Pentapotassium bis(peroxymonosulphate) bis(sulphate)

Water solubility

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2007-02-14 - 2007-07-02

Reliability:

1 (reliable without restriction)

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

Principles of method if other than guideline:

NA

GLP compliance:

yes

Type of method:

flask method

Key result

Water solubility:

>= 25 - <= 30 other: % (w/v)

Temp.:

22 °C

pH:

4

Key result

Water solubility:

>= 25 - <= 30 other: % (w/v)

Temp.:

22 °C

pH:

7

Key result

Water solubility:

>= 25 - <= 30 other: % (w/v)

Temp.:

22 °C

pH:

9

Details on results:

The solubility is reported as greater than the last concentration at which it is dissolved completely, but less than the concentration at which dissolution is incomplete.

solubility at pH 4, 7 and 9: 250 -300 g/L

Conclusions:

very soluble (> 10000 mg/L)
The solubility of the test substance KMPS P-16 was determined to be 25-30 % at 22 °C. This range was found at the pH values 4, 7 and 9.

Executive summary:

The solubility of the test substance KMPS P-16 was determined to be 25-30 % (250 -300 g/L) at 22 °C. This range was found at the pH values 4, 7 and 9. The solubility is reported as greater than the last concentration at which it is dissolved completely, but less than the concentration at which dissolution is incomplete.

Reference 2

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2001-02-22 - 2002-01-17

Reliability:

1 (reliable without restriction)

Qualifier:

according to guideline

Guideline:

EU Method A.6 (Water Solubility)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

no

Principles of method if other than guideline:

NA

GLP compliance:

yes (incl. QA statement)

Type of method:

flask method

Key result

Water solubility:

>= 357 - <= 370 g/L

Temp.:

20 °C

pH:

>= 1.4 - < 1.6

Details on results:

mean = 364 g/L (stamdard deviation: 4.7 g/L)

three separate tests measured two times each

Conclusions:

Interpretation of results: very soluble (> 10000 mg/L)
The water solubility of the test substance Oxone® Monopersulfate compound was determined to be 364 g/L at 20°C and pH 1.4 - 1.6.

Executive summary:

The overall mean water solubility of the test substance Oxone ® Monopersulfate compound was determined to be 364 g/L at 20°C and pH 1.4 - 1.6. Three separate test were carried out, each measured two times.

Description of key information

In an experimental study (see: D_K1WaterSol DPT557/012940 key; Doc. No. 119-001) the overall mean water solubility of the test substance was determined to be 364 g/L (> 28%) at 20°C and pH 1.4 - 1.6 This is carried out through placing an excessive amount of triple salt solution, and the solubility is determined by titration of KHSO5 species in solution. In a different experiment (see: B_K1Watersol 3280-27 key; Doc. No. 119-003) the solubility of the test substance was determined by visual inspection to be 297-357 g/l (25-30 %) at 22 °C. This range was found at the pH values 4, 7 and 9.

The difference in values represents the solubility of the more soluble single salt KHSO5 and not the solubility of the KMPS triple salt.  In water the anions of each constituent of the triple salt have independent solubility.  The overall solubility is dependent on the least soluble anion which represents 297-357 g/l while the most soluble anion KHSO5 has a solubility of 364 g/L. Nevertheless, these two experimental results are in good accordance, the 364g/L was choose as the key value for the CSA as this could represent the worst case situation. Solubility increases slightly with decreasing pH.

Key value for chemical safety assessment

Water solubility:

364 000 mg/L

at the temperature of:

20 °C