Abstract: An apparatus for extracting an analyte from a liquid sample, comprises a microcolumn having a microparticulate media therein, the media being sandwiched between two compression layers. Preferably, the compression layers comprise a binder-free glass fiber, held in the microcolumn by upper and lower polypropylene mesh.

Abstract: System, apparatus and method for efficiently and effectively isolating analytes from a liquid sample by solid phase extraction comprises a workstation platform with a plurality of suction providing stations for receiving either or both a detachably mounted collection chamber housing a removable collection vessel and membrane holder with removable, screen supported disc membrane, the holder having an inlet opening for receiving a liquid and a passageway through the screen supported disc membrane to an exit port for flow and collection, at the appropriate time, of analytes, extraction solvent, or liquid sample. The membrane holder is adapted to be releasably mounted into either the suction stations or the collection chamber. The removable collection vessel in the collection chamber enables prompt, timely, safe and effective removal of solvent, analyte or liquid from the system. The workstation platform is preferably rotatable for ease of access to the plurality of suction providing stations.

Abstract: An automatic sample injector for high pressure liquid chromatography, utilizing a cassette-like holder of a plurality of sample columns and an automatic injection unit which sequentially and successively advances the cassette and removes each sample therefrom in accordance with the test to be conducted on the sample. The cassette-like sample carrier utilizes a plurality of sample columns disposed in line with each other, with the body of the cassette being unsymmetrical to prevent reversal thereof in the injection machine. The injection machine, when a sample cassette is placed thereon, automatically advances the cassette to the first sample column, connects the column to the chromatographic or other system, removes the sample therefrom, decouples the sample tube from the system and again advances the cassette to the next sample tube therein for similar processing thereof.