Registration Dossier
Registration Dossier
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EC number: 233-135-0 | CAS number: 10043-01-3
Surface tension
Administrative data
Link to relevant study record(s)
- Endpoint:
- surface tension
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- The test substance is aluminium sulphate basic, of formula Al2 (OH)0.16 (SO4)2.92, and not pure alum inium sulphate Al2 (SO4)3; however, according to the notifier, limited basicity may occur in the technical substance. Therefore, the chemical similarity (only 0.8% OH) is considered sufficient for supporting data on the hydrated form, the reference substance for the REACh registration dossier being the anhydrous form.
- Reason / purpose for cross-reference:
- read-across source
- Surface tension:
- 73 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Conclusions:
- Not expected to be surface-active.
- Executive summary:
From analogue, the surface tension of a 1 g/L solution of the 15 - 16 H2O hydrated form is anticipated to be above the cut-off value of 60 mN/m.
- Endpoint:
- surface tension
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 09 March 2010- 04 June 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- This study has been performed according to OECD and EC guidelines and according to GLP principles. Test substance is adequately characterised. Therefore full validation applies.
- 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:
- 73 mN/m
- Temp.:
- 20 °C
- Conc.:
- 1 g/L
- Conclusions:
- Not surface active.
- Executive summary:
The surface tension of aluminium sulphate basic hydrated was investigated according to OECD/EC guidelines, ring method. The mean of five consecutive consistent measurements, at the maximum testing concentration of 1 g/L in double-distilled water and 20°C, was corrected for calibration factor and according to Harkins-Jordan table. The final retained result is 73.0 mN/m.
Referenceopen allclose all
mean of five consistent measurements: 70.2 mN/m (before correction)
calibration factor: 1.04
Description of key information
Aluminium sulphate (anhydrous) is NOT anticipated to be surface-active (from experiment on analogue).
Key value for chemical safety assessment
Additional information
No data is available on the reference substance (anhydrous form), but a reliable experimental study was conducted on analogue, showing a result much above the threshold of 60 mN/m.
Despite the reference anhydrous substance should be tested at a concentration ca twice as done for the hydrated analogue, the margin of safety is considered sufficient for a qualitative assessment. Furthermore, inorganic substances are generally known to have no impact or slightly increase the surface tension of water.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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