Variação temporal, transporte e partição de Hg e Carbono Orgânico nas frações particulada e dissolvida da coluna d'água da bacia inferior do Rio Paraíba do Sul, RJ, Brasil

  • Almeida M
  • Rezende C
  • Souza C
  • 33

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Abstract

The mean concentration of Hg in suspended particular material (SPM) was 189±24.9 ng.g-1, presenting a interval of variation of 93 - 290ng.g-1 (November, 1999 – beginning of high discharge period and August of 2000 – low discharge period). Mercury concentration in volumetric base for suspended particulate material presented a large variation, 1.49 - 22.5ng.L-1, with small values founded in September of 1999 while higher concentrations were observed in January of 2000. The largest total suspended particulate material (229kg.s-1) transported and its Hg content (34mg.s-1) was obtained in January 2000, indicating that the transport of Hg in the water column was directly related with the discharge and SPM concentration. The geochemical partitioning coefficient (Kd~6) are at the same order of magnitude reported for other rivers of the world, reinforcing that Hg tends to migrate in the landscape preferentially associated to the particulate forms and mainly associated with organic matter. The major fraction of Hg in volumetric base is the fine particulate material (63

Author-supplied keywords

  • Hg
  • Rio Paraíba do Sul
  • colloids
  • dissolved phase
  • mercury
  • organ carbon
  • particulate phase
  • partitioning coefficient
  • river
  • suspended matter
  • ultrafiltration
  • water

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Authors

  • Marcelo. G Almeida

  • Carlos E Rezende

  • Cristina M M Souza

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