1、BRITISH STANDARD BS EN 12902:2004 Products used for treatment of water intended for human consumption Inorganic supporting and filtering materials Methods of test The European Standard EN 12902:2004 has the status of a British Standard ICS 71.100.80 BS EN 12902:2004 This British Standard was publish
2、ed under the authority of the Standards Policy and Strategy Committee on 2 December 2004 BSI 2 December 2004 ISBN 0 580 44953 X National foreword This British Standard is the official English language version of EN 12902:2004. It supersedes BS EN 12902:1999, which is withdrawn. The UK participation
3、in its preparation was entrusted to Technical Committee CII/59, Chemicals for drinking water treatment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement internati
4、onal or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport
5、to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee an
6、y enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 36, an i
7、nside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12902 November 2004 ICS 71.100.80 Supersedes EN 12902:19
8、99 English version Products used for treatment of water intended for human consumption - Inorganic supporting and filtering materials - Methods of test Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Matriaux inorganiques de filtration et de support - Mthodes
9、dessaiProdukte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Anorganische Filterhilfs- und Filtermaterialien - Prfverfahren This European Standard was approved by CEN on 30 September 2004. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the cond
10、itions 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 Central Secretariat or to any CEN member. This European Standard exists in three
11、 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Aust
12、ria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDI
13、ZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12902:2004: EEN 12902:2004 (E) 2 Contents Page Forewor
14、d3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Sampling.4 5 Physical properties5 6 Chemical properties 16 Annex A (informative) Measurement of resistance to friability 33 EN 12902:2004 (E) 3 Foreword This document (EN 12902:2004) has been prepared by Technical Committee CEN/TC 16
15、4 “Water supply”, the secretariat of which is held by AFNOR. 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 2005, and conflicting national standards shall be withdrawn at the latest by May 20
16、05. This document supersedes EN 12902:1999. Significant technical differences between this edition and EN 12902:1999 are as follows: a) Addition in 5.2.6 of a requirement to round results to the nearest 10 kg/m 3 . b) Modification of Table 4 to specify analytical performance characteristics instead
17、of specific methods. c) Modification of 6.5 to allow the use of a larger test sample. d) Deletion of clause 7 (Determination of polynuclear aromatic hydrocarbons (PAH) in aqueous extracts). e) Correction of figure A.2. According to the CEN/CENELEC Internal Regulations, the national standards organiz
18、ations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slov
19、enia, Spain, Sweden, Switzerland and United Kingdom. EN 12902:2004 (E) 4 1 Scope This document specifies methods of test to determine physical and chemical properties of Inorganic Supporting and Filtering Materials (ISFM). NOTE The applicability of the methods is specified in the relevant product st
20、andard. 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 12901:1999, Pro
21、ducts used for treatment of water intended for human consumption Inorganic supporting and filtering materials Definitions. EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987). ISO 562, Hard coal and coke Determination of volatile matter. ISO 565, Test siev
22、es Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO 609, Solid mineral fuels Determination of carbon and hydrogen High temperature combustion method. ISO 2395, Test sieves and test sieving Vocabulary. ISO 2591-1, Test sieving Part 1: Methods using test
23、sieves of woven wire cloth and perforated metal plate. ISO 3165, Sampling of chemical products for industrial use Safety in sampling. ISO 6206, Chemical products for industrial use Sampling Vocabulary. ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the
24、form of particles varying from powders to coarse lumps. ISO 9276-1, Representation of results of particle size analysis Part 1: Graphical representation. ISO 13320-1, Particle size analysis Laser diffraction methods Part 1: General principles. 3 Terms and definitions For the purpose of this document
25、, the terms and definitions given in EN 12901:1999 apply. 4 Sampling Observe the recommendations of ISO 3165 and see ISO 6206. Sample in accordance with ISO 8213 and obtain the laboratory sample from the bulk sample by using a divider. EN 12902:2004 (E) 5 5 Physical properties 5.1 Particle size dist
26、ribution 5.1.1 General The particle size distribution of granular materials shall be determined by sieving; this is applicable to distributions measured using sieves of nominal aperture size of 0,025 mm and above (see ISO 2591-1). For powders, the particle size shall be determined according to the l
27、aser optical method (see 5.1.4). NOTE Alternative methods for particle size determination include: water sieving for powders; size measurement with magnification: microscopic counting; particle fall in a fluid without acceleration: settling; particle fall in a fluid with acceleration: cycloning; ele
28、ctromagnetic wave diffraction: turbidity; dielectric properties: Coulter counter. 5.1.2 Principle Measurement of particle size distribution by sieving for granular materials or laser diffraction for powders. 5.1.3 Particle size distribution for granular material The particle size distribution for gr
29、anular material shall be determined in accordance with ISO 2591-1; see also ISO 2395 and ISO 565. 5.1.4 Particle size distribution for powders 5.1.4.1 General The laser diffraction method described applies to powders in suspension in a liquid or gaseous fluid as well as to aerosols or emulsions. Mea
30、surable particle sizes are between 0,5 m and an upper limit linked to the optical configuration of the laser equipment used which can range up to 3 600 m. The principle of the method and guidance on measurement are given in ISO 13320-1. 5.1.4.2 Reagents All reagents shall be of a recognized analytic
31、al grade and the water used shall conform to grade 3 in accordance with EN ISO 3696. EN 12902:2004 (E) 6 5.1.4.3 Apparatus Ordinary laboratory apparatus together with the following. 5.1.4.3.1 Laser diffraction instrument (see ISO 13320-1). 5.1.4.4 Measurement Disperse the sample in a suitable fluid
32、(e.g. water, see ISO 13320-1) and introduce it into the analyzer in accordance with the manufacturers recommendations. Adjust the measurement conditions by carrying out repetitive analyses to optimize reproducibility. Measure the scattering pattern and convert the results to particle size distributi
33、on following the recommendations in ISO 13320-1. 5.1.5 Expression of results The results shall be presented as a cumulative particle size distribution curve in accordance with ISO 9276-1. 5.1.6 Processing of results From the cumulative particle size distribution curve, determine the value of the fol
34、lowing parameters: effective size d 10 ; uniformity coefficient U; minimum size d 1 ; oversize percentage; undersize percentage. 5.2 Bulk density (loose and packed) 5.2.1 General This method of measurement is not routinely used for materials with particle size greater than 4 mm. 5.2.2 Principle The
35、volume of dried ISFM, loose or packed, is determined in a measuring cylinder; dividing the mass of dried ISFM by its volume gives the bulk density. 5.2.3 Apparatus Ordinary laboratory apparatus and glassware together with the following. 5.2.3.1 Balance with a capacity of 500 g or 2 000 g depending o
36、n volume of sample (see Table 1), with an accuracy of 1 g. 5.2.3.2 Desiccator. 5.2.3.3 Oven capable of being controlled at (105 2) C. 5.2.3.4 Graduated measuring cylinder of (250 2) ml or (1 000 10) ml according to Table 1. EN 12902:2004 (E) 7 5.2.4 Preparation of the sample Dry a sufficient quantit
37、y of ISFM at (105 2) C to constant mass. Return to ambient temperature in the desiccator. NOTE Porous material should be dried at (150 2) C. The volume of sample is determined according to the particle size of ISFM (Table 1). Table 1 Minimum ISFM sample volume according to particle size ISFM Maximum
38、 particle size mm Measuring cylinder volume ml Minimum sample volume ml Powder 0,4 250 2 100 Granular material 0,4 to 4 1 000 10 500 5.2.5 Procedure 5.2.5.1 Loose material Weigh the empty measuring cylinder and note its mass m 0to the nearest 1 g. With the measuring cylinder (5.2.3.4) positioned ver
39、tically, pour the sample of ISFM into the measuring cylinder. Measure the volume of the loose material V 1to the nearest 10 ml. Weigh the measuring cylinder full and note its mass m 1to the nearest 1 g. 5.2.5.2 Packed material Weigh the empty measuring cylinder (5.2.3.4) and note its mass m 0to the
40、nearest 1 g. With the measuring cylinder positioned vertically, pour the minimum volume of ISFM according to Table 1 into the measuring cylinder. Tap the walls of the measuring cylinder with a glass rod covered with a rubber sleeve until the volume of ISFM remains constant. Measure the volume V 1 .
41、Weigh the measuring cylinder full and note its mass m 1to the nearest 1 g. 5.2.6 Expression of result The bulk density () of the material expressed in kilograms per cubic metre is calculated from the following equation: 1000 1 0 1 = V m m (1) where m 0is the mass of the measuring cylinder, in grams;
42、 m 1is the mass of the sample of ISFM and the measuring cylinder, in grams; V 1is the volume of the ISFM in the measuring cylinder, in millilitres. Express the result to the nearest 10 kg/m 3 . EN 12902:2004 (E) 8 5.3 Permeability of powders 5.3.1 General The method is applicable to ISFM with median
43、 diameter (d 50 ) between 5 m and 200 m. 5.3.2 Principle Measurement of the time needed for a fixed volume of water to flow across a cake of ISFM of precise dimensions under specified conditions of temperature and pressure. 5.3.3 Reagent The fluid used for the test shall be water conforming to grade
44、 3 in accordance with EN ISO 3696. 5.3.4 Apparatus Ordinary laboratory apparatus and glassware together with the following 5.3.4.1 Permeameter Figure 1 gives an example of a permeameter. EN 12902:2004 (E) 9 Key 1 funnel 7 pneumatic jack 2 test fluid 8 electric shut down 3 compressed air 9 thermomete
45、r 4 valve 10-13 electrodes 5 measurement chamber 14 drain valve 6 cylindrical cake carrier Figure 1 Example of permeameter EN 12902:2004 (E) 10 5.3.4.2 Beaker 600 ml. 5.3.4.3 Flat ruler. 5.3.4.4 Fluid reservoir. 5.3.4.5 Reducing valve with a manometer 0 kPa to 220 kPa, readable to 2 kPa. 5.3.4.6 The
46、rmometer 15 C to 30 C readable to 0,1 C. 5.3.4.7 Compressed air under 500 kPa. 5.3.4.8 Analytical balance capable of weighing up to 500 g with an accuracy of 0,01 g. 5.3.4.9 Desiccator. 5.3.4.10 Oven capable of being controlled at (105 2) C. 5.3.5 Preparation of sample Dry a sufficient quantity of I
47、SFM at 105 C in the beaker (5.3.4.2) to constant mass, return to ambient temperature in the desiccator (5.3.4.9). The mass of test sample (m) required depends on the dimensions of the filter cake holder (see 5.3.6) and is given by the following equation: m = S h G 1,1 (2) where G is the cake density
48、 of the ISFM, in kilograms per cubic metre; S is the surface of the cake, in square centimetres; h is the height of the cake, in centimetres; 1,1 is a factor to ensure that a sufficiently large test sample is taken. EN 12902:2004 (E) 11 5.3.6 Procedure Select a filter cake holder suitable for the qu
49、ality of the filter material to be tested on the basis of its assumed permeability, according to Table 2: Table 2 Characteristics for the selection of the filter cake Presumed permeability Darcy 10 -13m 2Height of cake holder cm Percolated volume ml Driving pressure kPa 0,01 to 0,4 0,0987 to 3,95 2,2 30 200 0,4 to 0,9 3,95 to 8,88 3,6 30 200 0,9 to 15 8,88 to 157 3,6 140 50 15 to
