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Method of and apparatus for chromatographic analysis
| Details |
Inventors: Ross, Jr., James W.; Goldring, Lionel S.; Riseman, John H.;
Assignee: Orion Research Puerto Rico, Inc. (Rio Piedras, PR)
Primary Examiner: Marcus; Michael S.
Assistant Examiner: Hill, Jr.; Robert J.
Attorney, Agent or Firm: Cesari & McKenna
An ion-chromatography system for analyzing one or more ionic species of a given polarity in solution, the system comprising an ion-exchange material reactive with such species, an eluant fluid, means for adding the eluant fluid and ionic species to the separation column, a stripper column and a detector. The eluant fluid includes at least a pair of electrically neutral molecular species reactive with one another to provide ionic constituents, the molecular species being in substantial equilibrium with the ionic constituents. The stripper column is positioned at the outlet of the separation column to receive the eluant fluid from the latter and reduce the concentration of the ionic constituents in the eluant fluid. The stripper column includes a conduit relatively permeable to the neutral molecular species in the eluant and relatively impermeable to the ionic constituents. Means are also provided for removing any of the neutral species that permeate the conduit, whereby a concentration gradient is established across the conduit. The detector is provided to quantitatively measure the chromatographically separated ionic species in the eluant discharged from the stripper column. |
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DETAILED DESCRIPTION To effect these objects, the present invention provides a novel ion-chromotography system for analyzing one or more ionic species of a given polarity in solution.
The system employs an ion-exchange resin column or bed reactive with such ionic species, and an eluant fluid capable of eluting the ionic species of interest from the ion-exchange resin.
The eluant fluid includes at least a pair of electrically neutral molecular species reactive with one another to form ionic constitutents, the neutral molecular species being in substantial equilibrium with the ionic constitutents.
The invention also includes a stripper column positioned at the outlet of the ion-exchange resin separation column for reducing the ionic conductivity of the eluant fluid discharged from the separation column.
The stripper column comprises a conduit which receives the eluant fluid from the ion-exchange resin separation column, at least a portion of the conduit wall being relatively permeable to the neutral molecular species in the eluant fluid and relatively impermeable to the ionic species of interest and the ionic constituents in the eluant.
In carrying out the method of the present invention, a solution containing one or more ionic species of interest having one polarity is added to an ion-exchange separation column containing an ion-exchange material, such as a resin.
Such material is capable of retaining the ionic species and of subsequently releasing those ionic species into the eluant fluid to provide a chromatographic separation.
The eluant fluid contains a pair of neutral molecular species reactive with one another to form ionic constituents.
The ionic constituents must be of sufficient concentration to provide the competitive background which effects the separation of the ionic species of interest from the ion exchange material.
The concentration of the ionic constituents in the eluant fluid provides the mechanism for separating the ionic species of interest from the ion-exchange material
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