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    STUDIA AMBIENTUM - Issue no. 1-2 / 2008  
         
  Article:   THE EFFECTS OF HEAVY METALS ON CHEMICAL EQUILIBRIUMS FROM ANTROPIC SOILS.

Authors:  DUMITRU BULGARIU, LAURA BULGARIU, FEODOR FILIPOV.
 
       
         
  Abstract:  The study of heavy metals distribution and migration in antropic soils represent a priority problem of environmental geochemistry, both due to high toxicity of these metals and due to major perturbations induced by these metals at biologic and minerals systems level, from soils. Ours studies have follows the effects of heavy metals on: (i) stability of organic compounds with essential role in biogeochemical processes; (ii) essential mineral equilibriums for the re-adaptation capacity of soils (clay minerals, carbonates, etc.), (iii) acid-basic and redox equilibriums; (iv) inter-phases distribution equilibriums of microelements. In generally, the heavy metals determined a relative strong and fast destabilization of chemical equilibriums from soils, the intensity of these effects and their extinction aria being dependent by nature and heavy metals content, and by re-adaptation capacity of antropic soils, respectively. The heavy metals accumulation (ex. Cd, Pb, Cr, Hg) in soil solution determined a perturbation of acid-basic and redox equilibriums, which is usual correlated with a sever perturbation of mineral and organic components stability, from soil. These variations of physic-chemical conditions increase the accumulation probability of Cd, Pb, Hg and Cr, as species with high toxic potential and determined a major perturbation of inter-phases distribution equilibriums of microelements from soil. In this direction, ours studies have evidenced that the existence of some important perturbations of Zn, Cu and Ni distribution, due to the Cd and Hg accumulation, of Ca, Mg and alkaline metals due to the Pb accumulation, and of Fe(II) and Fe(III) equilibrium due to the Cr accumulation.

Keywords: heavy metals, antrosoils, chemical equilibrium
 
         
     
         
         
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