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    STUDIA CHEMIA - Issue no. 3 / 2008  
         
  Article:   ASSESSMENT OF AQUA REGIA EXTRACTABLE AND PLANT-AVAILABLE PB CONTENT IN POLLUTED SOIL.

Authors:  ERIKA LEVEI, MARIN ŞENILĂ, CECILIA ROMAN, MICHAELA PONTA, FRENŢIU TIBERIU, EMIL CORDOŞ.
 
       
         
  Abstract:   In this study for monitoring the soil contamination with Pb in the industrially polluted area of Baia Mare, the aqua regia extractable Pb content as well as the plant-available fraction were determined by inductively coupled plasma atomic emission spectrometry, after extraction in HCl-NHO3 mixture and in buffered DTPA, respectively. The aqua regia extractable Pb content was in the range of 88-2200 mg/kg, exceeding in all cases the alert level (50 mg/kg) and in most cases the intervention level (100 mg/kg) for sensitive soils. The plant-available Pb ranged between 10-292 mg/kg, exceeding in most soil samples the concentration limit of 20 mg/kg DTPA-extractable Pb considered to be the maximum level to avoid human risk. The average percentage of plant-available Pb was 21% showing that considerable amounts of Pb could be absorbed from soil by plants and propagated through the food chain in human organism.

Keywords: soil contamination, aqua regia extractable Pb content, plant-available Pb
 
         
     
         
         
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