Document Detail

Arsenic sequestration by ferric iron plaque on cattail roots.
MedLine Citation:
PMID:  15573609     Owner:  NLM     Status:  MEDLINE    
Typha latifolia (cattail) sequesters arsenic within predominantlyferric iron root coatings, thus decreasing mobility of this toxic element in wetland sediments. Element-specific XRF microtomographic imaging illustrated a high spatial correlation between iron and arsenic in root plaques, with little arsenic in the interior of the roots. XANES analyses demonstrated that the plaque was predominantly ferric iron and contained approximately 20% As(III) and 80% As(V), which is significant because the two oxidation states form species that differ in toxicity and mobility. For the first time, spatial distribution maps of As oxidation states were developed, indicating that As(III) and As(V) are both fairly heterogeneous throughoutthe plaque. Chemical extractions showed that As was strongly adsorbed in the plaque rather than coprecipitated. Iron and arsenic concentrations ranged from 0.03 to 0.8 g Fe g(-1) wet plaque and 30 to 1200 microg As g(-1) wet plaque, consistent with a mechanism of As adsorption onto Fe(III) oxyhydroxide plaque. Because this mechanism decreases the concentrations of both As(III) and As(V) in groundwater, we propose that disruption of vegetation could increase the concentrations of mobile arsenic.
Nicole Keon Blute; Daniel J Brabander; Harold F Hemond; Stephen R Sutton; Matthew G Newville; Mark L Rivers
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  38     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-12-02     Completed Date:  2005-06-16     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6074-7     Citation Subset:  IM    
Ralph M. Parsons Laboratory, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
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MeSH Terms
Arsenic / chemistry*,  metabolism
Chemical Precipitation
Iron / chemistry*
Plant Roots / chemistry*,  metabolism
Typhaceae / chemistry*,  metabolism
Water Pollutants, Chemical / analysis*
Grant Support
Reg. No./Substance:
0/Water Pollutants, Chemical; 7439-89-6/Iron; 7440-38-2/Arsenic

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