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    STUDIA CHEMIA - Issue no. 2 / 2013  
         
  Article:   DETERMINATION OF COBALT AND NICKEL AFTER MODIFIED-COLD-INDUCED AGGREGATION MICROEXTRACTION BASED ON IONIC LIQUID IN HAIR AND WATER SAMPLES.

Authors:  .
 
       
         
  Abstract:   Modified-cold-induced aggregation microextraction(M-CIAME) as a separation and preconcentration method for Co +2 and Ni +2 ions determination based ionic liquid (IL) coupled to UV-Vis spectrophotometry is proposed. Cobalt and nickel were complexed with4-(2-pyridylazo)-resorcinol (PAR) as a chelating at pH 6. Then 60µL of 1-Hexyl-3-methylimidazoliumhexafluorophosphate [CMIM][PF6] was injected to 10mL of sample solution. Afterward, the mixture was cooled in an ice bath and complex extracted in to ionic liquid phase. After centrifuging the extractant phase was analyzed using a spectrophotometric detection method.Several factors influencing the microextraction efficiency of Co +2 and Ni +2 ions such as: pH, concentration of chelating agent, extractant phase volume, extraction time and interfering effect, have been investigated. Under the optimum conditions, the detection limits (LODs) of the method were5.9 and 5.87 ngL-1 for Co +2 and Ni +2, with the relative standard deviations (RSDs) for 59 ngL-1 (n=4) of Co +2 and Ni +2 were 1.85% and 1.24%. The developed method was applied to the determination of trace cobalt and nickel in water and hair samples with satisfactory results.

Keywords: Cold-induced aggregation microextraction, Ionic Liquid, Cobalt, Nickel, UV-Vis spectrophotometry.
 
         
     
         
         
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