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    STUDIA CHEMIA - Issue no. 3 / 2014  
         
  Article:   APPLICATION OF MULTIWALLED CARBON NANOTUBES MODIFIED BY DIETHYL DITHIOPHOSPHATE AMMONIUM FOR SELECTIVE SOLID PHASE EXTRACTION OF ULTRA TRACES Ni(II) AND Co(II) IN RIVER WATER SAMPLES.

Authors:  . 		 
       
         
  Abstract:   In the present study, preconcentration followed by solid phase extraction of heavy metal ions, Ni(II) and Co(II) using the multiwalled carbon nanotubes (MWCNTs) and complexing reagent diethyl dithiophosphate ammonium (DDPA) were investigated and characterized by flame atomic absorption spectroscopy (FAAS). A series of experimental parameters, including sample pH, concentration of diethyldithiophosphate ammonium (DDPA), sample flow rate, eluting solution and the effect of interfering ions have been investigated systematically. The calibration graph was linear in the range of 0.4-100 µg L−1 and 0.7-120 for Ni(II) and Co(II), respectively . Under optimized conditions, the limit of detections (LOD) were 0.1 and 0.2 µg L−1 for Ni(II) and Co(II), respectively. The method was successfully applied to the preconcentration and separation of Ni(II) and Co(II) in some water samples from rivers located in industrial and nonindustrial areas.

Keywords: Solid phase extraction; diethyl dithiophosphate ammonium (DDPA); Multiwalled carbon nanotubes; river water samples; Flame atomic absorption spectrometry, Ni(II) and Co(II)
 
         
     
         
         
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