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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-01-12
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
The particle size was determined by use of a Beckman Coulter LS particle size analyzer. Due to the high solubility of sodium azide in water, 2-propanol was used as suspending liquid.
The use of a particle counter is mentioned in the guidelines OECD 110 and EPA OPPTS 830.7520 with further reference to guideline ANSI-C 690-75, but no use of either guideline was mentioned in the text.
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Type of distribution:
counted distribution
Percentile:
D10
Mean:
108 µm
Remarks on result:
other: No standard deviation detailed in the report.
Percentile:
D50
Mean:
247.1 µm
Remarks on result:
other: No standard deviation detailed in the report.
Percentile:
D90
Mean:
489.8 µm
Remarks on result:
other: No standard deviation detailed in the report.
Percentile:
other: Overall mean
Mean:
285.1 µm
Remarks on result:
other: Standard deviation is 186.9 µm.

- Mean value obtained from three measurements.

- Standard deviation is 186.9 µm.

Conclusions:
The particle size of Sodium azide was determined using a Beckman Coulter LS. The mean diameter is 285.1 µm, the median (d50) is 247.1 µm and the standard deviation is 186.9 µm. The other percentiles of the particle size distribution are 108.0 µm (d10) and 489.8 µm (d90).
Executive summary:

The particle size (granulometry) of Sodium azide was determined using a Beckman Coulter LS Particle Size Analyser. Due to the high water Solubility of sodium azide, the measurement was conducted as suspension of Sodium azide in 2-propanol. The mean value from three different measurements was 285.1 µm with a standard deviation of 186.9 µm. The percentiles were 108.0 µm (d10), 247.1 µm (d50), and 489.8 µm (d90).

Description of key information

The particle size (granulometry) of Sodium azide was determined using a Beckman Coulter LS Particle Size Analyser. Due to the high water solubility of Sodium azide, the measurement was conducted as suspension of Sodium azide in 2-propanol. The mean value from three different measurements was 285.1 µm with a standard deviation of 186.9 µm. The percentiles were 108.0 µm (d10), 247.1 µm (d50), and 489.8 µm (d90).

Additional information