Localization and Speciation of Arsenic in Soil and Desert Plant Parkinsonia florida Using [mu]XRF and [mu]XANES

Parkinsonia florida is a plant species native to the semidesert regions of North America. The cultivation characteristics of this shrub/tree suggest that it could be used for phytoremediation purposes in semiarid regions. This work describes, through the use of synchrotron ...XRF and ...XANES techni...

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Bibliographic Details
Published inEnvironmental science & technology Vol. 45; no. 18; p. 7848
Main Authors Castillo-Michel, Hiram, Hernandez-Viezcas, Jose, Dokken, Kenneth M, Marcus, Matthew A, Peralta-Videa, Jose R, Gardea-Torresdey, Jorge L
Format Journal Article
LanguageEnglish
Published Easton American Chemical Society 15.09.2011
Subjects
Arid zones
Arsenic
Arsenic content
Bioremediation
Flowers & plants
Soil contamination
Spectrum analysis
North America
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Summary:Parkinsonia florida is a plant species native to the semidesert regions of North America. The cultivation characteristics of this shrub/tree suggest that it could be used for phytoremediation purposes in semiarid regions. This work describes, through the use of synchrotron ...XRF and ...XANES techniques and ICP-OES, the arsenic (As) accumulation and distribution in P. florida plants grown in two soils spiked with As at 20 mg kg... Plants grown in a sandy soil accumulated at least twice more As in the roots compared to plants grown in a loamy soil. The lower As accumulation in plants grown in the loamy soil corresponded to a lower concentration of As in the water-soluble fraction (WSF) of this soil. LC-ICP-MS speciation analysis showed only As(V) in the WSF from all treatments. In contrast, linear combination XANES speciation analysis from the root tissues showed As mainly present in the reduced As(III) form. Moreover, a fraction of the reduced As was found coordinating to S in a form consistent with As-Cys... The percentage of As coordinated to sulfur was smaller for plants grown in the loamy soil when compared to the sandy soil. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0013-936X