Uptake, Distribution, and Speciation of Chromium in Brassica Juncea

Journal Article · Mon Jun 09 04:00:00 EDT 2008 · Int. J. Phytoremediat.

OSTI ID:1008560

Bluskov, S; Arocena, J M; Omotoso, O O; Young, J P ^[1]

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1. CANMET

Brassica juncea (Indian mustard) has been widely used in phytoremediation because of its capacity to accumulate high levels of chromium (Cr) and other metals. The present study was conducted to investigate mechanism(s) involved in Cr binding and sequestration by B. juncea. The plants were grown under greenhouse conditions in field-moist or air-dried soils, amended with 100 mg kg{sup -1} of Cr (III or VI). The plant concentrated Cr mainly in the roots. B. juncea removed an average of 48 and 58 {micro}g Cr per plant from Cr (III) and Cr (VI)-treated soils, respectively. The uptake of Cr was not affected by the moisture status of the soils. X-ray absorption near-edge spectroscopy measurements showed only Cr (III) bound predominantly to formate and acetate ligands, in the bulk and rhizosphere soils, respectively. In the plant tissues, Cr (III) was detected, primarily as acetate in the roots and oxalate in the leaves. X-ray microprobe showed the sites of Cr localization, and probably sequestration, in epidermal and cortical cells in the roots and epidermal and spongy mesophyll cells in the leaves. These findings demonstrate the ability of B. juncea to detoxify more toxic Cr (VI), thereby making this plant a potential candidate for phytostabilization.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1008560
• Journal Information: Int. J. Phytoremediat., Journal Name: Int. J. Phytoremediat. Journal Issue: (2) ; 2005 Vol. 7; ISSN 1522-6514
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

54 ENVIRONMENTAL SCIENCES
ABSORPTION
ACETATES
BRASSICA
CAPACITY
CHROMIUM
DISTRIBUTION
FORMATES
GREENHOUSES
MOISTURE
OXALATES
PLANT TISSUES
SOILS
SPECTROSCOPY