Summary
In the framework of the cometary sampling and composition (COSAC) experiment of the European Space Agency (ESA) Rosetta space mission to a comet, a new generation of porous polymer porous-layer open tubular (PLOT) columns has been investigated with the aim of separating the light organic compounds targeted by the experiment within the constraints of the operating conditions used in space. Both styrene-divinylbenzene and ethylene glycol-dimethyl acrylate-divinylbenzene porous polymers can be used to separate most of the target compounds, but the latter was selected because of its better separating properties. The most appropriate column characteristics were found to be 10 m length, 0.18 mm internal diameter, and 1–2 μm layer thickness, despite the low sample-loading capacity of such a column, which impairs its chromatographic performance. The influence of column overloading on retention properties and efficiency was, therefore, studied. To achieve the separation with optimum sensitivity, and within the in-situ time allowed for the analysis, it was also demonstrated that the maximum allowed temperature and reduced outlet pressure are required. Finally, it was shown that in the presence of water, the most abundant volatile compound in comets the separating properties of the studied columns are conserved. This paper thus demonstrates the suitability of the porous polymer PLOT column selected for the COSAC experiment and requirements for use in space; it is the first porous polymer PLOT column to be used in space exploration.
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Szopa, C., Sternberg, R., Coscia, D. et al. In-situ chemical investigation of a comet nucleus by gas chromatography: Porous layer open tubular columns for the separation of light, volatile compounds. Chromatographia 54, 369–376 (2001). https://doi.org/10.1007/BF02492686
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DOI: https://doi.org/10.1007/BF02492686