title: EXAFS study on arsenic species and transformation in arsenic hyperaccumulator.
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.
authors.affiliation: Laboratory of Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Zechun
authors.initials: Z
authors.lastname: Huang
authors.forename: Tongbin
authors.initials: T
authors.lastname: Chen
authors.forename: Mei
authors.initials: M
authors.lastname: Lei
authors.forename: Tiandou
authors.initials: T
authors.lastname: Hu
authors.forename: Qifei
authors.initials: Q
authors.lastname: Huang
mesh_terms: D015502:Absorptiometry, Photon / Q000379:methods; D001151:Arsenic / Q000032:analysis*; D002681:China; D018525:Germination; D005978:Glutathione / Q000378:metabolism; D032495:Pteris / Q000737:chemistry* / Q000502:physiology
chemical_list: D005978:Glutathione; D001151:Arsenic