How to use surfactant in diluent

I am diluting liquid samples in H2O with 2% Nitric 0.5 %Hydrochloric acid. However, they are not evenly going into diluent.
Perhaps surfactant will help.
I would appreciate any suggestions which surfactant and how much to use. And how to adjust acidity o the diluent

 

 

P.S.

Sorry English is not my native tongue, so typos it possible.

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