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Evaluation of Single-Walled Carbon Nanohorns as Sorbent in Dispersive Micro Solid-Phase Extraction

Evaluation of Single-Walled Carbon Nanohorns as Sorbent in Dispersive Micro Solid-Phase Extraction

Juan Manuel Jiménez-Soto, Soledad Cárdenas, Miguel Valcárcel

Anal Chim Acta. 2012 Feb 10;714:76-81.

PMID: 22244139

Abstract:

A new dispersive micro solid-phase extraction method which uses single-walled carbon nanohorns (SWNHs) as sorbent is proposed. The procedure combines the excellent sorbent properties of the nanoparticles with the efficiency of the dispersion of the material in the sample matrix. Under these conditions, the interaction with the analytes is maximized. The determination of polycyclic aromatic hydrocarbons was selected as model analytical problem. Two dispersion strategies were evaluated, being the functionalization via microwave irradiation better than the use of a surfactant. The extraction was accomplished by adding 1 mL of oxidized SWHNs (o-SWNHs) dispersion to 10 mL of water sample. After extraction, the mixture was passed through a disposable Nylon filter were the nanoparticles enriched with the PAHs were retained. The elution was carried out with 100 μL of hexane. The limits of detection achieved were between 30 and 60ngL(-1) with a precision (as repeatability) better than 12.5%. The recoveries obtained for the analytes in three different water samples were acceptable in all instances. The performance of o-SWNHs was favourably compared with that provided by carboxylated single-walled carbon nanotubes and thermally treated carbon nanocones.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS76102	Carbon nanohorns, oxidized			Price

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