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Browsing by Subject Gas chromatography

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  • Correcting for Biogenic Gas Matrix Effects on Laser‐Based Pore Water‐Vapor Stable Isotope Measurements

    • Authors: Gralher, B.;  Advisor: -;  Participants: Herbstritt, B.; Weiler, M.; Wassenaar, L.I.; Stumpp, C. (2018)

  • However, only air‐inflated samples could be reliably corrected using instrument‐specific sensitivity factors that were empirically determined by interpretation of periodically repeated isotope measurements. Corrected water isotope data were confirmed by similarity with local precipitation and suction cup isotope data. Residual uncertainties were well below the natural variations of soil water isotope values and independent of storage time, thus allowing for consistently reliable interpretations of soil water isotope profiles. We conclude that, especially for pore water sampling that requires small sample volumes and/or long storage times, metalized sample bags should be used to preven...
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  • Evaluation of essential oil isolated from dry coriander seeds and recycling of the plant waste under different storage conditions

    • Authors: Wahba, Hend E.;  Advisor: -;  Participants: Abd Rabbu, Hala S.; Ibrahim, Mohamed E. (2020)

  • The chemical composition of coriander oil was analyzed by gas chromatography–mass spectrometry (GC–MS). The analysis of coriander essential oil showed that linalool was the main constituent of dry seed oil under all conditions. It recorded 59.6, 59.28 and 47.69% of the treatments of the oil at zero time, stored in cool conditions and stored at room temperature, respectively. Concerning oil constituents of coriander waste (the remained herb after collecting seeds), the results showed that trans-anethole was the major oil constituent, followed by linalool compound. The quality of the stored oil in the refrigerator after harvest was better than the stored oil from seeds or waste under ro...