Registration Dossier

Administrative data

Endpoint:
nanomaterial specific surface area
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2012
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
other: unpublished study report
Title:
Unnamed
Year:
2012
Report Date:
2012

Materials and methods

Principles of method if other than guideline:
This test method allow the determination of the specific surface area of substances in powder or in granulate form according to the Brunauer, Emmet and Teller (BET) principle.
GLP compliance:
no
Type of method:
BET
Details on methods and data evaluation:
4.1 Preparing the Instruments
Rinsing: valves 1, 2, 3, and 4 are open (pin has been removed), the blocking valve 5 is locked. Both the adsorption vessels are still on the AREA-Meter. The nitrogen stream is on (20%).

5. Evaluation
The nomographic evaluation is the most simplified way of calculating specific surface areas.
The specific surface area is calculated using four different parameters.

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: nanoform

Data gathering

Instruments:
AREA-Meter II from STRÖHLEIN INSTRUMENTS
Thermostat (300-600K) for 8 Adsorption vessels with rinsing capillaries
Calibration:
Calibration: Carbon (coal) Calibration standard 76 m2/g (± 2)
Reproducibility:
no data

Results and discussion

Specific surface areaopen allclose all
Key result
Specific Surface Area:
43.3 m²/g
Remarks on result:
other: no data on St.dev.
Key result
Specific Surface Area:
68 m²/cm³
Remarks on result:
other: no data on St. dev.

Any other information on results incl. tables

The rel. density value of 1.57 corresponding to endpoint 4.4 is used for the calculation on VSSA.

Applicant's summary and conclusion

Conclusions:
The SSA of test substance was determined to be 43.3 m²/g