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3.5
Preparing the Regenerant
The type of regenerant used with the Dionex Easion depends on the analysis. A
dilute sulfuric acid regenerant is used for anion analyses; a tetrabutylammonium
hydroxide (TBAOH) regenerant is used for cation analyses. Follow the
instructions below to prepare either regenerant.
NOTE Use ASTM Type I (18.2 megohm-cm) filtered and
1. Verify that you have the correct regenerant bottle assembly (for anion
analyses: P/N 068222; for cation analyses: P/N 057713).
•
For anions, the cap is labeled
extends to the bottom of the bottle.
•
For cations, the cap is labeled
extends only about 1 cm (0.4 in) into the bottle.
2. Rinse the regenerant bottle with deionized water.
3. Fill the bottle about halfway with deionized water.
4. Determine the regenerant concentration required for the application. To
estimate the regenerant concentration required for an eluent strength, use the
appropriate formula:
Anion Regenerant Concentration = (mM eluent) x 2
Cation Regenerant Concentration = (mM eluent) x 5
Example: If you are using 20 mM methanesulfonic acid (MSA) as the eluent
for a cation analysis, use a regenerant concentration of 100 mM
tetrabutylammonium hydroxide (TBAOH).
For more information, refer to the suppressor manual and the installation
instructions for the Displacement Chemical Regeneration (DCR) 2-Liter Kit
(P/N 056882).
5. Empty the required amount of concentrate (sulfuric acid for anions; TBAOH
for cations) into the bottle.
For acid concentrates (such as the anion regenerant), always pour
the concentrate into deionized water, not into the empty bottle.
Doc. 155028-01 08/20
deionized water to prepare the regenerant.
3 • Operation and Maintenance
and the
ANION
REGEN BOTTLE OUT
and the
CATION
REGEN BOTTLE OUT
line
line
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