TITLE

The Possibilities and Limitations of Capillary Extraction (CEx): The Case Study of Polycyclic Aromatic Hydrocarbons (PAHs) in Clean-Water Samples

AUTHOR(S)
Nardi, Luigi
PUB. DATE
January 2007
SOURCE
LC-GC North America;Jan2007, Vol. 25 Issue 1, p66
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
Capillary extraction (CEx) is used to study the solventless in-tube extraction of naphthalene, acenaphthene, phenanthrene, fluoranthene, chrysene, benzo(a)pyrene and coronene in aqueous samples prepared by analyte spiking into clean waters or, as an alternative, by using the generator-column method of sample preparation. Analysis of laden extractors is conveniently performed by high-resolution gas chromatography (GC), with a flame-ionization detector (FID). Extraction set-ups and main extraction variables are investigated from a practical point of view. For 2- to 4-ring polycyclic aromatic hydrocarbons (PAHs), equilibrium times are within a few minutes, analytical sensitivity is in the parts-per-billion (ppb) range and reproducibility is better than 10% relative standard deviation (RSD) (n = 6). Coronene behaviour is unique and presumably determined by extreme hydrophobicity and thus very negligible aqueous solubility: in-tube extraction of coronene seems possible only if starting from oversaturated samples. This is remarkably easier if the sample matrix is tap water, rather than 18.2 MΩ x cm water. Long, thinly-coated apolar extractors and uncoated but deactivated ones may be especially sensitive towards benzo(a)pyrene.
ACCESSION #
23841764

 

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