Registration Dossier
Registration Dossier
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EC number: 918-984-3 | CAS number: -
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:
- 2008-11-25 to 2010-06-28
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study performed following OECD guideline GLP study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- ring method
- Surface tension:
- 30.8 mN/m
- Temp.:
- 20.2 °C
- Conc.:
- 1 g/L
- Conclusions:
- The mean surface tension of the test item at 1 g/L in demineralized water was 30.8 ± 0.6 mN/m (corrected value).
The test item was considered as surface-active in our experimental conditions. - Executive summary:
SURFACE TENSION
In compliance with Commission Directive 92/69/EEC, Commission Regulation (EC) No. 440/2008 EC A5 method (2008) and OECD Guideline No. 115 (1995)
The mean surface tension of the test item at 1 g/L in demineralized water was 30.8 ± 0.6 mN/m (corrected value).
The test item was considered as surface-active in our experimental conditions.
Reference
Results
1. With demineralized water
Mean surface tension of water 78.9 ± 0.2 mN/m
Calibration factor φb = (σo / σg) = 0.922
Where σo is 72.75 mN/m (surface tension of water at 20.0 °C ; value given in the literature).
σg is 78.9 mN/m (measured surface tension of demineralized water at 20.0 °C).
2. With test item solution
A quantity of 0.502 g was weighed into a 500-mL volumetric flask. The volume was made up with demineralized water. The solution was manually stirred.
| Assay No. 1 | Assay No. 2 | Assay No. 3 | |||||
| Temperature (°C) | 20.2 | Temperature (°C) | 20.2 | Temperature (°C) | 20.2 | ||
| Time | Surface tension (mN/m) | Time | Surface tension (mN/m) | Time | Surface tension (mN/m) | ||
| T0 | 36.2 | T0 | 37.9 | T0 | 37.7 | ||
| T0 + 3 min | 35.9 | T0 + 3 min | 35.3 | T0 + 3 min | 34.7 | ||
| T0 + 7 min | 36.0 | T0 + 6 min | 35.6 | T0 + 6 min | 36.5 | ||
| T0 + 23 min | 35.5 | T0 + 9 min | 35.1 | T0 +10 min | 37.1 | ||
| T0 + 25 min | 35.4 | T0 + 14 min | 37.0 | ||||
| T0 + 27 min | 35.9 | ||||||
| T0 + 30 min | 36.0 | ||||||
Remark: Due to the foam created by the test item in solution, a variation of the results was observed and 30 minutes were needed to obtain a stable value.
3. Calculation
| Assay | Measurements (mN/m) | Average corrected value using φb (mN/m) | Average corrected value according to Harkins & Jordan table (mN/m) |
| State of equilibrium | |||
| 1 | 35.4 | 32.7 | 30.8 |
| 2 | 35.1 | ||
| 3 | 36.0 | ||
| Mean | 35.5 | ||
Description of key information
The mean surface tension of the test item at 1 g/L in demineralized water was 30.8 ± 0.6 mN/m (corrected value).
The test item was considered as surface-active in our experimental conditions.
Key value for chemical safety assessment
- Surface tension:
- 30.8
- in mN/m at 20°C and concentration in mg/L:
- 1 000
Additional information
In study conducted according Commission Directive 92/69/EEC, Commission Regulation (EC) No. 440/2008 EC A5 method (2008) and OECD Guideline No. 115 (1995), the surface tension of PROTEOL APL was determined to be 30.8 ± 0.6 mN/m (corrected value) at 1 g/L in demineralized water.
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