Taggart M A, Mateo R, Charnock J M, Bahrami F, Green A J, Meharg A A
School of Biological Sciences, University of Aberdeen, Cruickshank Bld, St Machar Drive, Aberdeen, AB24 3UU, UK.
Environ Pollut. 2009 Mar;157(3):946-54. doi: 10.1016/j.envpol.2008.10.020. Epub 2008 Dec 5.
Arsenic is known to accumulate with iron plaque on macrophyte roots. Three to four years after the Aznalcóllar mine spill (Spain), residual arsenic contamination left in seasonal wetland habitats has been identified in this form by scanning electron microscopy. Total digestion has determined arsenic concentrations in thoroughly washed 'root+plaque' material in excess of 1000 mg kg(-1), and further analysis using X-ray absorption spectroscopy suggests arsenic exists as both arsenate and arsenite. Certain herbivorous species feed on rhizomes and bulbs of macrophytes in a wide range of global environments, and the ecotoxicological impact of consuming arsenic rich iron plaque associated with such food items remains to be quantified. Here, greylag geese which feed on Scirpus maritimus rhizome and bulb material in areas affected by the Aznalcóllar spill are shown to have elevated levels of arsenic in their feces, which may originate from arsenic rich iron plaque.
已知砷会与大型植物根部的铁膜一起积累。在阿兹纳尔科拉尔矿泄漏事件（西班牙）发生三到四年后，通过扫描电子显微镜已确定季节性湿地栖息地中残留的砷污染是以这种形式存在的。全量消解已测定彻底清洗后的“根+膜”物质中的砷浓度超过1000毫克/千克（-1），并且使用X射线吸收光谱的进一步分析表明砷以砷酸盐和亚砷酸盐两种形式存在。某些食草物种在全球广泛的环境中以大型植物的根茎和鳞茎为食，而食用与这些食物相关的富含砷的铁膜所产生的生态毒理学影响仍有待量化。在这里，在受阿兹纳尔科拉尔泄漏事件影响地区以海三棱藨草根茎和鳞茎为食的灰雁，其粪便中的砷含量升高，这可能源于富含砷的铁膜。
