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Direct on-line coupling of small subcritical and supercritical fluid extractors with packed column supercritical fluid chromatography (1988)

Jahn, K. R. ; Wenclawiak, B.

Springer

Chromatographia 26 (1988), S. 345-350

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ISSN: 1612-1112

Keywords: Supercritical fluid chromatography ; On-line subcritical/supercritical fluid extraction ; Packed columns

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Summary A mini extractor of 85 μL void volume and a micro extractor of 3–4 μL void volume have been coupled directly with a packed column SFC and used under sub- and supercritical conditions. The mini extractor is suitable for holding adsorbates which can be on-line extracted and the extract chromatographed (direct SFE-SFC). The micro extractor can be used for direct sample introduction of liquid and solid materials under SF conditions. Thus any solvent interference with the sample and the chromatographic conditions is excluded. Standard samples of wood tar residue, engine oil, and metal organic compounds have been tested.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02268179

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Radiation effects in static SIMS of polymers (1994)

Licciardello, A. ; Wenclawiak, B. ; Boes, C. ; [et al.]

Chichester [u.a.] : Wiley-Blackwell

Surface and Interface Analysis 22 (1994), S. 528-531

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ISSN: 0142-2421

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Physics

Notes: The formation of dimerized polystyrene molecules during static SIMS measurements, already reported in a previous paper [Surf. Interface Anal. 20, 549 (1993)] has been further investigated. Samples of styrene oligomers with very narrow molecular weight distribution were prepared by fractionating polystyrene standards by means of supercritical fluid chromatography and then irradiated in situ in a time-of-flight SIMS spectrometer. Pre-irradiated samples have also been studied for comparison purposes. The results obtained confirm that crosslinked (dimerized) species are formed and detected in the very low fluence range, and strongly support the hypothesis that, at least partly, the observation of this kind of Ion beam modification is not due to ion impact overlaps during the measurement, but to primary modification/desorption events.

Additional Material: 5 Ill.