Malvern Mastersizer Series Getting Started page 163

A P P E N D I X D
P a g e D . 2
G e t t i n g S t a r t e d
As an example consider the measurements shown below.
A sample of material was suspended in water at a volume concentration of 0.032
%.
The differential refractive index is low and the size around 1µm so that
presentation is important.
The analysis was performed with presentations GAD, GDD, GFD and GHD.
A plot of the log of reported volume concentration against absorption gives:-
1
0.1
0.01
GAD
0.001
0
The horizontal line at 0.032% À indicates that the closest approximation to the
presentation is GFD with absorption 0.01.
Presentation Absorption
GAD 0
GDD 0.001
GFD 0.01
GHD 0.1
The table shows that, in this case, the volume concentration match is a much
more sensitive indicator of the absorption than the residual.
GDD
0.001
0.01
Particle Imaginary Refractive Index
Volume
Concentration
0.421%
0.157%
0.025%
0.004%
1
GFD
GHD
0.1
Residual
0.099%
0.119%
0.049%
0.531%
M A N 0 1 0 1