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      Measurement of arsenic compounds in littoral zone algae from the Western Mediterranean Sea. Occurrence of arsenobetaine.

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          Abstract

          The determination of arsenic compounds in algae collected on the Catalan coast (Western Mediterranean) is reported. Ten algae species and the seagrass Posidonia oceanica were analyzed. Total arsenic in the samples was determined by microwave digestion and inductively coupled plasma mass spectrometry (ICPMS). Arsenic speciation in water extracts of samples was analyzed by liquid chromatography with both anionic and cationic exchange with ICPMS detection (LC-ICPMS). The total arsenic content of the algae samples ranged from 2.96 to 39.0mg As kg(-1). The following compounds were detected: arsenite (As(III)), arsenate (As(V)), methylarsonate (MA), dimethylarsinate (DMA), sulfonate sugar (SO3-sug), sulfate sugar (SO4-sug), phosphate sugar (PO4-sug), arsenobetaine (AB), arsenocholine (AC), trimethylarsine oxide (TMAO) and glycerol sugar (Gly-sug). The main arsenic species found were arsenosugars. Significant percentages of arsenobetaine (0.54 mg As kg(-1), 28% of the extractable arsenic and 0.39 mg As kg(-1), 18% of the extractable arsenic) were found in Ulva rigida and Enteromorpha compressa. These results are discussed in relation to the presence of epiphytes.

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          Author and article information

          Journal
          Chemosphere
          Chemosphere
          Elsevier BV
          1879-1298
          0045-6535
          Nov 2010
          : 81
          : 7
          Affiliations
          [1 ] Department of Analytical Chemistry, Universitat de Barcelona, Martí i Franquès 1-11, Barcelona E-08028, Spain.
          Article
          S0045-6535(10)00885-4
          10.1016/j.chemosphere.2010.08.007
          20880567
          519b8e62-c2ea-4766-9bbd-52a83f1137bf
          History

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