Particle Analysis: Method Transfer from X-ray Sedimentation Analysis to PSA series (Laser Diffraction)
Some industries traditionally determine particle sizes via X-ray sedimentation, which involves long measurement times and considerable effort in terms of radiation protection. By optimizing calculation parameters, it is possible to transfer the results of the X-ray sedimentation analysis to the PSA series in a reproducible and repeatable way with a deviation of less than 5 %!
There are many methods for analyzing particle size. These differ not only in the measurable size range, but the definition of the particle size, or to be more precise, the respective equivalent diameter, is also different. Typically, the analyzed particles are always compared to the properties of a perfect sphere. For example, laser diffraction compares a particle with the projection surface of a sphere, dynamic light scattering compares it with the velocity of a corresponding sphere, and sedimentation compares it with the sinking behavior of a sphere. This inevitably leads to problems in method transfer, as the particle size distribution obtained (quantity of particles in a class) must be weighted differently depending on the type of quantity considered: Considering three particles with sizes of one, two, and three micrometers results in different size distributions depending on the type of weighting.
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