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Extraction and Recovery of Organic Pollutants from Environmental Solids and Tenax-GC Using Supercritical CO2
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1986
Year
Solvent ExtractionEngineeringSupercritical Fluid ChromatographyChemistryChemical EngineeringEnvironmental ChemistryEnvironmental SolidsQuantitative RecoveryPetroleum ProductionAnalytical ChemistryOrganic PollutantsPolycyclic Aromatic HydrocarbonChromatographyCarbon SequestrationSupercritical FlowSupercritical Co2 ExtractionsSupercritical Co2Combustion ScienceEnhanced Oil ProductionSupercritical Co2 ExtractionPetroleomics
The use of supercritical CO2 extractions to yield rapid and quantitative recovery of polycyclic aromatic hydrocarbons (PAHs) from both solid samples and Tenax-GC sorbent traps is described. Supercritical CO2 extractions of National Bureau of Standards SRM1650 (diesel exhaust particulate) with and without 5% methanol modifier yielded quantitative recovery of the PAHs with extraction times as short as 30 min. Quantitative analysis of the extracted PAHs using gas chromatography/mass spectrometry (GC/MS) gave excellent agreement with certified values. Class-specific extractions of alkanes and PAHs from diesel exhaust particulates were also obtained by varying extraction pressures. Supercritical CO2 extraction of Tenax-GC sorbent traps were shown to give satisfactory blanks and quantitative recovery of PAHs as large as coronene (molecular weight = 300) at low temperatures (45°C). Finally, direct coupling of the supercritical fluid extraction step with on-column cryogenic trapping in a gas chromatographic column (analogous to thermal desorption/cryogenic trapping techniques) is demonstrated.