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J Chromatogr A

Title:		Development and evaluation of needle trap device geometry and packing methods for automated and manual analysis
Author(s):		Warren JM; Pawliszyn J;
Address:		"Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada"
Journal Title:		J Chromatogr A
Year:		2011
Volume:		20111012
Issue:		50
Page Number:		8982 - 8988
DOI:		10.1016/j.chroma.2011.10.017
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"For air/headspace analysis, needle trap devices (NTDs) are applicable for sampling a wide range of volatiles such as benzene, alkanes, and semi-volatile particulate bound compounds such as pyrene. This paper describes a new NTD that is simpler to produce and improves performance relative to previous NTD designs. A NTD utilizing a side-hole needle used a modified tip, which removed the need to use epoxy glue to hold sorbent particles inside the NTD. This design also improved the seal between the NTD and narrow neck liner of the GC injector; therefore, improving the desorption efficiency. A new packing method has been developed and evaluated using solvent to pack the device, and is compared to NTDs prepared using the previous vacuum aspiration method. The slurry packing method reduced preparation time and improved reproducibility between NTDs. To evaluate the NTDs, automated headspace extraction was completed using benzene, toluene, ethylbenzene, p-xylene (BTEX), anthracene, and pyrene (PAH). NTD geometries evaluated include: blunt tip with side-hole needle, tapered tip with side-hole needle, slider tip with side-hole, dome tapered tip with side-hole and blunt with no side-hole needle (expanded desorptive flow). Results demonstrate that the tapered and slider tip NTDs performed with improved desorption efficiency"
Keywords:		Automation/instrumentation Benzene Derivatives/analysis/isolation & purification Chemical Fractionation/*instrumentation/methods Equipment Design *Needles Polycyclic Aromatic Hydrocarbons/analysis/isolation & purification Reproducibility of Results Volati;
Notes:		"MedlineWarren, Jamie M Pawliszyn, Janusz eng Research Support, Non-U.S. Gov't Netherlands 2011/11/08 J Chromatogr A. 2011 Dec 16; 1218(50):8982-8. doi: 10.1016/j.chroma.2011.10.017. Epub 2011 Oct 12"