Replacing the co2 absorber cartridge, Unplanned maintenance work, Regenerating the cation exchanger – Metrohm 828 IC Dual Suppressor User Manual

Page 42: Replacing the co, Absorber cartridge, D in section 5.4.1, See section 5.4.1, Described in section 5.5.1, Section 5.5.2, Described in section 5.5.2

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5 Care and maintenance

828 IC Dual Suppressor/ 8.828.1003 Instructions for Use

34

5.4.1 Replacing the CO

2

absorber cartridge

The CO

2

absorber cartridge must be replaced at regular intervals. The

replacement interval depends on the operating time of the 828 IC Dual

Suppressor and the laboratory surroundings. A color change indicates

when the absorber material is exhausted. An exhausted cartridge is

also indicated by an increased background conductivity and an

unstable baseline.

The CO

2

absorber cartridge contains alkali hydroxides. Please

observe the appropriate regulations when handling and disposing of

these chemicals.


Attaching the CO

2

absorber cartridge is described in Section 2.2.1.

• Remove the exhausted cartridge in the opposite sequence to that

described in Section 2.2.1 Point 2.

• Attach a new CO

2

absorber cartridge.

5.5 Unplanned maintenance work

If problems occur when using the 828 IC Dual Suppressor then it may

be necessary to carry out the following maintenance work. Details

about problems and their remedies are given in Section 4.1 Remedying

faults and problems.

5.5.1 Regenerating the cation exchanger

The cation exchanger in the suppressor cell may become exhausted if

the exchange capacity of the 828 IC Dual Suppressor is exceeded or if

a fault occurs during operation. The following steps should be carried

out to regenerate the cation exchanger.

1 Prepare the system

• Remove the column from the system and connect the

suppressor to the high pressure pump.

• Switch off the 828 IC Dual Suppressor at mains switch 16.

2 Regenerate the cation exchanger

1. Rinse the system with ultrapure water for 15 min (1 mL/min)

with the suppressor switched off (mains switch 16 = OFF).

2. Pump 25 mM sulfuric acid at 1 mL/min through the system for

30 min, the suppressor remains switched off (mains switch

16 = OFF).

3. Rinse the system with ultrapure water for 15 min (1 mL/min)

with the suppressor switched off (mains switch 16 = OFF).

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