23.6 What is Ion Chromatography?
Description
This article is from the Chemistry FAQ, by Bruce Hamilton B.Hamilton@irl.cri.nz with numerous contributions by others.
23.6 What is Ion Chromatography?
Ion chromatography has become the method of choice for measuring anions
( eg Cl-, SO4=, NO3- ) in aqueous solutions. It is effectively a development
from ion-exchange systems ( which were extensively developed to deionise
water and soften aqueous process streams ), and brings them down to HPLC
size. IC uses pellicular polymeric resins that are compatible with a wide pH
range. The sample is eluted through an ion-exchange column using a dilute
sodium hydroxide solution. The eluant is passed through self-regenerating
suppressors that neutralise eluant conductance, ensuring electrochemical
detectors ( conductivity or pulsed amperometric ) can detect the ions down
to sub-ppm concentrations. The major manufacturer of such systems is Dionex,
who hold several patents on column, suppression, and detection technology.
There are several books covering various aspects of the technique [13,14].
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