Aluminum magnesium vanadium oxide

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

09 Sep 2011 - 14 Sep 2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP - Guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)

Deviations:

no

Qualifier:

according to guideline

Guideline:

other: ISO 13317-2 Fixed Pipette Method

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Kaiser-Friedrich-Straße 7, 55116 Mainz, Rheinland-Pfalz, Germany

Type of method:

sedimentation (gravitational settling)

Type of distribution:

volumetric distribution

Percentile:

D10

Mean:

18 µm

Remarks on result:

other: No source field for Standard deviation.

Percentile:

D50

Mean:

40 µm

Remarks on result:

other: No source field for Standard deviation.

Percentile:

D90

Mean:

98 µm

Remarks on result:

other: No source field for Standard deviation.

No.:

#1

Size:

201.14 µm

Distribution:

97.34 %

No.:

#2

Size:

140.32 µm

Distribution:

93.32 %

No.:

#3

Size:

97.85 µm

Distribution:

89.97 %

No.:

#4

Size:

68.21 µm

Distribution:

87.29 %

No.:

#5

Size:

47.53 µm

Distribution:

70.87 %

No.:

#6

Size:

33.1 µm

Distribution:

40.71 %

No.:

#7

Size:

23.04 µm

Distribution:

19.94 %

No.:

#8

Size:

16.03 µm

Distribution:

7.04 %

No.:

#9

Size:

11.24 µm

Distribution:

1.34 %

Result and discussion

The determination was performed in triplicate.

 

In the following table, the values of three experiments and the respective mean as well as the difference were determined according to the measurable part (98.4 – 99.6% of total test item). For comparison, the correlated values for the total test item are also given:

 

Stokes-diameter in μm	Mass under particle size Exp.1 (%)	Mass under particle size Exp.2 (%)	Mass under particle size Exp.3 (%)	Mass under particle size Mean (%)	Difference (%)	Mass under particle size Mean, calculated according to the total test item. ( %)
201.4	99.49	98.47	96.46	98.14	3.03	97.34
140.32	95.96	93.37	92.93	94.09	3.03	93.32
97.85	94.44	90.31	87.37	90.71	7.07	89.97
68.21	90.91	86.73	86.36	88.00	4.55	87.29
47.53	68.69	75.00	70.71	71.46	6.31	70.87
33.10	39.39	44.90	38.89	41.06	6.01	40.71
23.04	17.17	23.47	19.70	20.11	6.30	19.94
16.03	7.07	8.67	5.56	7.10	3.12	7.04
11.24	2.53	0.51	1.01	1.35	2.02	1.34

meas. part = measurable oart = 98.4 - 99.6 of total test item

For the total test item, the following values apply (approximate values, as only discrete sizes can be measured):

D10: 18 µm

D50: 40 µm

D90: 98 µm

All experimental values show good correlation. The difference between the measurement values of the main studies all far below the required threshold of 20%.

 

In all experiments, sedimentation took place before the first sampling time. In the three experiments, approx. 0.5 – 2% resp. of the particles were not retrieved when determining the 100% value. These particles must be considered as larger than 201.146 μm.

 

The particle size distribution shows no homogeneous distribution; fractions between 20 and 70 µm are much larger than the other fractions. Almost 100% of the particles are smaller than 201 μm, and less than 10% are smaller than 16 μm.

Description of key information

D10: 18 µm
D50: 40 µm
D90: 98 µm

Additional information

The particle size distribution was determined by sedimentation following OECD Guideline 110 (ISO13317-2 Fixed Pipette Method).

The particle size distribution shows no homogeneous distribution. The substance contains approximately 100% of particles with a particle size < 201 μm, and approximately 10% of particles < 16 μm.