Ammonium wolframate

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Data from peer-reviewed handbook or collection of data.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.

GLP compliance:

no

Type of distribution:

counted distribution

Percentile:

D50

Remarks on result:

other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.

Percentile:

other: average crystal size of commercial products

Mean:

> 30 - < 100 µm

St. dev.:

0

The average crystal size of commercial products was noted as 30 -100 um. No standard deviation was provided.

Ammonium paratungstate grain size distribution was shown graphically to range from approximately 25 um to 130 um with a peak occurring at approximately 45 um.

Description of key information

The average crystal size of commercial ammonium paratungstate was noted to be 30 -100 um and ammonium paratungstate grain size distribution was shown graphically to range from approximately 25 um to 130 um with a peak occurring at approximately 45 um (Lassner and Schubert, 1999). Approximate Average Particle Size (Fisher Sub-Sieve Size): 21-50 um (Osram Sylvania, 2010).  Therefore, weight of evidence indicates that the average particle size of ammonium paratungstate is in the ranges of 30-50 um.