HPLC separation of organic acids

hi,

I want to separate organic acids using Rezex Organic acid column. Mobile phase is 0.005N H2SO4. Individual injection gives very good results. However, when acid mixture is injected, we are not getting separated peaks. I need help to separate mixture of organic acids.

Please help.

I did not find the right solution from the internet.

References:-
www.chromforum.org/viewtopic.php?t=36751
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Thanks