P. Korytar
Wageningen University and Research Centre
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Publication
Featured researches published by P. Korytar.
Journal of Chromatography A | 2003
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
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
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
P. Korytar; Adrian Covaci; Jacob de Boer; Anke Gelbin; U.A.T. Brinkman
Journal of Chromatography A | 2005
P. Korytar; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman
Journal of Chromatography A | 2005
P. Korytar; Adrian Covaci; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman
Journal of Chromatography A | 2005
P. Korytar; J. Parera; P.E.G. Leonards; F.J. Santos; J. de Boer; U.A.Th. Brinkman
Journal of Chromatography A | 2005
P. Korytar; J. Parera; P.E.G. Leonards; J. de Boer; U.A.Th. Brinkman
Journal of Chromatography A | 2004
P. Korytar; Conny Danielsson; P.E.G. Leonards; Peter Haglund; J. de Boer; U.A.Th. Brinkman
Environmental Science & Technology | 2008
E.M. Skoczynska; P. Korytar; J. de Boer