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One of the latter pair is placed above the first quadrupole mass filter (91) while the other is placed over 43. Details of this optimization study will be reported in a future publication. It is now clear that cryopumping consistently improves SFC-MS performance above 300 atm. We have become increasingly confident in our ability to deliver reliable mass spectrometric data over the full pressure range of our SFC systems. In fact, since we began using cryopumping we have not yet encountered an analyte which can be eluted and detected by capillary SFC-FID which cannot likewise be eluted and detected by SFC-MS.

Can ion mobility resolution be enhanced? Where is the optimum location within the ionization region to introduce the sample? How does drift gas temperature affect sensitivity? And, most importantly, how does the ion molecule chemistry of mobile phases affect response? Nevertheless, the current state of the art of FTIMS offers considerable advantage for detection after SFC. Detection limits, mobile phase compatibility, and response versatility exceed most inexpensive detection methods available for SFC today.

K. Boyd, S. A. Quilliam, L. G. Sim, Presented at the 39th ASMS Conference on Mass Spectrometry and Allied Topics, May 19-24, 1991, Nashville, TN, U . S . A . K. ), Hy henated Techniques in Supercritical FluifChromatography and Extraction Journal of Chromatography Library Series, Vol. V. All rights reserved. 47 Chapter 4 Advances in Semi Micro Packed Column SFC and Its Hyphenation Makoto Takeuchi' and Toshinori Saito' ' Basic Research Division, JEOL Ltd. Akishima, Musashino 3-1-2, Tokyo 196, Japan 'Techunical Group, JEOL MOLEH Co.

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Analytical chemistry by Otto

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