1
– Introduction
Thermo Scientific
Product Manual for the ERS 500 Suppressor
Page 11 of 84
031956-11
For Research Use Only. Not for Use in Diagnostic Procedures.
AERS 500, cation exchange functionality extends across the electrodes. The function of this is
to lower the resistance and aid in the transport of ions in and out of the eluent channel. In the
Dionex ERS 500 the eluent channel is filled with ion exchange resin and provides a static
capacity which is particularly useful when eluent is pumped into the device with the power off.
In operation the electrolytically generated hydronium ions in the Dionex AERS 500 are driven
towards the cathode along with eluent cations by the applied voltage. The membrane allows
hydronium ions to pass into the eluent chamber resulting in the conversion of the electrolyte of
the eluent to a weakly ionized form. For each hydronium ion entering the eluent channel one
hydronium or a cation exits the device and is driven towards the cathode. At the cathode the
cations combine with the electrolytically generated hydroxide ions to form water or base.
Overall the current dictates the concentration of hydronium and hydroxide ions.
The eluent suppression process is illustrated for Anion Suppressor in
Suppressor in
