Analysis of benzene, toluene, ethylbenzene, xylenes and n-aldehydes in melted snow water via solid-phase dynamic extraction combined with gas chromatography/mass spectrometry

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dc.contributor.authorSieg, Karsten
dc.contributor.authorFries, Elke
dc.contributor.authorPuettmann, Wilhelm
dc.date.accessioned2021-12-23T16:07:40Z-
dc.date.available2021-12-23T16:07:40Z-
dc.date.issued2008
dc.identifier.issn00219673
dc.identifier.urihttps://osnascholar.ub.uni-osnabrueck.de/handle/unios/7993-
dc.description.abstractThe present study describes a method based on headspace-solid-phase dynamic extraction (HS-SPDE) followed by GC/MS for the qualitative and quantitative analysis of benzene, toluene, ethylbenzene, o-, m- and p-xylene (BTEX), and n-aldehydes (C-6-C-10) in water. To enhance the extraction capability of the HS-SPDE a new cooling device was tested that controls the temperature of the SPDE needle during extraction. Extraction and desorption parameters such as the number of extraction cycles, extraction temperature, desorption volume and desorption flow rate have been optimized. Detection limits for BTEX ranged from 19 ng/L (benzene) to 30 ng/L (m/p-xylene), while those for n-aldehydes ranged from 21 ng/L (n-heptanal) to 63 ng/L (n-hexanal). At a concentration level of 2 mu g/L, the relative standard deviations (RSDs) for BTEX ranged from 3.9% (benzene) to 15.3% (ethylbenzene), while RSDs for n-aldehydes were between 6.1% (n-octanal) and 16.5% (n-hexanal) (n=7). Best results were obtained when the analyzed water samples were heated to 50 degrees C. At a water temperature of 70 degrees C GC responses decreased for all analyzed compounds. At a defined water temperature, a significant improvement of the GC response was achieved by cooling of the SPDE fiber during water extraction in comparison to an extraction keeping the fiber at room temperature. Evaluating the extraction cycles, for BTEX, the sensitivity was almost similar using 20, 40 and 60 extraction cycles. In contrast, the highest GC responses for n-aldehydes were achieved by the use of 60 extraction cycles. Optimizing. the desorption parameters, best results were achieved using the smallest technical available desorption volume of 500 mu L and the highest technical desorption flow rate of 50 mu L/s. The method was applied to the analysis of melted snow samples taken from the Jungfraujoch, Switzerland (3580 m asl), revealing the presence of BTEX and aldehydes in snow. (c) 2007 Elsevier B.V. All rights reserved.
dc.language.isoen
dc.publisherELSEVIER SCIENCE BV
dc.relation.ispartofJOURNAL OF CHROMATOGRAPHY A
dc.subjectaldehydes
dc.subjectAROMATIC-HYDROCARBONS
dc.subjectBiochemical Research Methods
dc.subjectBiochemistry & Molecular Biology
dc.subjectBTEX
dc.subjectCHEMICALS
dc.subjectChemistry
dc.subjectChemistry, Analytical
dc.subjectGC/MS
dc.subjectHAIR SAMPLES
dc.subjectICE
dc.subjectMATRICES
dc.subjectMICROEXTRACTION
dc.subjectNEEDLE
dc.subjectRAIN
dc.subjectsnow
dc.subjectsolid-phase dynamic extraction (SPDE)
dc.subjectSORPTION
dc.subjectVOLATILE ORGANIC-COMPOUNDS
dc.titleAnalysis of benzene, toluene, ethylbenzene, xylenes and n-aldehydes in melted snow water via solid-phase dynamic extraction combined with gas chromatography/mass spectrometry
dc.typejournal article
dc.identifier.doi10.1016/j.chroma.2007.11.025
dc.identifier.isiISI:000252477400022
dc.description.volume1178
dc.description.issue1-2
dc.description.startpage178
dc.description.endpage186
dc.publisher.placePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
dcterms.isPartOf.abbreviationJ. Chromatogr. A
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