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Particle size distribution (Granulometry)

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Endpoint:
particle size distribution (granulometry)
Remarks:
dustiness
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Heubach-Dust-Meter connected to a cascade impactor
Qualifier:
according to guideline
Guideline:
DIN 55992-1 (Determination of a parameter for the dust formation of pigments and extenders - Part 1: Rotation method)
Version / remarks:
2006
Deviations:
yes
Remarks:
Heubach-Dust-Meter connected to a cascade impactor
Principles of method if other than guideline:
The Heubach dust meter is modified in a way that a seven stage cascade impactor is connected to the system. This involves an additional air fed of 20 L/min via the coarse dust separator needed to supply the cascade impactor with 40 L/min air current as specified in the manufacturer’s specifications.

The calculation report: EBRC (2017)

The Multiple-Path Particle Dosimetry Model (MPPD, v2.11; ARA, 2009) was used to predict this fractional deposition behaviour for workers.
The model algorithms calculate the deposition (and clearance) of mono-disperse and polydisperse aerosols in the respiratory tract for particles ranging from ultra-fine (0.01 microns) to coarse (20 microns) sizes. Within each airway, deposition is calculated using theoretically derived efficiencies for deposition by diffusion, sedimentation and impaction within the airway or airway bifurcation. Filtration of aerosols by the head is determined using empirical efficiency functions.
GLP compliance:
no
Type of method:
other: Heubach-Dust-Meter connected to a cascade impactor
Type of distribution:
volumetric distribution
Mass median aerodynamic diameter:
33.72 µm
Geometric standard deviation:
1.48
Remarks on result:
not measured/tested

Dustiness (airborne fraction): total: 443.43 mg/g.

In the original study report by DMT, a calculation of the mass median diameter was not conducted. Since the deposited fractions were provided for each of the cascade impactor stages, it was possible to fit a lognormal distribution to the data by non-linear regression procedure. As a result, the MMAD and GSD are calculable and reported (MMAD= 33.72 µm, GSD= 1.48).

As the cascade impactor already takes aerodynamic characteristics of the particles into account, the reported mass median diameter can be interpreted as the mass median aerodynamic diameter.

This figure and the corresponding GSD were used as distribution parameters for the MPPD model enabling an estimation of deposited dust fractions in the human respiratory tract: These fractions were estimated as follows:

Head (ET): 38.04 %

Tracheobronchial (TB): 0.02 %

Pulmonary (PU): < 0.01 %

Conclusions:
Total Dustiness (airborne fraction): 443.43 mg/g (experimental results, DMT Report).

Mass median aerodynamic diamater of airborne fraction: MMAD= 33.72 µm, GSD= 1.48

Fractional deposition in human respiratory tract (MPPD model, based on calculated MMAD):
Head (ET): 38.04 %
Tracheobronchial (TB): 0.02 %
Pulmonary (PU): < 0.01 %
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-01-04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Version / remarks:
1981
Deviations:
no
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
2009
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2013-03-22
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Remarks on result:
not measured/tested
Percentile:
D10
Mean:
127.9 µm
St. dev.:
4.1
Key result
Percentile:
D50
Mean:
326.5 µm
St. dev.:
9.4
Percentile:
D90
Mean:
680.8 µm
St. dev.:
25.7

Two test series of 3 measurements each were performed with the test item.

D10 D50 D90
Test series 1 130.8 µm 333.2 µm 699.0 µm
Test series 2 125.0 µm 319.9 µm 662.6 µm
Average 127.9 µm 326.5 µm 680.8 µm
Conclusions:
Potassium hexacyanocobaltate (III) has a median paticle size D50 = 327 µm, which was determined by laser diffraction measurement in accordance to ISO 13320 (2009).

Description of key information

Particle size distribution (Smeykal, 2017)

D50 = 326.5 µm

D10 = 127.9 µm

D90 = 680.8 µm

Dustiness (Gogilan, EBRC, 2017)

Total Dustiness: 443.43 mg/g

MMAD= 33.72 µm, GSD= 1.48

Fractional deposition in human respiratory tract:

Head (ET): 38.04 %

Tracheobronchial (TB): 0.02 %

Pulmonary (PU): < 0.01 %

Additional information