Abstract: A solid phase extraction (SPE) filtration disk provides a glass fiber disk embedded with bonded silica/particulate chemistries homogeneously dispersed throughout the disk. Bonded silica/particulate chemistries are added to the glass fibers (and acidified water/solvent solution) during the formation of the glass fiber paper, as opposed to after the formation of the glass fiber paper. This enables homogenous dispersion of silica throughout the entire depth of the filtration disk.

Abstract: A surfactant mediation sparge tube for use with analytical instruments includes a two part purge vessel having an upper portion attached to a lower portion by a coupling device, an inner foam directing tube carried by a non-permeable disk positioned generally between the purge vessel upper and lower portions, and an internal physical foam barrier positioned in the purge vessel upper portion. The foam directing tube and disk, which may be fixed or removable, seals the lower portion of the vessel from the upper portion, directing purge gas and foam to the upper portion of the vessel only via the inner foam directing tube.