Dipotassium peroxodisulphate

Water solubility

Link to relevant study record(s)

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 for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

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.