Dialuminium zinc tetraoxide

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 oct 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)

Qualifier:

according to guideline

Guideline:

other: ISO 13317-2 Fixed Pipette Method

Principles of method if other than guideline:

The particle size distribution was determined by sedimentation following ISO13317-2 Fixied Pipette Method.

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:

22 µm

Remarks on result:

other: no st. dev. reported

Percentile:

D50

Mean:

37 µm

Remarks on result:

other: no st. dev. reported

Percentile:

D90

Mean:

140 µm

Remarks on result:

other: approximate values, as only discrete values can be measured

No.:

#1

Size:

200.14 µm

Distribution:

96.22 %

No.:

#2

Size:

139.21 µm

Distribution:

92.24 %

No.:

#3

Size:

96.77 µm

Distribution:

86.1 %

No.:

#4

Size:

67.23 µm

Distribution:

84.11 %

No.:

#5

Size:

46.68 µm

Distribution:

64.37 %

No.:

#6

Size:

32.38 µm

Distribution:

35.17 %

No.:

#7

Size:

22.45 µm

Distribution:

9.79 %

No.:

#8

Size:

15.55 µm

Distribution:

3.15 %

No.:

#9

Size:

10.76 µm

Distribution:

0.17 %

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 (97.6 – 98.7% 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. ( %)
200.14	98.48	97.45	98.48	98.14	1.04	96.22
136.21	94.44	91.84	95.94	94.07	4.10	92.24
96.77	85.86	88.78	88.83	87.82	2.97	86.10
67.23	84.34	86.22	86.80	85.79	2.46	84.11
46.68	72.22	57.65	67.01	65.63	14.57	64.37
32.38	37.37	35.20	35.03	35.87	2.35	35.17
22.45	7.07	10.71	12.18	9.99	5.11	9.79
15.55	4.55	1.02	4.06	3.21	3.53	3.15
10.76	0.00	0.00	0.51	0.17	0.51	0.17

 

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. 1 – 2% of the particles were not retrieved when determining the 100% value. These particles must be considered as larger than 200.14 μm.

 

The particle size distribution shows no homogeneous distribution, leaving fractions of approx. 2% above 200 µm and less than 1% below 10 µm. It can be seen that almost all particles of the test item D-Prism are smaller than 200 µm.

 

Description of key information

D10: 22 µm
D50: 37 µm
D90: 140 µm

Additional information

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