Trapping efficiencies of various collection solvents after supercritical fluid extraction

A polarity test mix consisting of acetophenone, N , N ‐dimethylaniline, naphthalene, decanoic acid, 2‐naphthol, and n ‐tetracosane was spiked onto sand, and extracted with supercritical carbon dioxide, to evaluate the collection efficiency of various solvents and solvent mixtures. Nine single collection solvent systems and four mixed collection solvent systems were studied. When one‐component collection solvents were employed, quantitative (above 90%) recovery of all analytes was not possible. With mixed collection solvents, recoveries of 90% or better with all analytes studied were possible.