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CH3041
ION CHROMATOGRAPHY
III
Ion
Chromatography is the method of choice for anion analysis in
natural waters using an anion exchange resin.
• A column is made up in the CO32- form and the
anionic sample is placed on the column.
• Gradient elution
with Na2CO3 will separate anions according to
selectivity eg SO42- > NO3-
• A membrane ion
suppressor
is used which protonates the
anions. H2CO3 doesn’t ionise
much while other ions
(eg HNO3 H2SO4) do.
is used which protonates the
anions. H2CO3 doesn’t ionise
much while other ions
(eg HNO3 H2SO4) do.
• Detectors: Normally a
conductivity detector is used
as this has a universal
response to ionic analytes.
conductivity detector is used
as this has a universal
response to ionic analytes.
