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Which grade of water can be used for preparing eluent for ion chromatography?

• Tap water

• Deionised water

• Ultra pure water

• Mineral water

• > 18.2 MOhm Resistivity

Why must the water used for eluent preparation be degassed?

• Gas bubbles can damage IC system

• Gas bubbles can affect retention time

• Dissolved CO2 can affect chemical equilibrium of carbonate eluent

• Dissolved gases can shorten column life

What is the appropriate membrane pore size that should be used for filtering eluent and samples?

• 0.2 µm 

• 0.45 µm 

• 20 µm 

• 1.0 µm 

How often should the peristaltic pump tubing be exchanged?

• Monthly

• Every two months

• Every four months

• Every six months

When should the guard column be exchanged?

• Monthly

• 300-500 injections

• When backpressure is very high

• Every 12 months

What is/are the proper steps to be performed, if the ion chromatograph is not use for a longer period of time (>1 week)?

a. Columns and guard be removed and suitable storage

b. Entire flow path be rinsed with 20% Methanol water for at least 10 min

c. Flush all 3 channels of the suppressor MSM with 20% Methanol

d. Release the contact pressure of the peristaltic pump

• a>d>b>c

• d>b>c>a

• b>c>d>a

• a>b>c>d

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