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Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
20 October 2009 – 27 October 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study, according to OECD guideline, report including certificate of analysis.
Qualifier:
according to
Guideline:
OECD Guideline 105 (Water Solubility)
Version / remarks:
July 27th, 1995
Deviations:
no
GLP compliance:
no
Type of method:
flask method
Water solubility:
171 mg/L
Temp.:
20 °C
pH:
8.1

Three sets of samples (in duplicate) were analyzed 24, 48 and 72 hours after weighing of the test substance Trigonox B and addition of water. The concentration of the test substance was quantified using Head-space GC Chromatography. Table 6.1 presents a summary of the three sets of tests performed. The amount of test substance weighed at the start of the test, the pH of the dilutions and the calculated results after analysis are all displayed in Table 1.

 

Table 6.1: Analysis results of Trigonox B water solubility

 

Test time

(hours after weighing)

Amount of test substance in water

(mg/L)

Intake water

(g)

pH

Trigonox B concentration

(mg/kg)

average

(mg/kg)

24

859 – 813

10.67 – 9.96

8.3

170 – 169

170

48

949 – 842

10.09 – 9.89

8.0

179 – 170

175

72

1232 - 1021

10.11 – 10.11

8.1

167 – 171

169

 

Table 6.2: Summary of the results of Trigonox B water solubility

 

Test time
(hours after weighing)

Amount of
test substance

(mg/L)

pH

Solubility (mg/L)

Difference between solubilities (%)*

Average water solubility (mg/L)

24

approx. 800

8.3

170

 

171

48

approx. 900

8.0

175

2.9

72

approx. 1000

8.1

169

3.6

 

* According to the guideline the repeatability of two individual results must be less than 15% before averaging.

Conclusions:
Di-tert-butyl peroxide has a water solubility of 171 mg/L at 20°C and pH 8.1.
Executive summary:

The water solubility of di- tert- butyl peroxide was determined according to OECD test guideline 105. The flask method was used to perform the water solubility test because a literature search and a preliminary study indicated that the water solubility would be >100 mg/l. Head- space gas chromatography was used to determine the concentration of the test substance in water. The average water solubility of di- tert- butyl peroxide in this study was determined to be 171 mg/l.

Description of key information

Di-tert-butyl peroxide has a water solubility of 171 mg/L at 20°C and pH 8.1.

Key value for chemical safety assessment

Water solubility:
171 mg/L
at the temperature of:
20 °C

Additional information

This low solubility is supported by calcualted data.