ISO-13320-1-1999.pdf
《ISO-13320-1-1999.pdf》由会员分享,可在线阅读,更多相关《ISO-13320-1-1999.pdf(42页珍藏版)》请在三一文库上搜索。
1、A Reference number ISO 13320-1:1999(E) INTERNATIONAL STANDARD ISO 13320-1 First edition 1999-11-01 Particle size analysis Laser diffraction methods Part 1: General principles Analyse granulomtrique Mthodes par diffraction laser Partie 1: Principes gnraux Copyright International Organization for Stan
2、dardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 05:04:19 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 13320-1:1999(E) ISO 1999 All rights reserved. Unless otherwise specified, no part of this publication may
3、 be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerla
4、nd ii Contents 1 Scope1 2 Normative reference1 3 Terms, definitions and symbols.1 3.1 Terms and definitions 1 3.2 Symbols.3 4 Principle4 5 Laser diffraction instrument.4 6 Operational procedures 6 6.1 Requirements6 6.2 Sample inspection, preparation, dispersion and concentration7 6.3 Measurement.9 6
5、.4 Repeatability11 6.5 Accuracy11 6.6 Error sources; diagnosis .12 6.7 Resolution; sensitivity .14 7 Reporting of results.14 Annex A (informative) Theoretical background of laser diffraction.16 Annex B (informative) Recommendations for instrument specifications .25 Annex C (informative) Dispersion l
6、iquids for the laser diffraction method.28 Annex D (informative) Refractive index for various liquids and solids .29 Bibliography34 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 05:04:19 MDTNo
7、reproduction or networking permitted without license from IHS -,-,- ISOISO 13320-1:1999(E) iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carri
8、ed out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. I
9、SO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical commit
10、tees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 13320-1 was prepared by Technical Committee ISO/TC 24, Sieves, sieving and other sizing methods, Subcommitt
11、ee SC 4, Sizing by methods other than sieving. ISO 13320 consists of the following parts, under the general title Particle size analysis Laser diffraction methods: Part 1: General principles Part 2: Validation of inversion procedures Annexes A to E of this part of ISO 13320 are for information only.
12、 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 05:04:19 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 13320-1:1999(E) ISO iv Introduction Laser diffraction metho
13、ds are nowadays widely used for particle sizing in many different applications. The success of the technique is based on the fact that it can be applied to various kinds of particulate systems, is fast and can be automated and that a variety of commercial instruments is available. Nevertheless, the
14、proper use of the instrument and the interpretation of the results require the necessary caution. Therefore, there is a need for establishing an International Standard for particle size analysis by laser diffraction methods. Its purpose is to provide a methodology for adequate quality control in par
15、ticle size analysis. Historically, the laser diffraction technique started by taking only scattering at small angles into consideration and, thus, has been known by the following names: Fraunhofer diffraction; (near-) forward light scattering; low-angle laser light scattering (LALLS). However, the t
16、echnique has been broadened to include light scattering in a wider angular range and application of the Mie theory in addition to approximating theories such as Fraunhofer and anomalous diffraction. The laser diffraction technique is based on the phenomenon that particles scatter light in all direct
17、ions with an intensity pattern that is dependent on particle size. All present instruments assume a spherical shape for the particles. Figure 1 illustrates the characteristics of single particle scattering patterns: alternation of high and low intensities, with patterns that extend for smaller parti
18、cles to wider angles than for larger particles 2-7, 10, 15 in the bibliography. Within certain limits the scattering pattern of an ensemble of particles is identical to the sum of the individual scattering patterns of all particles present. By using an optical model to compute scattering patterns fo
19、r unit volumes of particles in selected size classes and a mathematical deconvolution procedure, a volumetric particle size distribution is calculated, the scattering pattern of which fits best with the measured pattern (see also annex A). a)b) Figure 1 Scattering pattern for two spherical particles
20、: the particle generating pattern a) is twice as large as the one generating pattern b) A typical laser diffraction instrument consists of a light beam (usually a laser), a particulate dispersing device, a detector for measuring the scattering pattern and a computer for both control of the instrumen
21、t and calculation of the particle size distribution. Note that the laser diffraction technique cannot distinguish between scattering by single particles and scattering by clusters of primary particles forming an agglomerate or an aggregate. Usually, the resulting particle size for agglomerates is re
22、lated to the cluster size, but sometimes the size of the primary particles is reflected in the particle size distribution as well. As most particulate samples contain agglomerates or aggregates Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=A
23、ramco HQ/9980755100 Not for Resale, 04/11/2007 05:04:19 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 13320-1:1999(E) v and one is generally interested in the size distribution of the primary particles, the clusters are usually dispersed into primary particles befo
24、re measurement. Historically, instruments only used scattering angles smaller than 14, which limited the application to a lower size of about 1 mm. The reason for this limitation is that smaller particles show most of their distinctive scattering at larger angles (see also annex A). Many recent inst
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ISO 13320 1999
链接地址:https://www.31doc.com/p-3774496.html