Batch preparation of samples by dilution

Abstract

In the automated, batch preparation of diluted samples, i.e., the preparation of sample/diluent aliquots of repetitively and exactly maintained fixed ratio, metered diluent is pneumatically introduced into a vented mixing chamber, using the principle of gas pressure drop in the dynamic or flowing condition to deposit and entrap the diluent in the chamber. The diluent is thus suspended on the head of a moving gas column that continues to pass through the diluent, producing bubbling agitation. Following the introduction of metered sample by a preferred technique, pressure is equilibrated, producing a momentary quiet condition, and is then reversed, compressing the column of supporting gas underneath the aliquot, and displacing the aliquot into a remote injection loop, and ultimately onto an analytical instrument for testing. The technique permits direct, successful immersion, as an illustrative example, of 2,4-dichlorophenol sample, process stream temperature 180.degree. C., into isopropyl alcohol diluent, boiling point 82.degree. C.

Dependencies are inferred from the claim text.