Registration Dossier
Registration Dossier
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EC number: 209-599-5 | CAS number: 587-26-8
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:
- 02 Jun 2006
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP-Guideline 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)
- Remarks:
- Swiss federal office of public health, Bern, Switzerland
- Type of method:
- ring method
- Surface tension:
- 66.6 mN/m
- Temp.:
- 20.5 °C
- Conc.:
- 1.03 g/L
- Remarks on result:
- other: Nominal value: 90% of saturation concentration (see details on methods)
Reference
Determination of surface tension:
Time expired (hours:min) |
Temperature (°C) |
Surface tension (mN/m) |
|||
measured |
Mean value calculated from the bold values (sigma*) |
Mean value corrected for calibration (sigma1) |
sigma1corrected for Harkins-Jordan (sigma) |
||
First sample |
|||||
00:32 |
20.5 |
64.5 |
64.22 |
66.21 |
65.71 |
00:33 |
20.5 |
64.4 |
|||
00:34 |
20.5 |
64.3 |
|||
00:35 |
20.5 |
64.1 |
|||
00:36 |
20.5 |
64.1 |
|||
00:37 |
20.5 |
63.9 |
|||
Second sample |
|||||
00:35 |
20.5 |
66.2 |
65.78 |
67.83 |
67.53 |
00:36 |
20.5 |
65.9 |
|||
00:37 |
20.5 |
65.8 |
|||
00:38 |
20.5 |
65.7 |
|||
00:39 |
20.5 |
65.6 |
|||
00:40 |
20.5 |
65.5 |
|||
Mean value from both samples: sigma = 66.6 mN/m
With
sigma* . phib= sigma1
phib= calibration factor = 1.0311 for Milli Q water
and
sigma1. Fc= sigma
Fc= factor for correction acc. to Harkins-Jordan (1930), J. Amer. Chem. Soc 52: 1751
= 0.992 for 66.21 mN/m and 0.996 for 67.83 mN/m
Conclusion: The test item is not a surface active substance.
Description of key information
66.6 mN/m at 20.5 °C (90 % of saturation concentration)
Key value for chemical safety assessment
Additional information
The surface tension of Lanthanum carbonate was determined using a ring tensiometer according to OECD 115 under GLP conditions (Weissenfeld 2006). An aqueous solution was prepared by weighing 206.61 mg of test item in a 200 mL flask. This flask was then filled up to the mark with Milli-Q-Water. The mixture was stirred for about 24 hours, centrifuged for 5 minutes, filtrated, and diluted with 1/10 (v/v) mark with Milli-Q-Water. Recordings of surface tension were done on two samples of the test item solution, with six measurements per sample.
The surface tension of dilanthanum tricarbonate in water was determined to be 66.6 mN/m at 20.5 °C. Based on this result, the test item is not a surface active substance.
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