Headspace Sorptive Extraction Using Silicone Tubes for the Determination of Chlorobenzenes in Water

At the present work a new approach for headspace sorptive extraction is presented and demonstrated for the determination of twelve chlorobenzenes in water samples. It consists of a silicone tube (15 mm length) disposed 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 minutes optimized extraction time), thermodesorption is carried out by direct insertion of the silicone tube in the thermodesorption ¿ gas chromatography ¿ mass spectrometry (TD¿GC¿MS) ¿ system. Desorption of the analytes is performed at 250°C for 5 minutes with a gas flow of 50 mL/min. Repeatability (RSD: 5-10%), extraction yields (9-45%), enrichment factors (129-657) and detection limits (0.006 µg/L-0.89 µg/L) were determined and four real water samples were analyzed with the HS¿tube extraction. The results were verified with standard addition. A comparison of HS¿tube extraction with other headspace enrichment techniques underlined the high extraction capacity of the proposed method. One big advantage of tube extraction is the low cost of the silicone material. The tubes can be discarded after single use, avoiding carry over problems and cross contamination.

VAN PINXTEREN Manuela;  MONTERO SCHIEMANN Larisse;  JAESCH Sandra;  PACHCKE Heidrun;  POPP Peter; 

2009-01-13

SPRINGER HEIDELBERG

JRC47963

1618-2642,   

http://www.springerlink.com/content/j1u073063010m275/fulltext.pdf,    https://publications.jrc.ec.europa.eu/repository/handle/JRC47963,   

10.1007/s00216-008-2455-4,