Patent ID: 9440166
Filing Date: 2016-09-13
CPC Classification: B01D,G01N

Claim Text:
1. A method of extracting an analyte from a sample, the method comprising: adding the sample to a sample container; adding a mixture of a liquid solvent and a gas into the sample container, in which the liquid solvent and the gas are flowed into the sample container at a same time, the addition of the gas being controlled to establish a superatmospheric pressure P within the sample container; heating the liquid solvent to an elevated temperature T, in which T is below the boiling temperature of the liquid solvent at the superatmospheric pressure P, and in which either P or T is maintained below the critical point of the gas, in which the superatmospheric pressure P is not greater than about 100 pounds per square inch relative to an ambient pressure, in which the heating of the liquid solvent is at a temperature T ranging from about 30° C. to about 300° C., in which the gas does not transition to a supercritical fluid or a liquid state at the superatmospheric pressure P and the temperature T; dissolving the analyte from the sample into the liquid solvent within the sample container, in which the analyte does not dissolve into the gas; and removing at least a portion of the liquid solvent from the sample container, in which at least 85% of the analyte is extracted from the sample and dissolved in the liquid solvent.