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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14 September 2017 – 04 January 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
63.4 - <= 71.6 mN/m
Temp.:
20 °C
Conc.:
1 g/L

Solutions of 1 g/L and 1 mg/L were prepared and observed to become cloudy. Both solutions were then left over 60 hours and after this period, the solution was found to be clear. Another 1g/L was then prepared and sonicated. After approximately 3 hours the sample had gone into solution. Measurements were then taken.

A second solution was prepared in the same way and sonicated until the solution was clear (approximately 3 hours 5 minutes).

Due to the extended solubilisation time and the difference in readings between the two test then a range has been reported for the surface tension rather than a mean.

Result : 63.4 - 71.6 mN.m-1 (range)

Table 1: Surface Tension Data

Solution Age (minutes)

Surface Tension Reading (mN/m)

Run 1

0

61.3

30

62.0

60

62.5

100

62.7

140

62.7

155

63.4

170

63.1

180

63.4

190

63.4

Run 2

0

70.2

30

71.0

80

71.4

110

71.4

135

71.5

155

71.5

185

71.6

205

71.6

Conclusions:
The surface tension of the test item was determined to be 63.4 - 71.6 mN/m.
Executive summary:

The surface tension of dilithium tetraborate was determined to be 63.4 - 71.6 mN/m using the ring method in accordance with EU Method A5.

Description of key information

The surface tension of dilithium tetraborate was determined to be 63.4 - 71.6 mN/m using the ring method in accordance with EU Method A5.

Key value for chemical safety assessment

Surface tension:
71.6
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information