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Sedimentation in Particle Size Analysis

Particle Size Analysis

  1. Claus Bernhardt

Published Online: 15 SEP 2006

DOI: 10.1002/9780470027318.a1513

Encyclopedia of Analytical Chemistry

Encyclopedia of Analytical Chemistry

How to Cite

Bernhardt, C. 2006. Sedimentation in Particle Size Analysis. Encyclopedia of Analytical Chemistry. .

Author Information

  1. Technische Universität Bergakademie Freiberg, Germany

Publication History

  1. Published Online: 15 SEP 2006


Particle size analysis by sedimentation is one of the most important techniques of analysis. The principle is based on the fact that it is possible to draw conclusions about the geometrical dimensions (size) of the particles from the speed of their movement in a fluid. In the past many different apparatuses were developed. Nowadays, methods that allow quick, automatic measurement are most popular.

This article consists of two general sections valid for all methods: the first concerns the undisturbed and disturbed movement of particles in a fluid at rest, and the second concerns the dispersion of solids in liquids.

The methods described are divided in gravitational methods and methods used in a centrifugal field, respectively. Finally, the appendix gives a list of liquids and dispersing agents valid for measurement.