Registration Dossier
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EC number: 214-772-3 | CAS number: 1193-24-4
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- June 2010
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: see 'Remark'
- Remarks:
- The study has been conducted according to CIPAC Method 187 Guideline however the test item is soluble in water therefore a modification of the conditions of the analysis (acidification of the medium to reduce the the solubility of the sample in the dispersing media) was required. The study is considered reliable with some restrictions due to the fact that only one measeure has been performed in dilute hydrochloric acid (pH = 2.0).
- Qualifier:
- according to guideline
- Guideline:
- other: CIPAC Method 187, Particle size analysis by laser diffration
- GLP compliance:
- no
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- counted distribution
- Percentile:
- D50
- Mean:
- 39.6 µm
- Remarks on result:
- other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
- Percentile:
- D10
- Mean:
- 20.8 µm
- St. dev.:
- 5.96
- Percentile:
- D50
- Mean:
- 39.6 µm
- St. dev.:
- 7.16
- Percentile:
- D90
- Mean:
- 73.1 µm
- St. dev.:
- 8.89
- Conclusions:
- The third measure has been performed in dilute hydrochloric acid (pH = 2.0). The acid condition reduces the solubility of the item in the dispersing media and the third measure results therefore adequate.
As there is no significant difference between the determinations in pure water and dilute acid, all three have been considered for the final mean value.
The results are therefore considered to be adequate for the purposes of risk assessment.
Reference
Average of three determinations. Standard deviation is of the three determinations.
The third measure has been performed in dilute hydrochloric acid (pH = 2.0).
As there is no significant difference between the determinations in pure water and dilute acid, all three have been considered for the final mean value.
Description of key information
D50 = 39.6 µm, CIPAC Method 187, laser diffraction, Das, 2010
Additional information
The study has been conducted according to CIPAC Method 187 Guideline.
The acidified solution reduced the solubility of the item in the dispersing media. As there was no significant difference between the determinations in pure water and dilute acid, all three have been considered for the final mean value. The results are considered to be reliable with restrictions but adequate for the purposes of risk assessment.
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