Organic acid analysis mechanism

[Jeane]

Dear chromatographers,

I hope you can help me:

I need to know the mechanism behind organic acid analysis with cation exchange sulfonated resin (H form).

Is that repulsion? But the mobile phase (sulfuric acid 0,2M) pH is far below pKa value, so acids are not ionized. There's no charge to repulsion.

According columns manuals the mechanism is Ion exclusion and reversed phase, but I don't understand why, either.


Thanks!

[tom jupille]

Look at the second half of this thread from 2-3 weeks ago:

http://www.sepsci.com/chromforum/viewto ... highlight=

[Jeane]

Thanks, I' m looking for some of your articles too.


Jeane