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Inorganic salts such as Na2S04) MgS04, and Na3P04 have been reported to form aqueous two-phase systems with polyethylene glycols (PEGs). Recent studies show that the above phenomenon is very general in the sense that a number of inorganic salts, even certain uni-univalent salte, form aqueous two-phase systems with PEG. The relative concentration of various salts to form two-phase systems was found to depend upon the valency and hydration (size) of the ions as well as "specific" interactions of the ions with the polymer. Possible mechanisms leading to the formation of PEG-inorganic salt-water aqueous two-phase systems are discussed.

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