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Featured researches published by P. Korytar.


Journal of Chromatography A | 2003

Attempt to unravel the composition of toxaphene by comprehensive two-dimensional gas chromatography with selective detection

P. Korytar; L.L.P. van Stee; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman

Comprehensive two-dimensional gas chromatography (GC x GC) coupled with micro electron-capture and time-of-flight mass spectrometric (TOF-MS) detection has been used to analyse technical toxaphene. An HP-1 x HT-8 column combination yielded highly structured chromatograms and revealed a complex mixture of over 1000 compounds what is significantly higher number than in any study before. The analysis of a mixture of 23 individual congeners and TOF-MS evaluation of technical toxaphene showed that the chromatogram is structured according to the number of chlorine substituents in a molecule. The nature of the compounds (bornane and camphene) does not appear to have any influence. The sum of the peak areas of all congeners in each group was calculated using laboratory-written software; based on these results, the composition of technical toxaphene as a function of the number of chlorine substituents was provisionally calculated and was found that hepta- and octachlorinated compounds represents 75% of the total toxaphene area.


Hrc-journal of High Resolution Chromatography | 2000

Large volume injection in fast gas chromatography with on-column injector

P. Korytar; Eva Matisová; Henrieta Lefflerová; Jaroslav Slobodník

In this work a fast gas chromatography set-up with on-column injection was optimized and evaluated with a model mixture of C 8 -C 28 n-alkanes. Usual injection volumes when using narrow-bore (e.g., 0.1 mm i.d.) analytical columns are ca. 0.1 μL. The presented configuration allows introduction of 10-30-fold larger sample volumes without any distortion of peak shapes. In the set-up a normal-bore retention gap (1 m × 0.32 mm i.d.) was coupled to a narrow-bore (4.8 m x 0.1 mm i.d. x 0.4 μm film thickness) analytical column using a low dead volume column connector. The effects of the experimental conditions such as inlet pressure, sample volume, initial injection temperature, and oven temperature on a peak focusing are discussed. H-u curves for helium and hydrogen are used to compare their suitability for high speed gas chromatography and to show the dependence of separation efficiency on the carrier gas velocity at high inlet pressures. In the fast gas chromatography system a baseline separation of C 10 -C 28 n-alkanes was achieved in less than 3 minutes.


International Journal of Environmental Analytical Chemistry | 2011

Comparison of quantification methods for the analysis of polychlorinated alkanes using electron capture negative ionisation mass spectrometry

T. Rusina; P. Korytar; J. de Boer

Four quantification methods for short-chain chlorinated paraffins (SCCPs) or polychlorinated alkanes (PCAs) using gas chromatography electron capture negative ionisation low resolution mass spectrometry (GC-ECNI-LRMS) were investigated. The method based on visual comparison of congener group patterns of external standards used for quantification and fish samples was very sensitive for the choice of the quantification standard. Two other methods used the existing relation of the response factors with the chlorine content of SCCP mixtures for quantification. Results from the three methods above deviated from nominal values less than 20%. This was ∼50% when individual PCA standards were applied for quantification of SCCPs. The deviation is probably caused by the fact that only C10 carbon chain length standards with 5–9 chlorine atoms could be used. However, quantification using individual PCA standards is a promising method provided more standards will become commercially available. The clear advantage is that the standards are defined, which makes quantification comparable between different laboratories. Application of all four quantification methods to the analysis of four different fish samples gave results that agreed with the median values within ±40%.


Journal of Chromatography A | 2005

Retention-time database of 126 polybrominated diphenyl ether congeners and two bromkal technical mixtures on seven capillary gas chromatographic columns.

P. Korytar; Adrian Covaci; Jacob de Boer; Anke Gelbin; U.A.T. Brinkman


Journal of Chromatography A | 2005

Group separation of organohalogenated compounds by means of comprehensive two-dimensional gas chromatography

P. Korytar; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman


Journal of Chromatography A | 2005

Comprehensive two-dimensional gas chromatography of polybrominated diphenyl ethers ☆

P. Korytar; Adrian Covaci; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman


Journal of Chromatography A | 2005

Characterization of polychlorinated n-alkanes using comprehensive two-dimensional gas chromatography–electron-capture negative ionisation time-of-flight mass spectrometry

P. Korytar; J. Parera; P.E.G. Leonards; F.J. Santos; J. de Boer; U.A.Th. Brinkman


Journal of Chromatography A | 2005

Quadrupole mass spectrometer operating in the electron-capture negative ion mode as detector for comprehensive two-dimensional gas chromatography

P. Korytar; J. Parera; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman


Journal of Chromatography A | 2004

Separation of seventeen 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins and dibenzofurans and 12 dioxin-like polychlorinated biphenyls by comprehensive two-dimensional gas chromatography with electron-capture detection

P. Korytar; Conny Danielsson; P.E.G. Leonards; Peter Haglund; J. de Boer; U.A.Th. Brinkman


Environmental Science & Technology | 2008

Maximizing Chromatographic Information from Environmental Extracts by GCxGC-ToF-MS

E.M. Skoczynska; P. Korytar; J. de Boer

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J. de Boer

VU University Amsterdam

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Eva Matisová

Slovak University of Technology in Bratislava

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J. Parera

University of Barcelona

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Svetlana Hrouzková

Slovak University of Technology in Bratislava

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Jacob de Boer

Wageningen University and Research Centre

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