Heavy metals and rare earth elements (REEs) in soil from the Nam Co Basin,Tibetan Plateau |
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| Authors: | Chaoliu Li Shichang Kang Xiaoping Wang F Ajmone-Marsan Qianggong Zhang |
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| Institution: | (1) Institute of Tibetan Plateau Research, CAS, Beijing, 100085, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China;(3) Key Laboratory of Cryosphere and Environment, CAS, Lanzhou, 730000, China;(4) Università di Torino, DIVAPRA–Chimica agraria, Via L. Da Vinci, 44 10095 Grugliasco (Torino), Italy |
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| Abstract: | Twenty-eight soil samples collected from the Nam Co Basin, Tibetan Plateau, have been analyzed for heavy metals (Cd, Cr, Ni,
Cu, Zn, Pb and Mn), arsenic (As) and rare earth elements (REEs). In addition, for establishing the basic physio-chemical characteristics
of the soil, pH, total organic concentration, electrical conductivity, and effective cation exchange capacity were measured.
The results indicate that soil in the Nam Co Basin is still at an early alkaline weathering stage (pH = 7.94). Mean concentrations
of heavy metals and As decreased as follows: Mn > Cr > Zn > Pb > Ni > Cu > As > Cd. The values of Cd, Cr, As, Pb and REEs
in soil from the Nam Co Basin are higher relative to averaged background values over China. The chondrite-normalized diagrams
of REEs suggest high REE(ΣLa → Eu)—enrichment, HREE(ΣGd → Lu)—depletion and Eu—depletion. Vertical profiles indicate that
both heavy metals (except As) and REEs primarily exist in the surface soil. However, heavy metals and REEs vary in the surface
soil between the southern and the northern bank of Nam Co. These differences are controlled mainly by parent materials. |
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| Keywords: | Heavy metals Rare earth elements Soil Nam Co Basin Tibetan Plateau |
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