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Comparative supercritical-fluid chromatographic properties of carbon dioxide and sulphur hexafluoride-ammonia mixtures with packed columns

✍ Scribed by J.L. Veuthey; J.L. Janicot; M. Caude; R. Rosset

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 407 KB
Volume: 499
Category: Article
ISSN: 1873-3778
DOI: 10.1016/s0021-9673(00)97008-0

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✦ Synopsis

The separation of polar compounds by supercritical-fluid chromatography is difficult with carbon dioxide as mobile phase. In this work, we tested mixtures of ammonia with sulphur hexafluoride as mobile phase and we have compared the solvating power of these mixtures with carbon dioxide for five solutes. The results show that the solvating power of sulphur hexafluoride-ammonia is weak in comparison with carbon dioxide, except for aniline. Ammonia plays only a role as silanol masking agent. Furthermore, ammonia is harmful for the pumping system.

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