Batch preparation of samples by dilution

Details Batch preparation of samples by dilution Batch preparation of samples by dilution

1978-04-03

1979-04-10

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

73422R, 141 7, 141 59, 422 81, 422100, 422103, G01N 114

Patent

active

041486102

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.

REFERENCES:
patent: 3028225 (1962-04-01), Sheen
patent: 3401565 (1968-09-01), Stoll et al.
patent: 3511080 (1970-05-01), Roof
patent: 3827302 (1974-08-01), Sato
patent: 3921439 (1975-11-01), Burns
patent: 4036063 (1977-07-01), Roof et al.

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