Carboxylated Multiwalled Carbon Nanotubes as Dispersive Solid-Phase Extraction Sorbent to Determine Eighteen Polychlorinated Biphenyls in Vegetable Samples by Gas Chromatography-Mass Spectrometry
Table 2
Comparison of the proposed method with other methods reported in the literature for the determination of PCBs in vegetable samples.
Extraction
Cleanup
Detection
Volume of extraction solvent (mL)
Sample preparation time (h)
LOD (μg/kg)
Recovery
Reference
Soxhlet extraction
Concentrated sulfuric acid and silica gel/alumina column