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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2010-03-15 to 2010-03-19
Reliability:
1 (reliable without restriction)
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
EU Method A.6 (Water Solubility)
Version / remarks:
92/69/EEC
Deviations:
no
Principles of method if other than guideline:
NA
GLP compliance:
not specified
Type of method:
flask method
Water solubility:
ca. 52.77 g/L
Temp.:
20 °C
pH:
ca. 3.8
Details on results:
NA

Water solubility test results for dipotassium persulfate were as follows:

         dipotassium persulfate (g/L, 20 °C)        pH (20 °C)
Test Nr.  Vessel-1  Vessel-2  Vessel-3   Vessel-1  Vessel-2  Vessel-3
 1  52.9  52.8  53.0  3.78  3.79  3.77
 2 52.7  52.9   52.8 3.80  3.78  3.80
 3 52.5  52.7   52.9 3.82   3.81  3.76
4 53.1 52.8  52.6  3.77  3.78  3.83 
5 52.8  52.5  52.7  3.79 3.76  3.79
 Average 52.8 52.7  52.8 3.79  3.81   3.80
Conclusions:
Interpretation of results (migrated information): very soluble (> 10000 mg/L)
The water solubility of dipotassium persulfate was determined at approximately 52.77 g/L at 20 °C using the shake-flask method for the performance of the main test. Thus, dipotassium persulfate was considered very soluble.
Executive summary:

The water solubility of dipotassium persulfate was determined at ca. 52.77 g/L at 20 °C . The results of the main test were as follows:

       dipotassium persulfate (g/L, 20 °C)        pH (20 °C)
Test Nr.  Vessel-1  Vessel-2  Vessel-3   Vessel-1  Vessel-2  Vessel-3
 1  52.9  52.8  53.0  3.78  3.79  3.77
 2 52.7  52.9   52.8 3.80  3.78  3.80
 3 52.5  52.7   52.9 3.82   3.81  3.76
4 53.1 52.8  52.6  3.77  3.78  3.83 
5 52.8  52.5  52.7  3.79 3.76  3.79
 Average 52.8 52.7  52.8 3.79  3.81   3.80

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.