Water, Air, and Soil Pollution

, Volume 87, Issue 1–4, pp 23–37 | Cite as

Mobility of sulphate in experimentally acidified soils from Galicia (NW Spain)

  • Agustin Merino
  • Eduardo Garcia-Rodeja
Article

Abstract

Retention of S042− was investigated in Galician soils throughout an intense regime of acidification. Experiments consisted of the addition of an H2SO4 solution (pH 2.7) to columns of 6 soils of contrasting properties over 1, 2, or 5 months. Leachates were obtained continuously throughout the experiment for analysis, and analysis made of the solid fractions after 1, 2 or 5 months. The greatest capacities for retention of S042− were found in soil developed from serpentine and micaschist; the lowest in soils from granite, slate and sandy sediments. The surface horizons, especially those rich in organic matter, displayed low retention of 5042-. The amount of S042− adsorbed throughout the experiment depended on the content of crystalline forms of Fe and with the Fe and Al extracted with dithionite-citrate.The low retention of S042− in the organic horizons and the slightly negative relation with the organic matter suggest an inhibitory effect of the organic matter on the S042− retention process. Results of the study show, that under conditions of moderate acidity, SO42− retention occurs in the form of adsorption; in strongly acidic conditions, the precipitation of aluminium-sulphate minerals may provide an additional retention mechanism.

Keywords

Organic Matter SO42 Serpentine Solid Fraction Crystalline Form 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Agustin Merino
    • 1
  • Eduardo Garcia-Rodeja
    • 1
  1. 1.Departamento de Edafología y Química AgrícolaFacultad de Biología Universidad de Santiago de CompostelaSantiago de CompostelaSpain

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