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Ion Chromatography-Adjustment of Flowrate through the column

Discussions about HPLC, CE, TLC, SFC, and other "liquid phase" separation techniques.

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Hi everybody,

is it generally considered a good practice to adjust the flowrate through a column (e.g.: the CS12 with DX500 that we use) from the working one of 1 ml/min down to e.g.: 0,25 mL/min and let it work overnight with eluent running, so as to have the insturment equilibrated faster in the morning?

Have there been any problems observed with a practice like that (e.g.: accumulation of eluent ions, due to the slow flowrate, over the exchange sites in the column that would cause problems as not all sites would perhaps be available any longer)?

And, if the answer to the previous question is yes, what would then be a method to recover the column performance? (if there's any kind of risk related to a practice like that, i'd like to know what would have to be done in order to overcome any possibly occuring problems before implementing it).

thanks in advance,

Vangelis

The bet way to answer this is a german word: Jain.
This is a combination of yes and no.
We do have to groups of users. The first says: "Reduced flow overnight is the best". The other group says: "Turn of the pump overnight is the best".
In both groups you wil find people saying that the otherway round they got a lot of problems.
Even in our labs we do find both groups.
Dr. Markus Laeubli
Manager Marketing Support IC
(retired)
Metrohm AG
9101 Herisau
Switzerland
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