Method of and apparatus for chromatographic analysis

摘要

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.