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other: unpublished study report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:
The 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:
Carbon (coal) Calibration standard 76 m2/g (± 2)
Reproducibility:
no data

Results and discussion

Specific surface area
Key result
Specific Surface Area:
81.9 m²/g
Remarks on result:
other: no data on st. dev.

Applicant's summary and conclusion

Conclusions:
The SSA of test substance was determined to be 82 m²/g