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    STUDIA CHEMIA - Issue no. 3 / 2008  
         
  Article:   ESTIMATION OF METALS BIOAVAILABILITY IN RIVER WATERS BY IN SITU SPECIATION USING THE TECHNIQUE OF DIFFUSION GRADIENTS IN THIN FILMS (DGT).

Authors:  MARIN ŞENILĂ, ERIKA LEVEI, CECILIA ROMAN, LĂCRIMIOARA ŞENILĂ, EMIL CORDOŞ.
 
       
         
  Abstract:   Trace metals such as Cu, Zn, Mn and Ni play an important role as essential elements in aquatic systems. Elevated concentrations of these elements and of non-essential elements such as Cd, however, may be toxic. Investigation of the speciation of trace metals is a prerequisite to evaluating their bioavailability and mobility. Biological responses of organisms often have been shown to be related to the free-ion activity of a metal ion or to the concentration of labile metal species in solution. We evaluated the application of DGT as a tool to determine Cu, Zn, Ni, Cd and Mn concentrations and speciation in Crisul Alb River. Total metals, dissolved metals and labile-DGT metals concentration were determined. The DGT-labile species of Cu and Zn amounted to 15–30% of the total dissolved concentrations, Cd and Ni to 40-50% and Mn to 70-80%.

Keywords: DGT, metals bioavailability, speciation, ICP-MS
 
         
     
         
         
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