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EC number: 234-919-5 | CAS number: 12040-43-6
Nanomaterial specific surface area
Administrative data
- Endpoint:
- nanomaterial specific surface area
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 013
- Report date:
- 2013
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- ISO 9277 Determination of the specific surface area of solids by gas adsorption - BET method
- Version / remarks:
- 2010
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- (Landesamt für Umw elt-, Wasserw irtschaft und Gew erbeaufsicht, Rheinland-Pfalz)
- Type of method:
- BET
Test material
- Reference substance name:
- Silicic acid, aluminum magnesium sodium salt
- EC Number:
- 234-919-5
- EC Name:
- Silicic acid, aluminum magnesium sodium salt
- Cas Number:
- 12040-43-6
- Molecular formula:
- Na(0.017-1.739)Mg(0.008-0.823)Al(0.002-0.2473)SiO(2.018-3.837)
- IUPAC Name:
- aluminium(3+) magnesium(2+) sodium tris(oxosilanebis(olate))
- Test material form:
- solid: particulate/powder
- Remarks:
- migrated information: powder
Constituent 1
Data gathering
- Instruments:
- Quantachrome Poremaster 60-GT
Quantachrome Autosorb-3
Results and discussion
Specific surface area
- Key result
- Specific Surface Area:
- 57.9 m²/g
Any other information on results incl. tables
Measured BET surface area: 57.9 m²/g.
It must be notified thet the empirically determined specific surfce area, according to George W. Sears, jr., is ten times higher than the surface determined via BET analysis.
Expert judgement:
The difference between the BET surface area (57.9 m²/g) and the specific surface area (588.6 m²/g) by titration is caused by interaction of the sodium hydroxide with aluminium ions in the substance. This phenomen was unexprected and will require a different set-up of the titration which should include a metal analysis, e.g. solved aluminium.
Applicant's summary and conclusion
- Conclusions:
- Specific surface area = 57.9 m²/g
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