Registration Dossier
Registration Dossier
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EC number: 201-196-2 | CAS number: 79-33-4
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:
- 2008-12-02 to 2008-12-19
- 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)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.5 (Surface Tension)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- OECD harmonised ring method
- Specific details on test material used for the study:
- - Appearance: clear colourless liquid
- Purity: 92.8%
- Batch No.: 0712002519
- Storage: at room temperature in the dark - Key result
- Surface tension:
- 70.7 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Conclusions:
- Lactic acid is not a surface active substance.
- Executive summary:
The OECD harmonized ring method was used for the determination of the surface tension of lactic acid 93 % aq. The surface tension of a test solution at a concentration of 1 g/L and at 20.0 °C was 70.7 mN/m. According to this, the test substance is considered not to be surface active.
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 1996
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Company data with limited reporting
- GLP compliance:
- no
- Type of method:
- other: Krüss tensiometer
- Surface tension:
- 44.9 mN/m
- Temp.:
- 25 °C
- Conc.:
- 79 other: % w/w
- Surface tension:
- 47.3 mN/m
- Temp.:
- 25
- Conc.:
- 20 other: % w/w
- Conclusions:
- Surface tension of a concentrated solution is not a relevant property.
- Executive summary:
Based on the retrieved results, the surface tension of a concentrated solution of L-lactic acid is not a relevant property.
- Endpoint:
- surface tension
- Type of information:
- other: handbook data
- Adequacy of study:
- supporting study
- Study period:
- 1971
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- not reported
- GLP compliance:
- no
- Type of method:
- other: other
- Surface tension:
- 46 mN/m
- Temp.:
- 25 °C
- Conc.:
- 90 g/L
- Conclusions:
- The surface tension of L-(+)-lactic acid is 46 mN/m at 25 °C.
- Executive summary:
According to Holten the surface tension of L-(+)-lactic acid is 46 mN/m at 25 ° at a concentration of 90 g/L.
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- 2008
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Company data with limited reporting
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 115 (Surface Tension of Aqueous Solutions)
- Deviations:
- yes
- Remarks:
- Test substance concentration exceeds the maximum concentration allowed by the guideline.
- GLP compliance:
- no
- Type of method:
- other: Kruss tensiometer model K8 ring K610
- Surface tension:
- 58.9 mN/m
- Temp.:
- 22 °C
- Conc.:
- 10 g/L
- Conclusions:
- The surface tension of a 1% solution is not compliant with the test guideline OECD 115, requiring a maximum concentration of 1 g/L.
- Executive summary:
The surface tension of a 1% solution is not compliant with the test guideline OECD 115, requiring a maximum concentration of 1 g/L.
Referenceopen allclose all
Description of key information
Lactic acid is not surface active.
Key value for chemical safety assessment
- Surface tension:
- 70.7
- in mN/m at 20°C and concentration in mg/L:
- 1
Additional information
A standardized test conducted according to OECD TG 115 resulted in the determination that a 1 g/L solution of lactic acid in water has a surface tension of 70.7 mN/m. Based on the results, it can be concluded that lactic acid is not a surface active substance.
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