High-precision measurement of mercury isotope ratios of atmospheric deposition over the past 150 years recorded in a peat core taken from Hongyuan,Sichuan Province,China |
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Authors: | WenFang Shi XinBin Feng Gan Zhang LiLi Ming RunSheng Yin ZhiQi Zhao Jing Wang |
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Institution: | SHI WenFang1,2,FENG XinBin1*,ZHANG Gan3,MING LiLi2,3,YIN RunSheng1,ZHAO ZhiQi1 & WANG Jing1 1 The State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China,2 Graduate University of Chinese Academy of Sciences,Beijing 100049,3 The State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Guangzhou 510640 |
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Abstract: | High-precision 210Pb dating technology was applied to a peat core with a time span of about 150 years that was taken from Hongyuan, Sichuan
Province, China. The concentrations of total mercury (Hg) and stable isotope compositions of mercury in the peat core were
measured using a LUMEX 915 instrument and multi-collector inductively coupled plasma mass spectrometer, respectively. Total
mercury (Hg) concentrations in the peat core had a clearly increasing trend from the bottom to top of the core while δ
202Hg values (relative to NIST 3133) of peat had a decreasing trend. The total mercury (Hg) concentration varied from 16.7 to
101.3 ng/g and the δ
202Hg values ranged from ?0.44‰ ± 0.14‰ to ?1.45‰ ± 0.22‰. We clearly show that the study area experienced mercury pollution
after the industrial revolution, and the mercury emitted from natural sources and anthropogenic sources had different Hg isotope
signatures. |
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Keywords: | peat ombrotrophic mercury isotope industrialization |
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