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Title: Solid-phase extraction of polycyclic aromatic hydrocarbons in surface water: Negative effect of humic acid
Authors: Li, N.
Lee, H.K. 
Keywords: Humic acids
Polynuclear aromatic hydrocarbons
Solid-phase extraction
Water analysis
Issue Date: 6-Jul-2001
Source: Li, N., Lee, H.K. (2001-07-06). Solid-phase extraction of polycyclic aromatic hydrocarbons in surface water: Negative effect of humic acid. Journal of Chromatography A 921 (2) : 255-263. ScholarBank@NUS Repository.
Abstract: The effect of humic acid on solid-phase extraction of polycyclic aromatic hydrocarbons (PAHs) from surface water was studied. The hydrophobic PAHs show significant association with humic acid, and this was confirmed to be the cause of negative effect when conventional reversed-phase solid-phase extraction (RP-SPE) was employed to extract the analytes from aqueous samples. As an alternative, dynamic ion-exchange (DIE) SPE could simultaneously extract both the fraction of the analytes which was associated with humic acid, and that which was freely dissolved. Using the 16 US Environmental Protection Agency priority PAHs as model compounds, the recoveries of the highly hydrophobic components by DIE-SPE were 10-30% higher than those by RP-SPE for a 1000-ml water sample dissolved with Aldrich humic acid (of 4.1 mg/l dissolved organic carbon content). A similar result was also obtained for 500 ml of natural surface water although the difference in recoveries between the two methods for this sample was smaller than that for the simulated sample. For validation of the method, the artifacts in connection with DIE-SPE in extracting the fraction of analytes which was freely dissolved and that which was associated with humic acid were investigated. © 2001 Elsevier Science B.V.
Source Title: Journal of Chromatography A
ISSN: 00219673
DOI: 10.1016/S0021-9673(01)00879-2
Appears in Collections:Staff Publications

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