Registration Dossier

Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Deviations:
no
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 187: Particle Size Analysis by Laser Diffraction
Deviations:
no
Principles of method if other than guideline:
Due to the corrosiveness of the test item and due to the small fraction below 1000 µm the determination of the particle size distribution with laser diffraction was not possible. The test item was sieved over a 1000 µm sieve and inspected under a microscope.
GLP compliance:
yes (incl. QA statement)
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
No.:
#1
Size:
>= 200 - < 1 000 µm
Distribution:
27.5 %

The test item consisted of many coarse particles. Therefore, 194.5 g of the test item was sieved over a sieve with a mesh size of 1000 µm at ambient temperature under inert atmosphere. After sieving, 53.4 g passed the sieve. This corresponds to a share < 1000 µm of 27.5 % (w/w).

The test item was corrosive to the metal of the sieve. As main parts of the laser diffraction apparatus are of metal and due to the small fraction below 1000 µm, no further determination of the particle size distribution by laser diffraction was performed.

The share with a particle size < 1000 µm was inspected optically under a microscope (Carl Zeiss Microscope Axiolab drb KT, magnification: 100x). The portion with a particle size < 1000 µm consisted of yellow crystalline particles which appeared rod shaped or irregular shaped and partially agglomerated. The particle size was approximately ≥ 200 µm.

Conclusions:
After sieving of the test item over a 1000 µm sieve, 27.5 % (w/w) of the test item passed through the sieve. The portion with a particle size < 1000 µm was inspected optically and the particle size was determined to be approximately ≥ 200 µm.
Executive summary:

The particle size distribution of Tetrachlorogold (III) acid hydrate was determined according to OECD guideline 110. This study is reliable without restrictions as it is GLP-compliant and was conducted according to a standard guideline.

The test item was sieved over a 1000 µm sieve and 27.5 % (w/w) of the test item passed through the sieve. Due to the corrosiveness of the test item and due to the small fraction below 1000 µm the determination of the particle size distribution with laser diffraction was not possible. The portion with a particle size < 1000 µm was inspected optically under a microscope and the particle size was determined to be approximately ≥ 200 µm.

 

Description of key information

The test item was sieved over a 1000 µm sieve and 27.5 % (w/w) of the test item passed through the sieve. Due to the corrosiveness of the test item and due to the small fraction below 1000 µm the determination of the particle size distribution with laser diffraction was not possible. The portion with a particle size < 1000 µm was inspected optically under a microscope and the particle size was determined to be approximately ≥ 200 µm.

Additional information

The particle size distribution of tetrachlorogold (III) acid hydrate was determined according to OECD guideline 110 (Winkler 2016). This study is reliable without restrictions as it is GLP-compliant and was conducted according to a standard guideline.

The test item was sieved over a 1000 µm sieve and 27.5 % (w/w) of the test item passed through the sieve. Due to the corrosiveness of the test item and due to the small fraction below 1000 µm the determination of the particle size distribution with laser diffraction was not possible. The portion with a particle size < 1000 µm was inspected optically under a microscope and the particle size was determined to be approximately ≥ 200 µm.