Octanol, Butanol, evaporation.

[Гость]

Is there some cosolute (sorbent?)
that would reduce the
rate of subj evaporation
(like salt or PEG for the water)

I've 1-4% solutions of butanol (or octanol)
in water, I need them to release ROH vapours
as slow as possible (T- 20C)
I've tried oil overlay, that does not help.

Thank you!!!