title: Evaluation of carbon nanocones/disks as sorbent material for solid-phase extraction.
abstract: The potential of carbon nanocones/disks as sorbent material in solid-phase extraction (SPE) procedures has been evaluated. For this aim, a model analytical problem, the determination of chlorophenols in water samples, was selected. An accurately weighed amount of 20mg of purified carbon nanocones/disks was packed in 3 mL commercial SPE cartridges. Once conditioned, up to 8 mL of water samples can be preconcentrated without analyte losses. The chlorophenols were eluted by using 200 microL of hexane. Aliquots of 2 microL of the organic extract were injected in the gas chromatograph-mass spectrometer for separation and quantification. The purification of the commercial nanocones/disks to reduce the presence of amorphous carbon has been successfully achieved by heating the carbon nanocones/disks at 450 degrees C for 20 min. Detection limits of chlorophenols were in the range 0.3-8 ng mL(-1) by using 2 mL of sample. Moreover, excellent average recovery values (98.8-100.9%) have been obtained after the analysis of water samples from different nature. Finally, the performance of the carbon nanocones/disks as sorbent material has been compared with that of multiwalled carbon nanotubes, providing the former better results under the experimental conditions assayed.
authors.affiliation: Department of Analytical Chemistry, Marie Curie Building(Annex), Campus de Rabanales, University of Cordoba, E-14071 Córdoba, Spain.
authors.forename: Juan Manuel
authors.initials: JM
authors.lastname: Jiménez-Soto
authors.forename: Soledad
authors.initials: S
authors.lastname: Cárdenas
authors.forename: Miguel
authors.initials: M
authors.lastname: Valcárcel
mesh_terms: D000327:Adsorption; D002733:Chlorophenols / Q000032:analysis; D037742:Nanotubes, Carbon / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis
chemical_list: D002733:Chlorophenols; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical