IonPac NS1 Manual
Document No. 034024-06
Page 13 of 35
regenerant stream. As the recycled regenerant is pumped through the AutoRegen Regenerant Cartridge, the TBA + ions are
exchanged for hydronium ions. However, the solvent is not removed from the recycled regenerant and continues to accumulate
in the recycled regenerant stream. Eventually the concentration of solvent in the recycled regenerant can cause the background
conductivity to increase which can result in a noisy background. Most solvents have no affect on the cartridge lifetime. In all cases
the ionic strength of the eluent determines the lifetime of the AutoRegen Regenerant Cartridge.
For ease of use and guaranteed high purity, use Dionex Anion Regenerant Concentrate (P/N 037164, 039601) to make regenerant
for the ASRS ULTRA II.
3.7.2 CSRS ULTRA II in Chemical Suppression
For ease of use and guaranteed high purity, use Dionex Cation Regenerant Concentrate (P/N 039602) to make regenerant for the
CSRS ULTRA II.
CAUTION
Acetonitrile is not compatible with the CSRS ULTRA II in the Chemical Suppression Mode when using an
AutoRegen Accessory unit. The acetonitrile diffuses into the TBAOH regenerant, concentrates during recirculation
and eventually hydrolyzes to acetate and ammonia, rapidly depleting the capacity of the AutoRegen Cation
Regenerant Cartridge. If acetonitrile is used as an eluent component, a pressurized regenerant delivery bottle
must be used instead of the AutoRegen Accessory.
3.8
Using Pressurized Regenerant Reservoir with the AMMS-ICE II
The operation of the AMMS-ICE II requires a constant flow of the regenerant over the membrane, in a direction that is
countercurrent to the flow of the eluent.
For the best signal to noise ratio and overall performance, Dionex recommends that the Cation Regenerant Solution (P/N 039602)
be pressurized with nitrogen or helium. Do not use air.
NOTE
Use nitrogen or helium to pressurize the Regenerant Reservoir.
