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Liquid Purification

Apparatus-for-chromatographic-analysis-of-ionic-species

Method and apparatus for separating mononuclear cells from blood

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OF PREFERRED EMBODIMENTS It should firstly be stated that in the variously described embodiments, ...

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The present invention may be embodied in other specific forms and is not limited to any specific ...

Apparatus for chromatographic analysis of ionic species

Details

Inventors: Mowery, Jr., Richard A.;
Assignee: Applied Automation, Inc. (Bartlesville, OK)
Primary Examiner: Hill, Jr.; Robert J.
Assistant Examiner:
Attorney, Agent or Firm: Laney, Dougherty, Hessin & Beavers

An apparatus and method for the ion chromatographic analysis of ionic species of a common first polarity opposite to a second polarity employ an eluant ion suppressor cell having two electrodes. The ionic species to be analyzed and an eluant solution are introduced in solution to an ion exchange resin bed. The eluant solution essentially consists of an eluting reagent in solution such that the eluting reagent is ionized to form first eluant ions of the first polarity and second eluant ions of the second polarity. An effluent essentially consisting of separated ionic species, first eluant ions and second eluant ions in solution is discharged from the resin bed. The effluent is introduced through an inlet in the suppressor cell such that the effluent flows along a surface of the first and second electrodes. An electrical voltage is applied to the electrodes so as to maintain the first electrode at the first polarity and the second electrode at the second polarity. Furthermore, the voltage is maintained at a level sufficient to substantially neutralize first eluant ions flowing along the second electrode surface. Effluent portions flowing closely adjacent to the first and second electrode surfaces are passed out respective first and second outlets which are located downstream from the cell inlet. Effluent flowing from the second cell outlet is passed to a detector which detects the ionic species.

DETAILED DESCRIPTION It is, therefore, an object of the invention to provide an apparatus and method for the ion exchange analysis of ionic species.
It is also an object of the invention to provide an apparatus and method for the ion exchange analysis of ionic species which employ a means for suppressing eluant ions which does not require regeneration or replacement.
It is yet another object of the invention to provide an apparatus and method for the ion chromatographic analysis of ionic species having the capability of suppressing eluant ions, and wherein band spreading is minimized.
The above objects are realized in an apparatus and method for the ion chromatographic analysis of ionic species of a common polarity which employs an eluant ion suppressor cell with two electrodes.
For the purpose of this description, each ionic species will be assumed to be charged according to a first polarity, wherein the first polarity is opposite to a second polarity.
The ionic species to be analyzed and an eluant solution are introduced in solution to an ion exchange resin bed.
The eluant solution essentially consists of an eluting reagent in solution such that the eluting reagent is ionized to form first eluant ions of the first polarity and second eluant ions of the second polarity.
An effluent essentially consisting of separated ionic species, first eluant ions and second eluant ions in solution is discharged from the resin bed.
The effluent is introduced through an inlet in the suppressor cell such that the effluent flows along a surface of the first electrode and a surface of the second electrode.
An electrical voltage is applied to the electrodes so as to maintain the first electrode at the first polarity and the second electrode at the second polarity.
Furthermore, the voltage is maintained at a level sufficient to substantially neutralize first eluant ions flowing along the second electrode surface.
Effluent portions flowing closely adjacent to the first and second electrode surfaces are passed out respective first and second outlets which are located downstream from the cell inlet

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