Solid phase extraction of trace cobalt (II) in industrial wastewaters by modified nanotube carbon carboxyl and its determination with flame atomic spectroscopy
Subject Areas : International Journal of Bio-Inorganic Hybrid Nanomaterials
Keywords: Preconcentration, FAAS, SPE, Flame atomic absorption spectroscopy, Carbon nanotubes functionalized with carboxyl, Co (II) ion,
Abstract :
Applying a simple and selective sample preparation procedure prior to instrumentalanalysis is the most important and crucial step in an analytical process. Up to now, various samplepreparation techniques based on solid phase extraction (SPE) systems have been developed to isolatevarious types of analytes from different matrices. In the method presented for preconcentration andmeasurement of trace amounts of cobalt (II) ions in aqueous samples, carbon nanotubes functionalizedwith carboxyl were used for improving the extraction and preconcentration action. Measurement of Co2+ion concentration in aqueous solutions was performed by flame atomic absorption spectroscopy. Theparameters including the extraction including pH, amount and type of desorption solvent, extractiontime, the effect of other ions, etc. were optimized. The concentration factor, level of detection (LOD)of the method, and relative standard deviation (RSD %) were obtained as 20.83, 6 μg.L-1, and 1.16%,respectively.