Sedimentation analysis

The sedimentation is an assay method for particle sizing of solid particles in the particle size range from about 100 microns to first For this purpose, the sample to be analyzed is suspended in a liquid (deionized water, cyclohexanol , ethylene glycol , isobutanol, etc.). Then the falling speed of the particles is measured, whereby three influencing factors are essential:

Particle diameter ,

Tenacity ( viscosity ) of the measuring liquid and

Density difference between particle and measuring liquid.

If one measures the fall path and fall time, then in the laminar area the size of the (imaginary spherical) particles in the examined sample can be calculated according to Stokes' law .

Photo sedimentation is used as an analytical method in the pharmaceutical industry .

Individual evidence

↑ Hans-Dieter Jakubke, Ruth Karcher (coordinators): Lexikon der Chemie in three volumes, Spektrum Verlag, Heidelberg, Volume 3, 1999, ISBN 3-8274-0381-2 , p. 226.
↑ Douglas A. Skoog, F. James Holler, Stanley R. Crouch: Instrumentelle Analytics. , 6th edition, Springer-Verlag , Berlin / Heidelberg, 2013, ISBN 978-3-642-38169-0 , pp. 931-934.

[„Lexikon3“-1] Hans-Dieter Jakubke, Ruth Karcher (coordinators): Lexikon der Chemie in three volumes, Spektrum Verlag, Heidelberg, Volume 3, 1999, ISBN 3-8274-0381-2 , p. 226.

[Skoog-2] Douglas A. Skoog, F. James Holler, Stanley R. Crouch: Instrumentelle Analytics. , 6th edition, Springer-Verlag , Berlin / Heidelberg, 2013, ISBN 978-3-642-38169-0 , pp. 931-934.