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Physical & Chemical properties

Water solubility

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Description of key information

The water solubility of dipotassium peroxodisulfate was determined at approximately 52.77 g/L at 20 °C using the shake-flask method for the performance of the main test. Thus, it was considered very soluble. This value is supported by the information obtained from published data (ca. 60 g/L at 25 °C).

Key value for chemical safety assessment

Water solubility:
52 770 mg/L
at the temperature of:
20 °C

Additional information

Based on published data, the following results were obtained for water solubility of dipotassium persulfate: 60 g/L (25 °C) (OECD-SIDS Report, 2005). As dipotassium persulfate was revealed as an outlier – compared to the other substances of the persulfate category, for which the values for water solubility were in the same range – an additional experimental determination was performed for dipotassium persulfate: The test was performed according to EU method A.6 applying the shake-flask method. The water solubility of dipotassium persulfate was determined at ca. 52.77 g/L at 20 °C. Thus, it was considered very soluble. As the experimental result and the value obtained from published data (60 g/L) are comparable, the hypothesis of dipotassium persulfate being an outlier concerning was verified. Thus, the mean value of diammonium- and disodium persulfate was used for risk assessment.