Sediment records of Sb and Pb stable isotopic ratios in Lake Qinghai |
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Authors: | Libin Xu Jian Zheng Huixian Li Xiaoli Zhao |
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Affiliation: | a State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China b Nakaminato Laboratory for Marine Radioecology, Environmental Radiation Effects Research Group, National Institute of Radiological Sciences, Hitachinaka, Ibaraki, 311-1202, Japan c Worsfold Water Quality Centre, Trent University, Peterborough, ON, Canada K9H 7B8 |
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Abstract: | A sediment core in Lake Qinghai in northwest China was collected in 2006. 137Cs and 210Pb activities were analyzed to investigate the chronology of the sediment core. Sb and Pb concentrations, and Pb stable isotopic ratios were analyzed to study the historical atmospheric deposition records and sources of Sb over the past 15 centuries. The Sb concentration was 4.21 ± 1.52 μg/g in the sediments, its vertical distribution of Sb shows three large peaks in the recent two centuries, 1799, 1896 and 1944, coincided with Sb contamination from large wars, respectively. The peak in 1920 responded the large earthquake that happened in northern China, which was not far away from Lake Qinghai. The Sb/Pb ratio, 206Pb/207Pb and 208Pb/206Pb results suggest that Sb and Pb were probably from the ores in South China and coals in North China before 1965, but obviously from uses of leaded gasoline after 1965. |
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Keywords: | Antimony Sediment Lake Qinghai Pb isotopic ratios |
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