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    STUDIA CHEMIA - Ediţia nr.2 din 2015  
         
  Articol:   DEVELOPMENT OF MULTIWALLED CARBON NANOTUBES BASED SOLID PHASE EXTRACTION FOR THE DETERMINATION OF TRACE LEVEL OF Mn(II) AND Sn(IV) IN RIVER WATER SAMPLES.

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  Rezumat:   This paper reports a multiwalled carbon nanotubes (MWCNTs) modified with 3-amino-7-dimethylamino-2-methylphenazine (Neutral Red, NR) as a new solid phase extractor for determination of ultra trace amounts of Mn(II) and Sn(IV). The metal ions were retained on -column filled with the solid phase at a flow rate of 3.0 mL/min. The retained metal ions were eluted with 3 mol L−1 solution of HCl and measured by flame atomic absorption spectroscopy (FAAS). The effect of different variables such as, sample pH, concentration of 3-amino-7-dimethylamino-2-methylphenazine (Neutral Red, NR), 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 0.6-150 for Mn(II) and Sn(IV), respectively. Under optimized conditions, the limit of detections (LOD) were 0.12 and 0.16 µg L−1 for Mn(II) and Sn(IV), respectively. The method was used for determination of target metal ions in some water samples from rivers located in industrial and nonindustrial areas.

Keywords: Solid phase extraction; 3-amino-7-dimethylamino-2-methylphenazine (Neutral Red, NR); Multiwalled carbon nanotubes; river water samples; Flame atomic absorption spectrometry, Mn(II) AND Sn(IV)
 
         
     
         
         
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