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Potassium thiosulfate has a low potential to partition into air based on the low vapour pressure of ionic solutions and does not sublime.

Under environmental relevant conditions, potassium thiosulfate readily dissociates into thiosulfate anions and potassium cations in aqueous solution. Thiosulfates are not stable under typical environmental conditions. Environmental transformation reactions include oxidation and reduction depending on the environmental conditions resulting in sulfides and sulfates. Thus, hydrolysis and photodegradation are not relevant as potassium thiosulfate dissociates rapidly and is transformed e.g. by oxidation, reduction, speciation, precipitation in environmental solutions.

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