SIST EN 12948:2011

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Calcium-/Magnesium-Bodenverbesserungsmittel - Bestimmung der Korngrößenverteilung durch Trocken- und NasssiebungAmendements minéraux basiques - Détermination de la distribution granulométrique par tamisage par voie sèche ou par voie humideLiming materials - Determination of size distribution by dry and wet sieving65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 12948:2010SIST EN 12948:2011en,fr,de01-oktober-2011SIST EN 12948:2011SLOVENSKI
STANDARDSIST EN 12948:20031DGRPHãþD



SIST EN 12948:2011



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12948
November 2010 ICS 65.080 Supersedes EN 12948:2002English Version
Liming materials - Determination of size distribution by dry and wet sieving
Amendements minéraux basiques - Détermination de la distribution granulométrique par tamisage par voie sèche ou par voie humide
Calcium-/Magnesium-Bodenverbesserungsmittel - Bestimmung der Korngrößenverteilung durch Trocken-und Nasssiebung This European Standard was approved by CEN on 2 October 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12948:2010: ESIST EN 12948:2011



EN 12948:2010 (E) 2 Contents Page Foreword .3Introduction .41Scope .52Normative references .53Principle .54Apparatus .55Sampling and sample preparation .66Procedure .67Expression of results .88Precision .99Test report .9Annex A
(informative)
Results of an inter-laboratory trial to determine the size distribution by dry and wet sieving. 10Bibliography . 11 SIST EN 12948:2011



EN 12948:2010 (E) 3 Foreword This document (EN 12948:2010) has been prepared by Technical Committee CEN/TC 260 “Fertilizers and liming materials”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2011, and conflicting national standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12948:2002. The following has been added to the former edition of the European Standard: a) the sampling method is not part of the standard. Informative reference to EN 1482-1 added; b) normative reference to EN 1482-2 concerning sample preparation added; c) clarification of the method of dispersion of agglomerates in method B added; d) Bibliography revised. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 12948:2011



EN 12948:2010 (E) 4 Introduction The dry sieving of powdered material containing individual particles can be carried out quite easily. This method is simple, quick, cheap and enables the determination of the particle size of water-soluble materials. Therefore the dry sieving method should always be used first. However, the sieve apertures can become blocked by sample particles, a phenomenon known as blinding. Blinding is mainly caused by caking and the production of electrostatic charges, particularly on sieves with small apertures. Dry sieving of very wet material can also lead to blinding. These difficulties are not encountered with the wet sieving method, which is applicable to any kind of material such as powders (dry or wet), paste-like products or granules except those containing water-soluble constituents. In order to ensure the comparability of results, all masses of size fractions are expressed as dry matter. The approach to methods and principles of sieving refers to existing guidelines and European Regulations ([1] and [2]). SIST EN 12948:2011



EN 12948:2010 (E) 5 1 Scope This European Standard specifies two methods for the determination of the particle size distribution of liming materials. The dry sieving method (method A) is applicable to all liming materials except wet and paste-like products. Method A is not applicable, if blinding, caking, electrostatic charges or agglomeration occur after pre drying. The wet sieving method (method B) is applicable to products which are susceptible to blinding, caking, electrostatic charges or agglomeration after pre drying.
Method B can be used to determine the primary particle size distribution of granulated products. Method B is not applicable to burnt lime and liming materials containing water-soluble constituents. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1235:1995, Solid fertilizers — Test sieving (ISO 8397:1988 modified) EN 1482-2, Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample preparation EN 12048, Solid fertilizers and liming materials — Determination of moisture
content — Gravimetric method by drying at (105 ± 2) °C (ISO 8190:1992 modified) ISO 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth 3 Principle 3.1 Method A Dry sieving of a liming material with one or more test sieves by hand or using a mechanical sieving machine. 3.2 Method B Wet sieving of a liming material, if necessary after dispersion under continuous water spraying, by hand or using a mechanical sieving machine. Drying of the different fractions retained on the sieves. 4 Apparatus Usual laboratory apparatus and in particular 4.1 to 4.6. 4.1 Balance, capable of weighing to the nearest 0,01 g. SIST EN 12948:2011



EN 12948:2010 (E) 6 4.2 Mechanical shaker (sieving machine), capable of imparting both horizontal and vertical motion to material inside a nest of sieves, fitted with a lid with a water intake and a receiver with a water outlet when used for method B. NOTE Hand sieving can be carried out instead of mechanical sieving. 4.3 Stainless steel woven wire test sieves, conforming to ISO 3310-1 and of appropriate nominal aperture sizes. 4.4 Stopwatch. 4.5 Soft brush. 4.6 Oven, capable of being controlled at (105 ± 2) °C. 5 Sampling and sample preparation Sampling is not pa
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