TITLE

Headspace sorptive extraction using silicone tubes for the determination of chlorobenzenes in water

AUTHOR(S)
van Pinxteren, Manuela Schellin; Montero, Larisse; Jäsch, Sandra; Paschke, Heidrun; Popp, Peter
PUB. DATE
January 2009
SOURCE
Analytical & Bioanalytical Chemistry;Jan2009, Vol. 393 Issue 2, p767
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new approach for headspace sorptive extraction is presented and demonstrated for the determination of 12 chlorobenzenes in water samples. It consists of a silicone tube (15-mm length) arranged around a stainless steel rod. This device is fixed on a septum cap and exposed to the headspace of 50 mL of a salt-saturated water sample. After extraction (60-min optimized extraction time), thermodesorption is carried out by direct insertion of the silicone tube into the thermodesorption-gas chromatography-mass spectrometry system. Desorption of the analytes is performed at 250 °C for 5 min with a gas flow of 50 mL/min. Repeatability (relative standard deviation 5–10%), extraction yields (9–46%), enrichment factors (129–657), and detection limits (0.002–0.012 μg/L) were determined and four real water samples were analyzed with the headspace tube extraction. The results were verified by standard addition. A comparison of headspace tube extraction with other headspace enrichment techniques underlined the high extraction capacity of the proposed method. A big advantage of tube extraction is the low cost of the silicone material. The tubes can be discarded after single use, avoiding carryover problems and cross-contamination. [Figure not available: see fulltext.]
ACCESSION #
35774243

 

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