Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
Environ Sci Pollut Res Int. 2014 Jan;21(1):325-36. doi: 10.1007/s11356-013-1895-3. Epub 2013 Jun 14.
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.
砷（As）和铅（Pb）经常共存，因此需要研究多种金属（loid）的清理技术。本研究通过野外调查和水培实验，阐明了凤尾蕨（Pteris vittata L.）对 As 和 Pb 的共积累。从中国云南省一个铅锌矿中分离出的凤尾蕨种群是 As 和 Pb 共污染的潜在提取剂。水培实验发现，凤尾蕨矿区种群叶片中 As 和 Pb 的最高浓度分别达到 12.2 和 0.99 g kg(-1)。此外，还进一步揭示了凤尾蕨中 As 和 Pb 之间的相互作用。Pb（2 mg L(-1)）在矿区凤尾蕨中使叶片 As 浓度提高了 60%至 150%。微 X 射线吸收光谱分析表明，与单独暴露于 As 相比，在 As 和 Pb 的联合暴露下，根状表皮中的 As 含量增加了约 10 倍，并且每个根状组织中的 As(V)百分比增加。这表明表皮对 As 和 Pb 的共吸收以及 As(V)从表皮向根状组织的增强运输有助于增加 As 的积累。
