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  • Title: Arsenic fractionation in agricultural acid soils from NW Spain using a sequential extraction procedure.
    Author: Nóvoa-Muñoz JC, Queijeiro JM, Blanco-Ward D, Alvarez-Olleros C, García-Rodeja E, Martínez-Cortizas A.
    Journal: Sci Total Environ; 2007 May 25; 378(1-2):18-22. PubMed ID: 17289117.
    Abstract:
    Arsenic fractionation has been studied in nine vineyard soils from a wine-producing area in Galicia (NW Spain) characterized by an unusually high As content. Total As concentrations are 7 to 10 times higher the maximum values allowed by the legislation, reaching maximum value of 200 mg kg(-1). The study of As fractionation revealed that those fractions showing strong correlations to crystalline Fe and Al hydrous oxides (r>0.69, p<0.01 and r>0.71, p<0.01 respectively) represented, on average, higher than the 80% of total As. The low levels of mobile and potentially toxic As fractions (<4% of total As) suggest that its toxicity is partially minimized in these soils, although the modifications induced by soil management could promote an increase of As availability.
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