Hermetic sealing characterization

We also suggest application of GC-FID analysis of gas, long chained alkanes and biomarkers to realize the full potential of inelusions to reservoir studies as these may represent hermetically sealed testers of palaeo-petroleum. Furthermore, only the use of fluid inclusions in combination with standard geochemical core bitumen quantification, compositional analysis and GC-FID plus GC-MS characterization, can fully realize the potential of these methods for deciphering movement of OWCs during time and determining the time for field filling. 

The isotope composition of gases taken from hermetically sealed holes drilled in rocks of the ijolite-urtit complex of the Khibiny Massif (Kola Penisula), consisting of C2H6, C3H8, isobutene, butane, isopentane, pentane, C6H14, H2,02, N2, Ar, He, CO and CO2, is characterized by the ratios equal to 1.1160%- .11482% in ijolites and... 

Estimation of carbon, hydrogen and sodium content in residue About 10 mg of solid residues left after the decomposition of sodium alkoxides were loaded in tin crucibles of size 3.5x9.0x0.1 mm inside the argon atmosphere glove box and hermetically sealed by crimping as described in characterization on RONa. These crucibles were loaded in the CHNS elemental analyzer (M/s Elementar Vario EL, Germany) for measurement of carbon and hydrogen contents as explained previously. 

Isothermal crystallization characterization was performed using a Perkin - Elmer Pyris 1 system, which was calibrated using the melting temperature and enthalpy of indium. The samples with a weight around 12 mg were put into an aluminum pan and hermetically sealed. An empty pan was used as a reference. For crystallization characterization, a sample was heated from 20 to 200°C at 20°C/min and maintained at 200°C for 2 min. Subsequently, it was rapidly quenched (-80°C/min) to the isothermal crystallization temperature and held there until completion of crystallization. Once crystallized, the samples were then reheated to 200°C at a rate of 20°C/min in order to investigate the melting behavior. 

The loss of trace analytes can be minimized by conducting all operations in a system that is almost completely sealed hermetically from the ambient atmosphere, and by using vessel materials characterized by a small effective. surface area [3J. Surfaces should be free of fissures and preconditioned as necessary to minimize physical adsorption of the analyte (e.g., through ion exchange or hydro-phobic interactions). It is also important to consider the possibility of diffusion into or through the vessel walls. 

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