PEG solutions

Virginia Berg bergv at CHAOS.CNS.UNI.EDU
Tue Mar 16 15:59:36 EST 1999


There is a way to use PEG solutions of various concentrations to control the
relative humidity.  I want to hold some stuff at a particular RH/water
potential value by having it sit in a sealed container whose atmosphere is
at equilibrium with the PEG solution below.  (Actually, I want to do a bunch
of these at different RH/water potential values.)  Saturated salt solutions
don't give the values I want.  Can anyone point me to the right recipe?

Thanks.

--Gini Berg

To me it seems that all sciences are vain and full of errors that are not
born of experience, mother of all certainty.
--Leonardo da Vinci (1452-1519)

Virginia Berg  (bergv at uni.edu)
Biology Department 0421
University of Northern Iowa
Cedar Falls, IA 50614
(319) 273-2770 (phone), 273-2893 (fax)
http://www.uni.edu/berg




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