title: Phytoremediation potential of Pteris vittata L. under the combined contamination of As and Pb: beneficial interaction between As and Pb.
abstract: The frequent co-existence of arsenic (As) and lead (Pb) necessitates the investigation of clean-up technologies for multi-metal(loid)s. Field survey and hydroponic experiments were conducted to elucidate the co-accumulation of As and Pb in Pteris vittata L. The P. vittata population isolated from a Pb-Zn mine in Yunnan province, China is a potential extractor of As and Pb co-contamination. Hydroponic experiment found that the highest frond As and Pb concentrations in mining population of P. vittata reached 12.2 and 0.99 g kg(-1), respectively. The interaction between As and Pb in P. vittata was further more disclosed. Pb (2 mg L(-1)) improved the frond As concentration by 60 to 150% in mining populations of P. vittata. Micro-X-ray absorption spectroscopy indicated that under the combined exposure of As and Pb, the As content in the rhizoid epidermis increased by about 10-fold, and the As(V) percentage increased in each rhizoid tissue, as compared with that under As exposure alone. The co-absorption of As and Pb on the epidermis and the enhanced transportation of As(V) from epidermis into the rhizoid were suggested to contribute to the increased As accumulation.
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Wan
authors.forename: Mei
authors.initials: M
authors.lastname: Lei
authors.forename: Tong-bin
authors.initials: TB
authors.lastname: Chen
authors.forename: Guang-dong
authors.initials: GD
authors.lastname: Zhou
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Xiao-yong
authors.initials: XY
authors.lastname: Zhou
authors.forename: Xi
authors.initials: X
authors.lastname: Zhang
authors.forename: Rui-xiang
authors.initials: RX
authors.lastname: Xu
mesh_terms: D001151:Arsenic / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D001673:Biodegradation, Environmental; D002681:China; D007854:Lead / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D008906:Mining; D032495:Pteris / Q000502:physiology*; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D056928:X-Ray Absorption Spectroscopy
chemical_list: D012989:Soil Pollutants; D007854:Lead; D001151:Arsenic