ISO 22412:2017
Particle size analysis — Dynamic light scattering (DLS)
ISO 22412:2017 specifies the application of dynamic light scattering (DLS) to the measurement of average hydrodynamic particle size and the measurement of the size distribution of mainly submicrometre-sized particles, emulsions or fine bubbles dispersed in liquids. DLS is also referred to as "quasi-elastic light scattering (QELS)" and "photon correlation spectroscopy (PCS)," although PCS actually is one of the measurement techniques.
ISO 22412:2017 is applicable to the measurement of a broad range of dilute and concentrated suspensions. The principle of dynamic light scattering for a concentrated suspension is the same as for a dilute suspension. However, specific requirements for the instrument setup and specification of test sample preparation are required for concentrated suspensions. At high concentrations, particle-particle interactions and multiple light scattering can become dominant and can result in apparent particle sizes that differ between concentrated and dilute suspensions.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Principle
6 Apparatus
7 Test sample preparation
7.1 General
7.2 Concentration limits
7.3 Checks for concentration suitability
8 Measurement procedure
9 Evaluation of results
9.1 General
9.2 Correlation analysis
9.2.1 Cumulants method
9.2.2 Distribution calculation algorithms
9.3 Frequency analysis
10 System qualification and quality control
10.1 System qualification
10.2 Quality control of measurement results
10.3 Method precision and measurement uncertainty
11 Test report
Annex A (informative) Theoretical background
Annex B (informative) Guidance on potential measurement artefacts and on ways to minimize their influence
Annex C (informative) Online measurements
Annex D (informative) Recommendations for sample preparation
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Principle
6 Apparatus
7 Test sample preparation
7.1 General
7.2 Concentration limits
7.3 Checks for concentration suitability
8 Measurement procedure
9 Evaluation of results
9.1 General
9.2 Correlation analysis
9.2.1 Cumulants method
9.2.2 Distribution calculation algorithms
9.3 Frequency analysis
10 System qualification and quality control
10.1 System qualification
10.2 Quality control of measurement results
10.3 Method precision and measurement uncertainty
11 Test report
Annex A (informative) Theoretical background
Annex B (informative) Guidance on potential measurement artefacts and on ways to minimize their influence
Annex C (informative) Online measurements
Annex D (informative) Recommendations for sample preparation
Bibliography