Dionex Corporation

Steven B Rabin

Hamish Small

John M Riviello

John R Stillian

Keith A Friedman

Victor M Barreto

Mahmood Toofan

Method and apparatus for ion chromatography including passage of sample through a chromatographic separation column, through a suppressor column containing a resin with exchangeable ions, and then through a detector. The suppressor column is equipped with an electrical potential supplying device to electrolyze water and regenerate the suppressor column.

Intermittent electrolytic packed bed suppressor regeneration for ion

A method and apparatus for ion analysis by ion chromatography uses periodic electrolytic regeneration of a packed bed suppressor. First and second sets of columns, suppressors and detectors connected in series are linked by appropriate valving so that the effluent from the second suppressor can be passed to the first suppressor to be used in the electrolytic regeneration of the first suppressor after detection of analyte in the second detector.

A method and apparatus using suppression of eluents for the analysis of anions or cations in ion chromatography. The invention relates to the intermittent use of the electric field during electrochemical suppression to minimize background noise during detection of the ionic species caused by the application of an electric field using an electrolytic membrane suppressor. Using this intermittent electrochemical suppression system allows the detection of the analyte in the absence of the electric field. The system finds particular benefit in reducing background noise created during electrochemical suppression, and in reducing the baseline interference when analyzing organic solvent-containing samples.

Intermittent electrolytic membrane suppressor regeneration for ion

A method of streamlining and lowering the cost of operation of ion chromatography as well as improving detection limits is disclosed. The apparatus includes chromatographic separating means through which a sample is eluted in an eluent solution including an electrolyte. The apparatus includes suppressor means having a chromatography effluent compartment means separated from a detector effluent compartment means by an ion exchange membrane, forming a chromatography effluent flow channel and a detector effluent channel, respectively. Electrode means are disposed in communication with both flow channels for passing an electric current transverse to the solution that is passing through them. The chromatography effluent flows through the chromatography effluent flow channel of the suppressor and through detector means which detects resolved ionic species therein. The effluent from the detector means is then recycled through the detector effluent flow channel and forms a sump for electrolyte ions passing across the chromatography effluent as well as supplying the water for the electrolysis reaction generating acid (or base) for suppression.

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Mountain View, CA, United States of America

Steven B Rabin