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EC number: -
CAS number: -
During the method development phase of the analysis trials were
conducted using the small volume (wet) module (SVM) only. The SVM trials
were conducted using water as the dispersant. The results of these
trials indicated that the most appropriate test and material parameters
to obtain the optimum measurements were:
Dispersion speed: 1700 rpm
Refractive index (sample): 0.000 n
Absorption: 0.000 AU
Analysis model: General purpose (normal)
Using the identified parameters, the particle size was analysed over the
range 0.01 µm to 3500 µm. The results of the formal analysis are
presented in Table 1. In addition, a graph of volume (%) versus Particle
Diameter (µm) and full particle size distribution, is attached.
Table 1: Full Test Results
% STD VP
All particle size results are in µm
82.84% by volume of sample was seen to be < 10.00 µm
: volume weighted mean
10% of the test item is less than this particle size
50% of the test item is less than this particle size
90% of the test item is less than this particle size
geometric standard deviation of the lognormal particle size
mass median aerodynamic diameter
calculated from the entirety of the data captured in each run and
not a simple arithmetic mean
standard deviation of the population
percentage standard deviation of the population
coefficient of variation for d50 is less than 3 %; d10 and d90 are
less than 5 %. Thus repeatability of the characteristic particles
in the size distribution is within the acceptable limits as per
the ISO 13320-1 test standard
The results of the laser diffraction test conducted to determine the
particle size of the test substance are summarised in the table below.
The analysis was conducted using the small volume (wet) module (SVM)
with water as the dispersant.
Particle size analysis using small volume (wet) module (SVM)
Volume weighted mean
d10 (10% of material is <)
d50 (50% of material is <) median
d90 (90% of material is <)
MMAD (mass median aerodynamic diameter)
Volume of sample < 10.00 µm
The results do not show any particles < 100 nm (0.1 µm).
82.84% particles < 10 µm in diameter, d50: 6.15 µm; CIPAC MT 87;
Livingston, I (2018)
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