Showing papers by "Tyge Greibrokk published in 1996"
TL;DR: In this article, the authors compared electron capture detection (ECD), low-and high-resolution mass spectrometry (LRMS), and atomic emission detection (AED) for the gas chromatographic (GC) detection of polychlorinated biphenyls (PCBs) present in highly contaminated marine sediments.
Abstract: Electron capture detection (ECD), low- and highresolution mass spectrometry (LR- and HRMS), and atomic emission detection (AED) were compared for the gas chromatographic (GC) detection of polychlorinated biphenyls (PCBs) present in highly contaminated marine sediments. With ECD, LRMS, and even HRMS, detection was seriously disturbed by the complex matrix of the sediments, whereas AED in the chlorine-selective mode provided excellent PCB profiles without interferences. In addition, GC-AED provided congener independent responses, which enabled accurate quantitation of all PCBs based on a single calibration curve. However, because GC-AED was less sensitive than the other techniques studied, preparation of relatively large amounts of sample (10–20 g dry sediment) was required for most analyses.
25 citations
TL;DR: In this paper, the authors reviewed the environmental applications of capillary gas chromatography coupled with atomic emission derection (GC-AED) with emphasis on both the commercial and laboratory-built systems.
Abstract: Environmental applications of capillary gas chromatography coupled with atomic emission derection (GC-AED) have been reviewed with emphasis on both the commercial and laboratory-built systems. Attention was focused on (1) element-selective detection of non-metallic as well as metallic pollutants, (2) identification of contaminants, and (3) sample preparation considerations.
24 citations
TL;DR: Capillary gas chromatography with atomic emission detection (GC-AED) was evaluated for the analysis of polychlorinated biphenyls (PCBs) in this article, where individual PCBs were quantitated with an accuracy better than 10% utilizing a Cl-calibration plot based on a single randomly selected congener.
21 citations
TL;DR: Capillary gas chromatography combined with mass spectrometry (MS) and atomic emission spectroscopy (AED) was utilized for a comprehensive investigation of organic micropollutants in a marine sediment as mentioned in this paper.
14 citations
TL;DR: In this paper, the effect of make-up gas was studied for capillary gas chromatography coupled with on-column atomic emission spectrometric detection (AED), where a 350 kHz plasma was sustained inside the end of a 0.32 mm i.d.
Abstract: The effect of make-up gas was studied for capillary gas chromatography (GC) coupled with on-column atomic emission spectrometric detection (AED), where a 350 kHz plasma was sustained inside the end of a 0.32 mm i.d. capillary GC column. For selective detection of Cl and Br both the plasma background characteristics and elemental responses were stabilized during temperature programmed analysis when 10–15 ml min–1 of helium were added as a make-up gas. In addition, chromatographic peaks were protected against tailing, while Cl and Br were detected at the 4 pg s–1 level.
11 citations
TL;DR: In this paper, a 350-kHz helium plasma was evaluated for the calculation of C/Cl and C/Br ratios in compounds separated by capillary gas chromatography, and the results were comparable to data obtained with a commercial GC-atomic emission detection system based on a microwave-induced plasma.
10 citations
TL;DR: In this article, a technical product of saturated fatty acids has been analyzed to determine the structure of by-products found in the C20-22 fatty acids manufactured from fish oil, which was extracted either by supercritical carbon dioxide or by acetone.
Abstract: A technical product of saturated fatty acids has been analyzed to determine the structure of by-products found in the C20–22 fatty acids manufactured from fish oil. Short-path distillation of the weakly colored product provided a residue, which was extracted either by supercritical carbon dioxide or by acetone. Extracts and residues were analyzed by size-exclusion chromatography, supercritical fluid chromatography, and by gas chromatography, the latter combined with mass spectrometry and Fourier-transform infrared spectroscopy, and by nuclear magnetic resonance spectrometry. A series of homologs of fatty acid dimers was identified as lactone esters. Each homolog also contained several isomers with a varying number of carbon atoms in the two hydrocarbon chains of the dimers. Trimers, containing yellow components, were also present in small amounts, but the structure of the trimers has not been determined yet.
1 citations