EXAFS study on arsenic species and transformation in arsenic hyperaccumulator |
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Authors: | Zechun?Huang Email author" target="_blank">Tongbin?ChenEmail author Mei?Lei Tiandou?Hu Qifei?Huang |
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Institution: | 1.Laboratory of Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,China;2.PLaboratory of Synchrotron Radiation, Institute of High Energy Physics,Chinese Academy of Sciences,Beijing,China |
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Abstract: | Synchrotron radiation extended X-ray absorption fine structure (SR EXAFS) was employed to study the transformation of coordination
environment and the redox speciation of arsenic in a newly discovered arsenic hyperaccumulator, Cretan brake (Pteris cretica L. var nervosa Thunb). It showed that the arsenic in the plant mainly coordinated with oxygen, except that some arsenic coordinated with
S as As-GSH in root. The complexation of arsenic with GSH might not be the predominant detoxification mechanism in Cretan
brake. Although some arsenic in root presented as As(V) in Na2HAsO4 treatments, most of arsenic in plant presented as As(III)-O in both treatments, indicating that As(V) tended to be reduced
to As(III) after it was taken up into the root, and arsenic was kept as As(III) when it was transported to the above-ground
tissues. The reduction of As(V) primarily proceeded in the root. |
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Keywords: | hyperaccumulator Cretan brake (Pteris cretica L var nervosa Thunb) arsenic species EXAFS |
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