CURRENT-EFFICIENT SUPPRESSORS AND METHOD OF USE

The application relates to a method and device for ion chromatography or pretreatment. In the chromatographic separation stage, ions of an injected sample are eluted through a separation column using an electrolyte as the eluent. In the suppression stage, electrical conductivity of the electrolyte i...

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Bibliographic Details
Main Authors THAYER, JAMES R, BARRETO, VICTOR-BERBER, POHL, CHRISTOPHER A, SRINIVASAN, KANNAN, AVDALOVIC, NEBOJSA
Format Patent
LanguageEnglish
French
Published 12.07.2005
Edition7
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
PHYSICS
SEPARATION
TESTING
TRANSPORTING
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Summary:The application relates to a method and device for ion chromatography or pretreatment. In the chromatographic separation stage, ions of an injected sample are eluted through a separation column using an electrolyte as the eluent. In the suppression stage, electrical conductivity of the electrolyte is suppressed but not that of the separated ions so that the latter may be determined by a conductivity cell. The device comprises a self regenerating electrodialytic membrane suppressor (17) with an upstream portion sample stream flow channel defined on both sides by ion exchange membranes (34, 36) flanked by downstre am portion ion receiving and source flow channels. In order to increase the current-efficiency without the detrimental effects of excess heat generation, there is provided a lower electrical resistance in the upstream portion compared to the electrical resistance of the downstream portion.
Bibliography:Application Number: CA20002360014