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    STUDIA CHEMIA - Issue no. 1 / 2005  
         
  Article:   COMPARATIVE STUDY OF DIGESTION PROCEDURES OF SOILS AND WATER SEDIMENTS USING DIFFERENT HCL/HNO3 RATIOS FOR MULTIELEMENTAL DETERMINATION.

Authors:  EMIL CORDOŞ, MARIN ŞENILĂ, MONICA URSU, EUGEN DARVASI, MICHAELA PONTA, FRENŢIU TIBERIU.
 
       
         
  Abstract:  The suitability of three digestion procedures using aqua regia (a), Lunge mixture with (b) and without evaporation to dryness (c) was investigated to determine Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Ti, V and Zn in soils and water sediments. The results for metals determined by ICP-AES in four certified materials digested using the three procedures were compared with the certified values. The dissolution effects for different HCl/HNO3 ratios are explained and the most adequate digestion methods for the determination of these 12 heavy metals are recommended based on the recovery degree. Cadmium, Cr, Cu, Mn, Ni, Pb and Zn could be determined subsequent any of the three digestion procedures. Aluminium and Fe were quantitatively extracted only in aqua regia, while V and Ti either in aqua regia or Lunge mixture with evaporation to dryness. In the case of As, a volatile element, only the extraction in aqua regia with the collection of gases gave a good recovery degree, while the Lunge procedure without evaporation resulted in an unsatisfactory result.  
         
     
         
         
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