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Administrative data

Endpoint:
nanomaterial dustiness
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2020
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Remarks:
according to DIN EN 17199-3

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2020
Report date:
2020

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: DIN EN 17199-3
Version / remarks:
measurement of dustiness of bulk materials that contain or release respirable NOAA or other respirable particles - Part 3: Continuous drop method
Deviations:
yes
Remarks:
test conditions (temperature, humidity) due to laboratory environment; 1 meaurement performed
GLP compliance:
no
Type of method:
continuous drop
Sampling:
The test material was used without further treatment (e.g. drying). 74.2 g (309.2 cm3) test material are used for the measurement, dosing rate: 7.42 g/min

Test material

Constituent 1
Chemical structure
Reference substance name:
N,N'-naphthalene-1,5-diylbis[4-[(2,3-dichlorophenyl)azo]-3-hydroxynaphthalene-2-carboxamide]
EC Number:
271-178-7
EC Name:
N,N'-naphthalene-1,5-diylbis[4-[(2,3-dichlorophenyl)azo]-3-hydroxynaphthalene-2-carboxamide]
Cas Number:
68516-75-6
Molecular formula:
C44H26Cl4N6O4
IUPAC Name:
N,N'-naphthalene-1,5-diylbis{4-[(2,3-dichlorophenyl)diazenyl]-3-hydroxy-2-naphthamide}
Test material form:
solid: nanoform, no surface treatment

Results and discussion

Dustiness indexopen allclose all
Key result
Mean:
6 036.5 other: 1/mg
Remarks on result:
other: dustiness index as number of airborne particles per mg in the nanoscale (10 nm - 100 nm)
Mean:
8 451 other: N/cm3
Remarks on result:
other: number of airborne nanoparticles per cm3

Any other information on results incl. tables

measurement duration: 10 min

temperature: 20°C, rel. air humidity 44 %

The cleaned, almost particle-free air had a total particle count of 13 particles/cm3 in the range of 10 nm - 417 nm, the nanoscale fraction (10 - 100 nm) contained 8 particles/cm3.

table 1: summary SMPS (sanning mobility particle sizer)

Range [nm]

Mean [nm]

Concentration [N/cm3]

ICD[1/mg]

ECD[1/mg x s]

10 - 100

52.9

8451.0

6036.5

10.1

100 - 417

160.5

6863.8

4902.7

8.2

10 - 417

101.1

15314.9

10939.2

18.2

ICD: dustiness index as number of airborne particles per mg

ECD: emission rate as number of particles per mg per second

mean: average particle diameter in nm

N: number of airborne particles

table 2: summary OPS (optical particle sizer)

Range [µm]

Mean [µm]

Concentration [N/cm3]

ICD[1/mg]

ECD[1/mg x s]

0.3 - 10

4.7

38.7

27.6

0.05

Applicant's summary and conclusion

Executive summary:

The dusting behaviour of the test material was investigated using DIN EN 17199 -3: 2019 -12 "workplace exposure - measurement of dustiness of bulk materials that contain or release respirable nano objects and their aggregates and agglomerates or other respirable particles- Part 3: Copntinuous drop method".

The dust released by the falling test material was measured by a scanning mobility particle sizer (SMPS, 10 - 417 nm) and an optical particle sizer (3 - 10 µm). The counterflow was provided by cleaned, almost particle-free air.

The SMPS counted 8451.0 particles per cm3 (in the nanoscale (10 - 100 m)

corresponding to a dustiness index of 6036.5 particles per mg (in the nanoscale (10 - 100 nm).

The mean size of the nanoparticles was 46.3 nm (in the nanoscale 10 - 100 nm).

The SMPS counted 15314.9 particles per cm3(in the nanoscale (10 - 417 m)

corresponding to a dustiness index of 10939.2 particles per mg (in the nanoscale (10 - 417 nm).

The mean size of the nanoparticles was 101.1 nm (in the nanoscale 10 - 417 nm).

The OPS (0.3 - 10 µm) counted 38.7 particles per cm3 corresponding to a dustiness index of 27.6 particles per mg. The mean size of the particles was 4.7 µm.

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