Document Detail


Silicate mineral impacts on the uptake and storage of arsenic and plant nutrients in rice (<i> Oryza sativa </i> L.) <i>
MedLine Citation:
PMID:  23153302     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Arsenic-contaminated rice grain may threaten human health globally. Since H<sub>3</sub>AsO<sub>3</sub><sup>0</sup> is the predominant As species found in paddy pore waters, and H<sub>3</sub>AsO<sub>3</sub><sup>0</sup> and H<sub>4</sub>SiO<sub>4</sub><sup>0</sup> share an uptake pathway, Si amendments have been proposed to decrease As uptake and consequent As concentrations in grains. Here, we evaluated the impact of two silicate mineral additions differing in solubility (+Si<sub>L</sub>, diatomaceous earth, 0.29 mM Si; +Si<sub>H</sub>, Si-gel, 1.1 mM Si) to soils differing in mineralogy on arsenic concentration in rice. The +Si<sub>L</sub> addition either did not change or decreased As concentration in pore-water but increased or did not change grain-As levels relative to the (+As -Si) control. The +Si<sub>H</sub> addition increased As in pore-water, but significantly decreased grain As relative to the (+As -Si) control. Total grain- and straw-As was negatively correlated with pore-water Si, and the relationship differed between two soils exhibiting different mineralogy. These differing results are a consequence of competition between H<sub>4</sub>SiO<sub>4</sub><sup>0</sup> and H<sub>3</sub>AsO<sub>3</sub><sup>0</sup> for adsorption sites on soil solids and subsequent plant uptake, and illustrate the importance of Si mineralogy on arsenic uptake.
Authors:
Angelia Seyfferth; Scott Fendorf
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-16
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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