DOI: 10.1007/s10533-014-0018-7
Scopus记录号: 2-s2.0-84911806544
论文题名: Spectroscopic (XANES/XRF) characterization of contaminant manganese cycling in a temperate watershed
作者: Herndon E.M. ; Martínez C.E. ; Brantley S.L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 3 起始页码: 505
结束页码: 517
语种: 英语
英文关键词: Critical zone
; Manganese
; Metal contamination
; Soil geochemistry
; Spectroscopy
Scopus关键词: atmospheric deposition
; decomposition
; human activity
; land surface
; manganese
; observatory
; pollutant
; soil pollution
; spatial distribution
; temperate environment
; watershed
; X-ray fluorescence
; XANES spectroscopy
; Pennsylvania
; United States
英文摘要: Many soils around the globe are contaminated with metals due to inputs from anthropogenic activities; however, the long-term processes that retain these metals in soils or flush them into river systems remain unclear. Soils at the Susquehanna/Shale Hills Critical Zone Observatory, a headwater catchment in central Pennsylvania, USA, are enriched in manganese due to past atmospheric deposition from industrial sources. To investigate how Mn is retained in the catchment, we evaluated the spatial distribution and speciation of Mn in the soil–plant system using X-ray fluorescence and X-ray Absorption Near Edge Structure spectroscopies. Weathered soils near the land surface were enriched in both amorphous and crystalline Mn(III/IV)-oxides, presumably derived from biogenic precipitation and atmospheric deposition, respectively. In contrast, mineral soils near the soil–bedrock interface contained Mn(II) in clays and crystalline Mn(III/IV)-oxides that formed as Mn(II) was leached from the parent shale and oxidized. Roots, stems, and foliar tissue were dominated by organic-bound and aqueous Mn(II); however, a small portion of foliar Mn was concentrated as organic-bound Mn(III) in dark spots that denote Mn toxicity. During decomposition of leaves and roots, soluble Mn(II) stored in vegetation was rapidly oxidized and immobilized as mixed-valence Mn-oxides. We propose that considerable uptake of Mn by certain plant species combined with rapid oxidation of Mn during organic matter decomposition contributes to long-term retention in soils and may slow removal of Mn contamination from watersheds. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83632
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Geosciences, The Pennsylvania State Univeristy, University Park, PA, United States; Department of Crop and Soil Sciences, Cornell University, Ithaca, NY, United States; Department of Geology, Kent State University, Kent, OH, United States
Recommended Citation:
Herndon E.M.,Martínez C.E.,Brantley S.L.. Spectroscopic (XANES/XRF) characterization of contaminant manganese cycling in a temperate watershed[J]. Biogeochemistry,2014-01-01,121(3)