Di-tert-butyl sec-butylidene diperoxide

Water solubility

Link to relevant study record(s)

Reference

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

GLP compliance:

no

Type of method:

other: Slow-stirring method

Remarks:

Acc to the Techn REACH Guidance the use of the slow-stirring method is appropriate for org. test subst with low solubility (<0.01 g/l), like mobile oils or liquids. From literature it is known that WS of the test subst will be << 0.01 g/l and is liquid.

Specific details on test material used for the study:

Chemical name: Di-tert-butyl sec-butylidene diperoxide
Trade name: Trigonox D-C50
CAS number: 2167-23-9
Batch/lot no.: 1211442406
Composition: See CoA
Water solubility: 0.7 – 2 mg/L, calculated
Best before: 01-12-2022
Storage until required: 5°C (refrigerator)

Key result

Water solubility:

8.3 mg/L

Conc. based on:

test mat.

Loading of aqueous phase:

50 mg/L

Incubation duration:

96 h

Temp.:

20 °C

pH:

7

Concentration test substance at different time points

Sample name	Time period hrs	Final conc. µg/L	Avg conc. µg/L	Difference %
Erlenmeyer 1 A	24	1505	1421	-
Erlenmeyer 1 B	24	1337
Erlenmeyer 2 A	48	8413	8544	83.4
Erlenmeyer 2 B	48	8675
Erlenmeyer 3 A	72	8138	8386	-1.9
Erlenmeyer 3 B	72	8634
Erlenmeyer 4 A	96	8036	8050	-4.2
Erlenmeyer 4 B	96	8063
	AVG total (48, 72 and 96 hrs)		83267	µg/L
	To be reported		8.3	mg/L

Conclusions:

The determined result for water solubility was an average result for the time points 48, 72 and
96 hours and was calculated to be 8.3 mg/L. The result of the 24 hour time point differed more
than 15% from the next time point and was therefore not included in the average calculation.
The pH value of the samples, taken at the different time points, was measured with pH indicator
strips to be 7. The temperature at which the test was conducted varied from 19.7 – 20.5 °C, this is within
the set quality criteria of 20 ± 0.5°C.

Executive summary:

The water solubility of Di-tert-butyl sec-butylidene diperoxide was determined in accordance

with OECD guideline 105 at a temperature of 20.0 ± 0.5°C. The data on water solubility

represent the saturation mass concentration of the test substance in water.

The determined final result for water solubility of Di-tert-butyl sec-butylidene diperoxide was

8.3 mg/L.

Description of key information

The water solubility is measured as 8.3 mg/L @ 20 oC

Key value for chemical safety assessment

Water solubility:

8.3 mg/L

at the temperature of:

20 °C