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Physical & Chemical properties

Particle size distribution (Granulometry)

Administrative data

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
7 Feb 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Test guidelineopen allclose all
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:
not specified
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Deviations:
not specified
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
Deviations:
not specified
GLP compliance:
yes (incl. QA statement)
Remarks:
Hess. Ministerium für Umwelt, Energie, Landwirtschaft und Verbraucherschutz, Mainzer Straße 80 D65189 Wiesbaden, Germany
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution

Test material

Constituent 1
Chemical structure
Reference substance name:
Disodium 4,5-dihydroxybenzene-1,3-disulphonate
EC Number:
205-741-5
EC Name:
Disodium 4,5-dihydroxybenzene-1,3-disulphonate
Cas Number:
149-45-1
Molecular formula:
C6H6O8S2.2Na
IUPAC Name:
disodium 4,5-dihydroxybenzene-1,3-disulphonate

Results and discussion

Particle sizeopen allclose all
Key result
Percentile:
D10
Mean:
14.2 µm
Remarks on result:
other: std. dev. not available
Key result
Percentile:
D50
Mean:
37.7 µm
Remarks on result:
other: std. dev. not available
Key result
Percentile:
D90
Mean:
80.8 µm
Remarks on result:
other: std. dev. not available

Any other information on results incl. tables

Individual Results

Two test series of 3 measurements each were performed with the test item.

 

Test series 1 :

D10:      14.1 µm               

D50:      37.8 µm (Median diameter)

D90:      81.4 µm               

 

Test series 2 :

D10:      14.2 µm               

D50:      37.6 µm (Median diameter)

D90:      80.1 µm               

 

Average:

D10:      14.2 µm

D50:      37.7 µm (Median diameter)

D90:      80.8 µm

Final Results

The test item AF-378 has a median particle size of D50 = 37.7 µm, which was determined by laser diffraction measurement according to OECD Test Guideline 110 (1981), ISO 13320 (2009) and EPA OCSPP Guideline 830.7520 (1996).

Applicant's summary and conclusion