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Administrative data

Endpoint:
nanomaterial dustiness
Type of information:
experimental study
Adequacy of study:
key study
Study period:
18.09.2020 - 14.10.2020
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

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: 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
GLP compliance:
no
Type of method:
continuous drop
Sampling:
The product was used without special pre-treatment, such as drying or similar.

Test material

Constituent 1
Reference substance name:
Reference substance 002
Cas Number:
99402-80-9
Test material form:
solid: nanoform, no surface treatment

Results and discussion

Dustiness indexopen allclose all
Key result
Mean:
50 391 other: 1/mg
St. dev.:
0 other: not relevant
Remarks on result:
other:
Remarks:
dustiness index as number of airborne particles per mg in the nanoscale (10 nm - 100 nm)
Mean:
13 301.3 other: N/cm3
St. dev.:
0 other: not relevant
Remarks on result:
other: number of airborne nanoparticles per cm3

Any other information on results incl. tables

Measurement duration: 10 min

temperature: 26°C, rel. air humidity 50 %

table 1: summary SMPS (sanning mobility particle sizer)

 Range

[nm]

 Mean

[nm]

 Concentration

[N/cm³]

ICD

[1/mg]

 

ECD

[1/mg·s]

 10-100 43,5 13301,3 50391,0 84,0
 100-417 233,1 20347,7 77085,7 128,5
 10-417 158,2 33649,0 127476,7 212,5

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

 5,4

394,0

1492,7

2,5

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: Continuous 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 13301.3 particles per cm3 in the nanoscale 10 - 100 nm. corresponding to a dustiness index of 50391.0 particles per mg in the nanoscale 10 - 100 nm. The mean size of the nanoparticles in the range 10 -100 nm was 43.5.

The OPS (0.3 - 10 µm) counted 394.0 particles per cm3 corresponding to a dustiness index of 1492.7 particles per mg. The mean size of the particles was 5.4 µm.