Manganese dioxide

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 September 2008

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: A non-GLP study conducted to sound scientific principles with a sufficient level of detail to assess the quality of the submitted data.

Qualifier:

no guideline followed

Principles of method if other than guideline:

A standard method using a Coulter LS particle size analyser was used. The model was an optical model Fraunhofer (PIDS included). The pre-treatment consisted of agitation of the sample with 30 ml TPPS (5%) for 2 minutes at 500 rpm. The run length was 65 seconds with pump speed set to 51, obscuration 25% and PIDS obscuration at 97%. The fluid used was water.

GLP compliance:

not specified

Type of method:

Laser scattering/diffraction

Type of distribution:

volumetric distribution

Percentile:

D50

Mean:

ca. 2.068 µm

Remarks on result:

other: No source field for Standard deviation.

No.:

#1

Size:

< 100 µm

Distribution:

> 100 %

No.:

#2

Size:

< 8 µm

Distribution:

> 75 %

Please see attached report for tabulated results.

Conclusions:

The particle size distribution test indicates that 100% of the substance has particles with a diameter up to 64.0 µm; the median particle size of the substance was determined to be 2.068 µm. More specifically, 83.4 % of particles were up to 12.00 µm, 75.1 % of particles were up to 8.00 µm, and 61.0 % of particles were up to 4.00 µm in diameter.

Executive summary:

The particle size distribution of the test material was investigated following a standard method using a Coulter LS particle size analyser . The model was an optical model Fraunhofer (PIDS included). The pre-treatment consisted of agitation of the sample with 30 mL TPPS (5%) for 2 minutes at 550 rpm. The run length was 65 seconds with pump speed set to 51, obscuration 8% and PIDS obscur at 59%. The fluid used was water.

The particle size distribution test indicates that 100% of the substance has particles with a diameter up to 64.0 µm; the median particle size of the substance was determined to be 2.068 µm. More specifically, 83.4 % of particles were up to 12.00 µm, 75.1 % of particles were up to 8.00 µm, and 61.0 % of particles were up to 4.00 µm in diameter.

Description of key information

61% of particles ≤ 4.0 µm, 75.1% of particles ≤ 8.0 µm; 83.4% of particles ≤ 12.0 µm; 100% of particles ≤ 64.0 µm; Coulter LS particle size analyser (volumteric distribution) (2008)

Additional information

The particle size distribution test indicates that 100% of the substance has particles with a diameter up to 64.0 µm; the median particle size of the substance was determined to be 2.068 µm. More specifically, 83.4 % of particles were up to 12.00 µm, 75.1 % of particles were up to 8.00 µm, and 61.0 % of particles were up to 4.00 µm in diameter.