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EC number: 410-690-9 | CAS number: 103055-07-8 CGA 184699
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 20 May 1992
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Qualifier:
- according to guideline
- Guideline:
- other: ISO 304 (Surface active agents - Determination of Surface Tension by Drawing up Liquid Films)
- GLP compliance:
- yes
- Type of method:
- plate method
- Key result
- Surface tension:
- 70.1 mN/m
- Temp.:
- 20 °C
- Conc.:
- 10 g/L
- Conclusions:
- The average surface tension of two independent measurements was 70.1 mN/m for a 10 g/L aqueous solution at 20.0 ± 0.2 °C.
- Executive summary:
The surface tension of the test substance was determined using the Wilhelmy plate method in accordance with OECD TG 115 following GLP principles. The average surface tension of two independent measurements was 70.1 mN/m for a 10 g/L aqueous solution at 20.0 ± 0.2 °C.
Reference
RESULTS
DETERMINATION OF THE CORRECTION FACTOR
A correction factor Ob of 0.987 was found. No time dependence of surface tension was observed. The average surface of two independent measurements was 70.1 mN/m for a 10 g/L aqueous solution at 20.0 ± 0.2 °C.
Table 1. Experiment 1: Surface tension by Wilhelmy plate method at 20.0 ± 0.2 °C
Concentration (g/L) |
Minutes |
σ (solution) / mN/m |
σ correction for Ob (mN/m) |
Filtrate of a 10.01 g/L suspension |
0 |
70.4 |
|
|
1 |
70.2 |
|
|
5 |
69.8 |
|
|
10 |
69.3 |
|
|
15 |
69.0 |
|
|
20 |
68.7 |
|
|
25 |
68.4 |
|
|
30 |
68.1 |
|
Average |
|
69.2 |
68.3 |
Table 2. Experiment 2: Surface tension by Wilhelmy plate method at 20.0 ± 0.2 °C
Concentration (g/L) |
Minutes |
σ (solution) / mN/m |
σ correction for Ob (mN/m) |
Filtrate of a 10.00 g/L suspension |
0 |
73.8
|
|
|
1 |
73.8 |
|
|
5 |
73.8 |
|
|
10 |
73.7 |
|
|
15 |
73.7 |
|
|
20 |
73.7 |
|
Average |
|
73.8 |
72.8 |
A Harkins - Jordan correction is required by the test guideline for measurements on aqueous solutions by the ring method. This hydrostatic correction is, however, not necessary when using the Wilhelmy plate method.
Description of key information
Surface tension: 70.1 mN/m for 10 g/L aqueous solution at 20.0 ± 0.2 °C, OECD TG 115, Wilhelmy plate method, Ryser 1992
Key value for chemical safety assessment
- Surface tension:
- 70.1
- in mN/m at 20°C and concentration in mg/L:
- 10 000
Additional information
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