BS ISO 18747-2:2019
$142.49
Determination of particle density by sedimentation methods – Multi-velocity approach
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 30 |
This document specifies an in situ method for the determination of the density of solid particles or liquid droplets (herein referred to as “particle”) dispersed in liquid continuous phase. The method is based on direct experimental determination of particle velocity in these liquids or media in gravitational or centrifugal fields based on Stokes law. The particle density is calculated from experimentally determined particle velocities in different liquids or media, taking into account their dynamic viscosities and densities, respectively. The approach does not require the knowledge of particle size distribution but assumes that sedimentation relevant characteristics (e.g. volume, shape, agglomeration state) do not change. This document does not consider polydispersity with regard to particle density, i.e. all particles are assumed to be of the same material composition.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Symbols 5 Basic principle of the method |
| 12 | 6 Measuring techniques to determine sedimentation and creaming/flotation velocity of dispersed particles |
| 13 | 7 Preparation of samples 7.1 Continuous phase liquids |
| 14 | 7.2 Dispersing procedure 8 Measurements and data analysis |
| 15 | 9 Reference materials and measurement uncertainty 9.1 Reference materials |
| 16 | 9.2 Measurement uncertainty |
| 18 | Annex A (informative) Isopycnic density gradient (buoyant density) centrifugation |
| 19 | Annex B (informative) Examples of measurements and data analysis to determine particle density by multi-velocity approach |
| 23 | Annex C (informative) Uncertainty derivation of particle density based on uncertainty propagation rules |
| 26 | Bibliography |
