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Physical & Chemical properties

Water solubility

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Endpoint:
water solubility
Type of information:
other: experimental study on hydrolysis product Boric acid
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Deviations:
not specified
GLP compliance:
yes
Type of method:
flask method
Water solubility:
49.2 g/L
Temp.:
20 °C
pH:
3.7
Details on results:
Preliminary solubility test
The estimated water solubility is approximately 8.29 g/L. This value means that the shake-flask method had to be applied. Because of the theoretical water solubility (47 g/L) the water solubility test was performed using the theoretical value.
The mean value of the water solubility of Test 1, 2 and 3 is 49.20 ± 0.35 g/L.

Solubility (shake flask method): Test number, stirring time, Tyndall value and the water solubility of the test substance at 20 ºC:

Test

number

Stirring time

(h)

pH

Tyndall

Water solubility

(g/L)

1

24

3.75

0.0020 (0.0018)

48.86

2

48

3.54

0.0031 (0.0020)

49.57

3

72

3.98

0.0022 (0.0021)

49.16

The value between parentheses is Tyndall value of the blank.

Conclusions:
The water solubility of the test substance was 49.20 ± 0.35 g/L at 20.0 ± 0.5 ºC.

Interpretation of results: very soluble (> 10000 mg/L).
Endpoint:
water solubility
Type of information:
other: experimental study on hydrolysis product n-Butanol
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Qualifier:
according to guideline
Guideline:
other: no data
Principles of method if other than guideline:
The information does not come from a test report and the minimum fields cannot be filled in.
GLP compliance:
not specified
Type of method:
other: no data
Key result
Water solubility:
77 g/L
Temp.:
20 °C
Remarks on result:
other: pH unknown
Conclusions:
77 g/L at 20°C
Executive summary:

According to the 'Handbook of Environmental Fate and Exposure Data for Organic Chemicals, Volume II, Solvents', the water solubility of Tributyl borate is 77 g/L (at 20°C).

No further experimental details are reported in the handbook.

Endpoint:
water solubility
Type of information:
other: experimental study on hydrolysis product n-Butanol
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: data from well documented publication
Reason / purpose for cross-reference:
reference to same study
Qualifier:
equivalent or similar to guideline
Guideline:
EPA OPPTS 830.7860 (Water Solubility Generator Column Method)
Principles of method if other than guideline:
Details of the generator column:
- It consists of a 20-cm section of 6-mm o.d. Pyrex tubing joined to a short section of 9-mm o.d. Pyrex tubing. The 6-mm o.d. section of the column was packed with 100-120 mesh Chromosorb W-HP (solid support) which was held in place by two plugs of silanized glass wool. The column was thermostated at 25.0 ± 0.1 °C by pumping water from a constant-temperature bath through a jacket enclosing column.
- The column was coated with a liquid solute by pulling approximately 2 mL of the liquid through the clean, dry support with gentle suction.
- The aqueous phase of the solute was generated by pumping water into the inlet of the coated generator column either by using a minipump or by means of a water reservoir using compressed air at 5 psi.
- Analysis of the aqueous phase from the pure solute coated column yielded the aqueous solubility.
GLP compliance:
not specified
Type of method:
other: Generator Column Method
Water solubility:
63.3 g/L
Temp.:
25 °C
Remarks on result:
other: pH unknown
Details on results:
The reported water solubility is an average of at least three measurements.
Conclusions:
63.2 g/L at 25°C
Executive summary:

According to a well documented publication (Tewari Y.B. et al, 1982), the water solubilty of Tributyl borate is 63.2 g/L (at 25°C). The measurement was performed with a modified Generator Column Method.

Description of key information

Study scientifically not necessary because tributyl borate is rapidly hydrolyzed to boric acid and n-butanol in the presence of water:

- water solubilty of boric acid: 49.2 g/L (at 20°C)

- water solubilty of n-butanol: 77 g/L at 20°C (handbook data) and 63.2 g/L at 25°C (data from publication); key value (arithmetic mean of the two available values) ca. 70 g/L at 20°C

Key value for chemical safety assessment

Water solubility:
70 g/L
at the temperature of:
20 °C

Additional information