Supercritical Fluid Extraction of Inorganics in Environmental Analysis
Environment: Water and Waste
Published Online: 15 SEP 2006
Copyright © 2000 John Wiley & Sons, Ltd. All rights reserved.
Encyclopedia of Analytical Chemistry
How to Cite
Ashraf-Khorassani, M., Taylor, L. T. and Combs, M. T. 2006. Supercritical Fluid Extraction of Inorganics in Environmental Analysis. Encyclopedia of Analytical Chemistry.
- Published Online: 15 SEP 2006
Supercritical fluid extraction (SFE) of metal ions via in situ chelation and preformed metal chelates using pure or modified CO2 from several matrices has been accomplished. To understand the extraction results better, the solubilities of different ligands and metal chelates have been measured in supercritical fluids (SFs). In most cases, fluorinated chelates have been found to possess higher solubility in the SF than nonfluorinated ones, which in turn can often enhance extraction efficiency. Metal chelate stability under supercritical conditions plays an important role in the extraction of metals. Also, the matrix has a major effect on extraction efficiency of both hydrated metal ions and metal chelates. In order to obtain sufficient extraction not only should solubility of the metal complex be considered, but also the overall stability of the complex is critical.