Parking a sample stream and suppressing the sample

Details Parking a sample stream and suppressing the sample Parking a sample stream and suppressing the sample

2004-09-02

2008-07-15

Therkorn, Ernest G (Department: 1797)

Liquid purification or separation

Processes

Chromatography

C210S635000, C210S638000, C210S659000, C210S198200, C204S520000, C204S630000

Reexamination Certificate

active

07399415

ABSTRACT:
Pretreatment method and apparatus to remove matrix ions from a liquid sample, prior to separation of the sample analytes (e.g. by chromatography), by flowing the liquid sample into a sample compartment and stopping the flow. The sample compartment has a wall comprising an ion exchange membrane having exchangeable ions of the same charge as the matrix ions to be removed. A regenerant liquid stream flows through a regenerant flow compartment on the other side of the membrane from said parked liquid sample. Matrix ions in the parked liquid sample are transported across the membrane into the regenerant flow compartment. Suppression may be performed electrolytically and/or chemically. A concentrator column may also be used.

REFERENCES:
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patent: 6808608 (2004-10-01), Srinivasan et al.
patent: WO 94/02227 (1994-02-01), None
patent: WO 97/22876 (1997-06-01), None
De Borba, B., et al., “Online dialysis as a sample preparation technique for ion chromatography,”J. Chromatogr. 919(1):59-65 (Jun. 2001).
Haddad, P., et al., “Developments in suppressor technology for inorganic ion analysis by ion chromatography using conductivity detection,”J. Chromatogr. A 1000(1-2):725-742 (Jun. 2003).
Montgomery, R., et al., “Online sample preparation techniques for ion chromatography,”J. Chromatogr. A 804(1-2):55-62 (Apr. 1998).

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