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The Osmotic Potential of Polyethylene Glycol 6000 ¹

^a Department of Botany, University of Georgia, Athens, Georgia 30601, Department of Plant Sciences, University of California, Riverside, California 92502

Osmotic potential (_s) of aqueous solutions of polyethylene glycol 6000 (PEG-6000) was curvilinearly related to concentration. At given concentrations, _s increased linearly with temperature. The effects of concentration and temperature on _s of PEG-6000 solutions differ from those for most salts and sugars and apparently are related to structural changes in the PEG polymer. Measurements of _s with thermocouple psychrometers are more negative than those with a vapor pressure osmometer, with the psychrometer probably giving the more nearly correct _s for bulk solutions. An empirical equation permits calculation of _s from known concentrations of PEG-6000 over a temperature range of 15 to 35 C. Viscometery and gravimetric analysis are convenient methods by which the concentrations of PEG-6000 solutions may be measured.

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