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Citation: SONG Yu-Fang, SHEN Ya-Ting. Distribution and Speciation of Lead in Moss Collected from a Lead-Zinc Mining Area by Micro-X-Ray Fluorescence and X-Ray Absorption Near Edge Structure Analysis[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(9): 1309-1315. doi: 10.11895/j.issn.0253-3820.170230 shu

Distribution and Speciation of Lead in Moss Collected from a Lead-Zinc Mining Area by Micro-X-Ray Fluorescence and X-Ray Absorption Near Edge Structure Analysis

SONG Yu-Fang ^1,2, ,
SHEN Ya-Ting ^1,3

1.
National Research Center for Geoanalysis, Beijing 100037, China;2 China University of Geosciences(Wuhan) Faculty of Materials Science and Chemistry, Wuhan 100083, China;3 Key Laboratory of Ecological Geochemistry, Ministry of Land and Resources, Beijing 100037, China

Received Date: 13 April 2017
Revised Date: 12 June 2017

Fund Project: This work was supported by the National Key Research and Development Program of China (No. 2016YFC0600603), the National High Technology Research and Development Program of China (No. 2007AA06Z124), the China Geological Survey Projects(No.DD20160340) and the Fundamental Research Funds for the Chinese Academy of Geologecal Sciences (No.YYWF201620)

Moss has high tolerance and accumulating capacity to heavy metal. In this study, the distribution of heavy metal elements in moss sampled from lead-zinc mine was analyzed by X-ray fluorescence spectrometry. The speciation of lead was analyzed by X-ray absorption near-edge spectroscopy. Research showed that the contents of Pb, Zn, Cd and As in the moss of the mining area were extremely high, and their maximum concentration were 1.06 mg/g, 1.23 mg/g, 30.5 μg/g, 13.2 μg/g, respectively. Besides, the shoots especially the new tissue of the moss were the major sites for accumulation and storage of heavy metals. The micro-distribution characteristics varied among Hypnum plumaeforme and Brachytheciumprocumbens, indicating the difference of different species of moss in absorption pathway, accumulation and tolerance mechanisms for heavy metal. Linear combination fitting results indicated that the main lead speciation in moss was lead phosphate (78%) and lead oxide (22%), which suggested that the precipitation of lead phosphate might be the main mechanism of tolerance for moss.
- Moss,
- Lead-zinc mine,
- Lead,
- Phytoremediation,
- Micro-X-ray fluorescence,
- X-ray absorption near edge structure,
- Micro-distribution,
- Speciation
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