1、 DEUTSCHE NORMJune 2006DIN EN 12873-4 ICS 13.060.20; 67.250 Influence of materials on water intended for human consumption Influence due to migration Part 4: Test method for water treatment membranes English version of DIN EN 12873-4:2006-06 Einfluss von Materialien auf Wasser fr den menschlichen Ge
2、brauch Einfluss infolge der Migration Teil 4: Prfverfahren fr Membranen fr die Wasserbehandlung Englische Fassung DIN EN 12873-4:2006-06 Document comprises 19 pages No part of this standard may be reproduced without prior permission of DIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag Gm
3、bH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). English price group 11 www.din.de www.beuth.de !,o-J“10.06 9761039DIN EN 12873-4:2006-06 2 National foreword This standard has been prepared by CEN/TC 164 Water supply (Secretariat: France), Working Group W
4、G 3 Effect of materials in contact with drinking water (lead-managed by: the Netherlands). The responsible German body involved in its preparation was the Normenausschuss Wasserwesen (Water Practice Standards Committee), Technical Committee NA 119-04-01-01 UA Werkstoffe und Bauteile (Bedarfs-gegenst
5、nde) in Kontakt mit Trinkwasser. The national standards bodies are bound to adopt this European Standard in its entirety and without any modifications. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12873-4 March 2006 ICS 13.060.20; 67.250 English Version Influence of materials on water intend
6、ed for human consumption - Influence due to migration - Part 4: Test method for water treatment membranes Influence des matriaux sur leau destine la consommation humaine - Influence due la migration - Partie 4 : Mthode dessai des membranes des systmes de traitement deau Einfluss von Materialien auf
7、Wasser fr den menschlichen Gebrauch - Einfluss infolge der Migration - Teil 4: Prfverfahren fr Membranen fr die Wasserbehandlung This European Standard was approved by CEN on 3 February 2006. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
8、 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 official
9、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 Austria, Belgi
10、um, 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. EUROPEAN COMMITTEE FOR STANDARDIZ
11、ATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12873-4:2006: EEN 12873-4:2006 (E) 2 Contents Page Fore
12、word 3 Introduction . 4 1 Scope 5 2 Normative references . 5 3 Terms and definitions. 5 4 Symbols and abbreviations . 6 5 Test method. 6 5.1 Principle . 6 5.2 Reagents and apparatus 7 5.2.1 General 7 5.2.2 Test water 7 5.2.3 Flushing water 7 5.2.4 Cleaning agent. 7 5.2.5 Procedural blank 8 5.2.6 Tes
13、t rig . 8 5.3 Test samples 8 5.3.1 General requirements 8 5.3.2 Sample storage 9 5.4 Procedure. 9 5.4.1 Test temperature 9 5.4.2 Start up procedure . 9 5.4.3 Leaching test 9 5.4.4 Cleaning and disinfection. 11 6 Analysis 13 7 Expression of results 13 7.1 Concentrations in the extracts . 13 7.2 Daily
14、 migration rates 13 7.2.1 Calculation based on concentrations in extracts from one-pass sampling, T1to T3. 13 7.2.2 Calculation based on concentrations in leachates after re-circulation, R1and R214 8 Test report 14 Annex A (informative) Diagram of the test procedure. 15 Annex B (informative) Schemat
15、ic diagram of an example test rig . 16 Bibliography 17 EN 12873-4:2006 (E) 3 Foreword This document (EN 12873-4:2006) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard
16、, either by publication of an identical text or by endorsement, at the latest by September 2006, and conflicting national standards shall be withdrawn at the latest by September 2006. It is derived from a CEN Workshop Agreement prepared by the Project Team of the CEN Workshop CWA Water Treatment Mem
17、branes. This standard is one of a series of standards on test methods which support the appropriate standards. It has been drawn up with the objective to describe a test method to determine the migration of substances from water treatment membranes. Annex A, which is informative, provides a flow dia
18、gram of the steps in the test procedure. Annex B, which is informative, describes a test rig. This standard is the fourth in a series of standards dealing with the influence of migration from materials on water intended for human consumption, including: Part 1 Test method for non-metallic and non-ce
19、mentitious factory made products; Part 2 Test method for non-metallic and non-cementitious site-applied materials; Part 3 Test method for ion exchange and adsorbent resins; Part 4 Test method for water treatment membranes. According to the CEN/CENELEC Internal Regulations, the national standards org
20、anizations 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, Romania, S
21、lovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12873-4:2006 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by the materials, it is called to mind that, while awaiting the adoption of verifiable European a
22、cceptance criteria, the relevant national regulations remain in force. EN 12873-4:2006 (E) 5 1 Scope This European standard describes a test method for laboratory evaluation of possible adverse effects of water treatment membranes on drinking water quality. In principle it is applicable to microfilt
23、ration, ultrafiltration, nanofiltration, reverse osmosis and electrodialysis modules for use in the treatment of public water supplies and of water inside buildings. NOTE Such devices can vary considerably in design and operation and hence some modification of the procedures may be required. Evaluat
24、ion of the efficiency of the membrane filter in removing contaminants from the treated water is not included. 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
25、, the latest edition of the referenced document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987) 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 ana
26、lytical sample portion of the extract collected for the determination of specified water quality parameters 3.2 cell pair basic unit of ED systems consisting of a cation transfer membrane, a dilute flow (product) spacer, an anion transfer membrane and a concentrate (waste) spacer 3.3 electrodialysis
27、 process in which ionic species in a feed water are transferred by means of an electrical driving force via a membrane, which is either cation or anion specific, to a waste water stream 3.4 feed water inlet water for the test rig 3.5 leaching test/migration test determination of the effects on param
28、eters of water quality following contact with the test sample under specified conditions 3.6 leaching/migration process of transferring constituents from a material of the test sample into test water carried out under specified conditions EN 12873-4:2006 (E) 6 3.7 leachate/extract test water after e
29、xposure to the test sample 3.8 membrane module filtration element including the membrane itself and all parts of its housing and fittings 3.9 procedural blank test water after contact with the test rig but not with the test sample under the same conditions used for the leaching test 3.10 product man
30、ufactured item, in its finished form, that comes into contact with drinking water NOTE In case of membrane water treatment systems the product is a membrane module. 3.11 product water treated water from the water treatment unit 3.12 reject water tangential water that does not flow through the membra
31、ne 3.13 test rig equipment, which is not part of the test sample, used to perform the test and control test conditions 3.14 test sample product, or part of a product, submitted for testing for suitability for use in contact with water intended for human consumption 3.15 test water water used in cont
32、act with the test sample for evaluation of migration behaviour 4 Symbols and abbreviations ED Electrodialysis 5 Test method 5.1 Principle Water of specified quality is run through a membrane module under specified operating conditions representing as much as possible the actual conditions of use. Th
33、e procedure comprises several steps including flushing, operation with and without recycling and cleaning and/or disinfection, the latter depending on the manufacturers recommendations. The purpose of the recycling phase is to concentrate the potential contaminants leaching from the test sample. Sam
34、ples of the concentrates and the single-pass extracts are taken for analysis. EN 12873-4:2006 (E) 7 The operating test temperature is maintained at the highest temperature approved by the manufacturer. In the absence of a recommended temperature it is (25 5) C. A schematic diagram of the test protoc
35、ol is shown in Annex A. Water treatment devices based on membrane technology can be different in design and operation and therefore the procedures described, such as operation conditions and cleaning, may need to be modified in some cases. 5.2 Reagents and apparatus 5.2.1 General Only reagents of an
36、alytical grade shall be used, except where specified otherwise. All reagents shall be of sufficient purity to ensure that they do not give rise to interferences during the analysis of the extracts. NOTE Contamination can arise from various sources, e.g. plastics or rubber materials. The use of proce
37、dural blanks and laboratory blanks assists in detecting any contamination and identifying its source. 5.2.2 Test water The test water shall consist of purified water conforming to grade 3 of EN ISO 3696 with an electrical conductivity not exceeding (10 0,1) S/cm. It shall be free from organic contam
38、inants that can interfere with the analysis of the extracts. If testing with chlorinated test water is required then use test water according to 5.2.2 having an active chlorine content of (1 0,2) mg/l as Cl2. When testing electrodialysis modules the test water shall consist of purified water contain
39、ing (1 0,1) g/l of NaCl. NOTE Purification of water, such as tapwater, by a sequence consisting of carbon filtration, reverse osmosis or distillation and followed by deionization usually produces satisfactory test water. 5.2.3 Flushing water The flushing water should be of a similar quality to the t
40、est water (5.2.2). Good quality tap water may be used provided that the following conditions are complied with: total organic carbon content of (1,0 mg/l 0,1 mg/l) carbon; conductivity of 500 S/cm; it is free from organic contaminants that can interfere with the analysis of the extracts; flushing is
41、 finished with a volume of the test water, corresponding to (5 0,5)% of the total volume used for flushing. For products not intended for use in contact with chlorinated water only unchlorinated flushing water shall be used. 5.2.4 Cleaning agent The type and use of agents to clean and/or disinfect t
42、he test sample shall be as recommended by the manufacturer. EN 12873-4:2006 (E) 8 5.2.5 Procedural blank Before testing the filtration unit, bypass the test sample or replace it by an inert device (e.g. a piece of pipe made from the same material as the main test rig component, e.g. stainless steel)
43、. Fill the test rig with test water and subject the system to a twenty-four hour period of re-circulating flow in accordance with 5.4.3.1. Collect procedural blank analytical samples (R0) in accordance with 5.4.3.3. Run the remaining extract to waste. Flush the test rig by circulating clean test wat
44、er for (20 5) min and run to waste. Repeat this flushing once more. Fill the test rig with fresh test water. Adjust the flow of the test water through the test rig to the minimum operational rate recommended for the test sample. Collect procedural blank analytical samples (T0) in accordance with 5.4
45、.3.2. NOTE In the case where the complete water treatment unit is to be tested and no other parts are added that would be in contact with the test water, this stage may be omitted. Test water itself should then be analyzed as the procedural blanks R0and T0. 5.2.6 Test rig The test rig used is depend
46、ant on the device under test. Therefore the design and operation of the test rig for the membrane module under test shall reproduce as far as practical the conditions of actual use in service. In particular, testing shall be carried out under the same conditions, as for actual use, for the following
47、: a) start-up procedure; b) use of cleaning and/or disinfection agents; c) water treatment membrane operating conditions, as relevant. As an example for a membrane system the test rig may include a pump, a reservoir of test water, pressure gauges, flow meters, sampling taps and connecting pipes and
48、fittings. The rig shall allow temperature control, sampling of the product water, re-circulation of the product water and, where relevant, of the reject water or concentrate over a period of 24 h. The re-circulation reservoir should hold sufficient volume of the feed water to allow at least 30-minut
49、es operation at the minimum recommended flow. The different parts of the test rig shall be inert towards the test water used. NOTE A schematic diagram of an example test rig is shown in Annex B. 5.3 Test samples 5.3.1 General requirements Test samples shall be taken from normal production batches. Where a test sample cannot be taken from the production batch an alternative sample is permitted together with any necessary changes to the test procedure. Such modifications shall be fully described in the Test Report. Test
