Bioaccumulation and Translocation of Arsenic in the Ecosystem of the Guandu Wetland, Taiwan

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• 作者：Chen-Wuing Liu (1)
  Yen-Yu Chen (2)
  Yu-Hsuan Kao (1)
  Sanjoy-Kumar Maji (1)
  
• 关键词：Arsenic ; Wetland ecosystem ; Kandelia obovata ; Bioconcentration factor ; Translocation factor
• 刊名：Wetlands
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：34
• 期：1
• 页码：129-140
• 全文大小：935 KB
• 作者单位：Chen-Wuing Liu (1)
  Yen-Yu Chen (2)
  Yu-Hsuan Kao (1)
  Sanjoy-Kumar Maji (1)
  
  1. Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan, Republic of China
  2. Sinotech Environmental Technology, Taipei 105, Taiwan, Republic of China
  
• ISSN：1943-6246

文摘

High arsenic (As) levels occur naturally in geothermal areas, potentially polluting downstream wetland ecosystems. The study was to determine the distribution of As among aqueous, solid, and plant phases in the Guandu Wetland of Taiwan. Chemical compounds (As, Fe, Mn, TOC, SO4 2-, and FeS2) and isotopic compositions (δ34S) in water and soil samples were analyzed to characterize the As distribution. The sequential extraction of As and total As in plant samples wasanalyzed to estimate the bioconcentration factor (BCF) and translocation factor (TF; defined as the ratio of metal concentration in the shoots to those in the roots) of As in Kandelia obovata in aqueous and solid phases. The As concentrations in plants (23.69?mg/kg) were higher than in the surrounding water (0.0018?mg/L) and soils (17.24?mg/kg). Kandelia obovata have high As bioavailability and low TF, causing easy adaptation to grow in As-contaminated wetland ecosystems. BCFplants/water (13657.92) was higher than BCFplants/soil (1.38). The uptake and bioaccumulation of As in Kandelia obovata are significant; therefore, Kandelia obovata is an As accumulator. The uptake As by the Kandelia obovata plant might depend on the oxidation of As-contained FeS2 in the aerial roots and/or adsorption of As on root surface.