Accelerated solvent extraction method
AssigneeDionex Corporation
InventorsBruce E. Richter, Christopher A. Pohl, Nathan L. Porter, Brian A. Jones, John L. Ezzell, Nebojsha Avdalovic
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Abstract
Methods for the solvent extraction of organic analytes from a sample are provided. An organic solvent system is used to extract analytes under elevated temperatures and pressures above 100 psi but below supercritical conditions in short times and with low amounts of solvent. The extracted organic analytes are then removed by flowing a purge fluid through the extraction cell, the cell being maintained at a constant volume throughout the extraction and purging, afterwards the analytes being analyzed.
Claims35
An analytical method for solvent extraction of organic analytes from a sample and for analyzing organic analytes, said method comprising,
- (a) maintaining a sample containing organic analytes in contact with an extraction fluid consisting essentially of a non-aqueous organic solvent system in an extraction cell under elevated temperatures and pressures below supercritical conditions for a sufficient time to substantially non-selectively extract said organic analytes from said sample, said organic solvent system being in liquid form under standard conditions of temperature and pressure and during extraction, said extraction pressure being at least about 100 psi, the volumetric ratio of said organic solvent system to said extraction cell being no greater than 5:1, and
- (b) removing said extracted organic analytes dissolved in said organic solvent system without further extraction, by flowing a purge fluid through the extraction cell, said extraction cell being maintained at a constant volume during steps (a) and (b), and
- (c) analyzing said removed, extracted organic analytes.
Dependencies are inferred from the claim text.