5,12-dihydro-2,9-dimethylquino[2,3-b]acridine-7,14-dione

Nanomaterial dustiness

Administrative data

Endpoint:

nanomaterial dustiness

Type of information:

experimental study

Adequacy of study:

key study

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:

1 meaurement performed

GLP compliance:

no

Type of method:

continuous drop

Sampling:

The test material was used without further treatment (e.g. drying). 72.3 g (238.38 cm3) test material are used for the measurement, dosing rate: 7.23 g/min

Test material

Test material information

Constituent 1

Reference substance name:

5,12-dihydro-2,9-dimethylquino[2,3-b]acridine-7,14-dione

EC Number:

213-561-3

EC Name:

5,12-dihydro-2,9-dimethylquino[2,3-b]acridine-7,14-dione

Cas Number:

980-26-7

Molecular formula:

C22H16N2O2

IUPAC Name:

2,9-dimethyl-5,7,12,14-tetrahydro-5,12-diazapentacene-7,14-dione

Test material form:

solid: nanoform

Results and discussion

Dustiness index

Dustiness index 1

Key result

Mean:

434 451.5 other: 1/mg

Remarks on result:

other: dustiness index as number of airborne particles per mg in the nanoscale (10 nm - 100 nm)

Dustiness index 2

Mean:

59 265.7 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: 28°C, rel. air humidity 51 %

The cleaned, almost particle-free air had a total particle count of 5 particles/cm³ in the range of 10 nm - 417 nm, the nanoscale fraction (10 - 100 nm) contained 3 particles/cm³.

table 1: summary SMPS (sanning mobility particle sizer)

Range [nm]	Mean [nm]	Concentration [N/cm^3]	ICD[1/mg]	ECD[1/mg x s]
10 - 100	55.3	59265.7	434451.5	724.1
100 - 417	206.2	108380.9	794493.7	1324.2
10 - 417	152.8	167646.7	1228945.2	2048.2

I_CD: dustiness index as number of airborne particles per mg

E_CD: 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/cm^3]	ICD[1/mg]	ECD[1/mg x s]
0.3 - 10	4.9	810.1	5938.2	9.9

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 167646.7 particles per cm³ (in the nanoscale (10 - 100 m) 59265.7 particles per cm³) corresponding to a dustiness index of 1228945.2 particles per mg (in the nanoscale (10 - 100 nm) 434451.5 particles per mg). The mean size of the nanoparticles was 55.3 nm, the mean size of particles in the range 10 - 417 nm was 152.8 nm.

The OPS (0.3 - 10 µm) counted 810.1 particles per cm³ corresponding to a dustiness index of 5938.2 particles per mg. The mean size of the particles was 4.9 µm.