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      Sequential extraction of heavy metals in river sediments of an abandoned pyrite mining area: pollution detection and affinity series.

      Environmental Pollution (Barking, Essex : 1987)
      Adsorption, Environmental Monitoring, methods, Geologic Sediments, chemistry, Industrial Waste, Iron, Metals, Heavy, analysis, Mining, Rivers, Soil, Soil Pollutants

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          Abstract

          In this paper heavy metal pollution at an abandoned Italian pyrite mine has been investigated by comparing total concentrations and speciation of heavy metals (Fe, Cu, Mn, Zn, Pb and As) in a red mud sample and a river sediment. Acid digestions show that all the investigated heavy metals present larger concentrations in the sediment than in the tailing. A modified Tessier's procedure has been used to discriminate heavy metal bound to organic fraction from those originally present in the mineral sulphide matrix and to detect a possible trend of metal mobilisation from red mud to river sediment. Sequential extractions on bulk and size fractionated samples denote that sediment samples present larger percent concentrations of the investigated heavy metals in the first extractive steps (I-IV) especially in lower dimension size fractionated samples suggesting that heavy metals in the sediment are significantly bound by superficial adsorption mechanisms. Copyright 2004 Elsevier Ltd.

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          Journal
          15312934
          10.1016/j.envpol.2004.05.002

          Chemistry
          Adsorption,Environmental Monitoring,methods,Geologic Sediments,chemistry,Industrial Waste,Iron,Metals, Heavy,analysis,Mining,Rivers,Soil,Soil Pollutants

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