Journal
ANALYTICAL METHODS
Volume 5, Issue 16, Pages 3999-4004Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ay40475g
Keywords
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Funding
- National Basic Research Program of China [2009CB421601]
- National Science Foundation of China [21175038]
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A novel two-step extraction technique combining ultrasound-assisted emulsification liquid-liquid microextraction with magnetic retrieval has been developed and applied to the analysis of six polycyclic aromatic hydrocarbons in environmental water samples coupled with high-performance liquid chromatography. The technique involves an initial extraction of the target analytes by ultrasound-assisted emulsification liquid-liquid microextraction into fine droplets of an organic extractant; and a retrieval and separation process of the organic phase from the aqueous solution with highly hydrophobic magnetic particles. In this way, the organic phase containing the analytes is the target of the magnetic retrieval step rather than the analytes directly. A noteworthy feature of the method is the introduction of highly hydrophobic magnetic particles with hierarchical structure for the magnetic retrieval of an extractant. Under the optimized conditions, good linearity ranging from 0.016 to 80 mu g L-1 was obtained in spiked water samples with correlation coefficients (R-2) ranging from 0.9962 to 0.9998 and low limits of detection ranging from 2.0 to 19.5 ng L-1. The proposed method has been validated in the analysis of real water samples with recoveries in the range of 75.4% to 110.5% and relative standard deviations of less than 9.9%.
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