Analytical Chemistry Department, Universitat de Barcelona, Martí i Franquès 1-11, Barcelona ES-08028, Spain.
Chemosphere. 2013 Jan;90(2):556-64. doi: 10.1016/j.chemosphere.2012.08.028. Epub 2012 Sep 13.
This study reports data on arsenic speciation in two green algae species (Cladophora sp. and Chara sp.) and in five aquatic plants (Azolla sp., Myriophyllum aquaticum, Phylloscirpus cf. desserticola, Potamogeton pectinatus, Ruppia filifolia and Zannichellia palustris) from the Loa River Basin in the Atacama Desert (northern Chile). Arsenic content was measured by Mass spectrometry coupled with Inductively Coupled Plasma (ICP-MS), after acidic digestion. Liquid chromatography coupled to ICP-MS was used for arsenic speciation, using both anionic and cationic chromatographic exchange systems. Inorganic arsenic compounds were the main arsenic species measured in all samples. The main arsenic species in the extracts of freshwater algae and plants were arsenite and arsenate, whereas glycerol-arsenosugar (gly-sug), dimethylarsinic acid (DMA) and methylarsonic acid (MA) were present only as minor constituents. Of the samples studied, algae species accumulated more arsenic than aquatic plants. Total arsenic content ranged from 182 to 11100 and from 20 to 248 mg As kg(-1) (d.w.) in algae and freshwater plants, respectively. In comparison with As concentration in water samples, there was hyper-accumulation (>0.1% d.w.) in Cladophora sp.
本研究报告了来自智利北部阿塔卡马沙漠洛亚河盆地的两种绿藻（Cladophora sp. 和 Chara sp.）和五种水生植物（Azolla sp.、Myriophyllum aquaticum、Phylloscirpus cf. desserticola、Potamogeton pectinatus、Ruppia filifolia 和 Zannichellia palustris）中砷形态的数据。采用酸消解后，通过电感耦合等离子体质谱（ICP-MS）与质谱联用（MS）测定砷含量。采用阴离子和阳离子色谱交换系统，通过液相色谱与 ICP-MS 联用进行砷形态分析。在所有样品中，无机砷化合物是主要的砷形态。在淡水藻类和植物提取物中，主要的砷形态为亚砷酸盐和砷酸盐，而甘油-砷糖（gly-sug）、二甲基砷酸（DMA）和甲基砷酸（MA）仅作为次要成分存在。在所研究的样品中，藻类物种比水生植物积累了更多的砷。藻类和淡水植物的总砷含量分别在 182 至 11100 和 20 至 248 mg As kg(-1)（干重）之间。与水样中的 As 浓度相比，Cladophora sp. 存在超积累（>0.1% 干重）。
