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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:
Februari 12- September 11, 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study, according to OECD guideline, purity is mentioned.
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 105 (Water Solubility)
Principles of method if other than guideline:
As calculations indicate very low solubility, only nominal 30 ppm suspension is tested.
GLP compliance:
no
Type of method:
flask method
Remarks:
with nominal 30 ppm suspension
Water solubility:
152 µg/L
Remarks on result:
other: At ambient temperature. No pH is mentioned in the report.
Details on results:
The ambient temperature is not further defined.

Time(hr)

µg/L DMHBP

(Uncentrifuged)

µg/L DMHBP

(Centrifuged)

0

2,840,000; 616,000; 570,000

159,128,169

1

5770; 5700; 17,100

179, 159, 157

2

5990; 5100; 3400

193, 160, 191

3

5780; 4590; 8650

201, 176, 202

The large difference between the values for the centrifuged and uncentrifuged samples at 0, 1, 2 and 3 hours indicates a significant excess of undissolved material over the time course of the study. Therefore, saturation was maintained over the 3 -hour time window. Note that the amount of material for the centrifuged values appears to increase slightly over the 3 -hour time period. The increase could be due to a slight change in temperature over time( the system was not maintained at a constant temperature) or to hydrolysis of the testsubstance releasing degradation products (such as TBA) wich could have acted as cosolvents to dissolve more of the parent compound. The reported solubility was determined by using linear regression to find the intercept of the concentration vs time function for all samples over three hours.

Conclusions:
Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)
The water solubility of di-tert-butyl 1,1,4,4-tetramethyltetramethylene diperoxide is 152µg/L at ambient temperature.
Executive summary:

The water solubility was determined to be 152 µg/L in purified water under ambient conditions. DMHBP was shown to hydrolyze in water, with a loss of greater than 90% after 24 hours at pH 4, 7 and 9 at a temperature of 50°C. One of the hydrolysis products was identified as tertiary-butyl alcohol.

The water solubility of di-tert-butyl 1,1,4,4-tetramethyltetramethylene diperoxide is 152µg/L at ambient temperature.

Description of key information

The water solubility of di-tert-butyl 1,1,4,4-tetramethyltetramethylene diperoxide is 152µg/L at ambient temperature.

Key value for chemical safety assessment

Water solubility:
152 µg/L

Additional information

The experimental result is supported by calculation on this low level.

See:78-63-7, Water solubility, ACD labs, SS

The calculated water solubility of di-tert-butyl 1,1,4,4-tetramethylene diperoxide is 67µg/L.