-1and 32.3 mg.kg-1. Compared with the regional background values and values, Cd and Zn concentrations in the sediments are relatively higher. The results show that in addition to the Cd pollution seriously, the Toson Lake sediments are polluted slightly by Cr, Cu, Zn and Pb. Through the analysis of the elements after Ti correction results show that the contents of heavy metal elements apparently turn increased volatility in 10cm sedimentary section. It indicates that Cr, Cu, Zn and Pb in Toson Lake mainly come from the watershed of elements in rocks and minerals made and Cd pollution could be attributed to human activities.