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
10.11895/j.issn.0253-3820.170230
- VernacularTitle:微束X射线荧光和X射线吸收近边结构谱分析云南某铅锌矿区苔藓中铅的分布和形态
- Author:
Yufang SONG
;
Yating SHEN
- Keywords:
Moss;
Lead-zinc mine;
Lead;
Phytoremediation;
Micro-X-ray fluorescence;
X-ray absorption near edge structure;
Micro-distribution;
Speciation
- From:Chinese Journal of Analytical Chemistry
2017;45(9):1309-1315
- CountryChina
- Language:Chinese
-
Abstract:
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.
