1、May 2016 English price group 13No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 13.060.20; 67.250This standard has b
2、een included in the body of DVGW Technical Rules.!%UVv“2505183www.din.deDIN EN 1420Influence of organic materials on water intended for human consumption Determination of odour and flavour assessment of water in piping systems;English version EN 1420:2016,English translation of DIN EN 1420:2016-05Ei
3、nfluss von organischen Werkstoffen auf Wasser fr den menschlichen Gebrauch Bestimmung des Geruchs und Geschmacks des Wassers in Rohrleitungssystemen;Englische Fassung EN 1420:2016,Englische bersetzung von DIN EN 1420:2016-05Influence des matriaux organiques sur leau destine la consommation humaine D
4、termination de lodeur et de la flaveur de leau dans les rseaux de conduites;Version anglaise EN 1420:2016,Traduction anglaise de DIN EN 1420:2016-05SupersedesDIN EN 1420-1:1999-11www.beuth.deDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authori
5、tative.Document comprises 28 pages 05.16 2 A comma is used as the decimal marker. National foreword This document (EN 1420:2016) has been prepared by Technical Committee CEN/TC 164 “Water supply” (Secretariat: AFNOR, France). The preliminary work was done by Working Group WG 3 “Effects of materials
6、in contact with drinking water” of CEN/TC 164. The responsible German body involved in its preparation was DIN-Normenausschuss Wasserwesen (DIN Standards Committee Water Practice), DIN-DVGW Joint Working Committee NA 119-07-09 AA Werkstoffe im Kontakt mit Trinkwasser. Amendments This standard differ
7、s from DIN EN 1420-1:1999-11 as follows: a) the test method for TON and TFN according to EN 1622 has been specified; b) a procedure for the panel qualification has been introduced; c) the preparation of migration waters has been specified and is now in accordance with EN 12873-1; d) the scope of the
8、 standard has been extended: all organic products in contact with drinking water (including coatings and site-applied products) can now be tested according to this standard. Previous editions DIN EN 1420-1: 1999-11 DIN EN 1420:2016-05 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1420 January
9、 2016 ICS 13.060.20; 67.250 Supersedes EN 1420-1:1999English Version Influence of organic materials on water intended for human consumption - Determination of odour and flavour assessment of water in piping systems Influence des matriaux organiques sur leau destine la consommation humaine - Dtermina
10、tion de lodeur et de la flaveur de leau dans les rseaux de conduitesEinfluss von organischen Werkstoffen auf Wasser fr den menschlichen Gebrauch - Bestimmung des Geruchs und Geschmacks des Wassers in RohrleitungssystemenThis European Standard was approved by CEN on 27 November 2015. CEN members are
11、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 th
12、e CEN-CENELEC 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-CENELEC Management Cent
13、re 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuani
14、a, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000
15、 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1420:2016 EEN 1420:2016 (E) 2 Contents Page European foreword . 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Terms and definitions . 6 4 Principle . 8 5 Reagen
16、ts . 8 6 Apparatus . 9 7 Sampling, transport, storage, and preparation of test pieces 10 7.1 General . 10 7.2 Site-applied products 10 7.3 Surface-area-to-volume ratio (S/V) . 10 7.3.1 General . 10 7.3.2 Pipes 11 7.3.3 Fittings, ancillaries and membranes . 11 7.3.4 Site-applied products 11 8 Prepara
17、tion of reagents and apparatus . 11 8.1 Test water . 11 8.2 Test water with chlorine content . 11 8.3 Cleaning of glassware . 12 9 Pretreatment of test pieces 12 9.1 General . 12 9.2 Test pieces to be tested at (23 2) C (Cold water test) . 12 9.2.1 Flushing . 12 9.2.2 Stagnation with test water 12 9
18、.3 Test pieces to be tested at elevated temperature (60 C or 85 C) . 13 9.3.1 Flushing . 13 9.3.2 Stagnation with test water at elevated temperature 13 9.4 Prewashing . 13 10 Test procedure 13 10.1 General . 13 10.2 Cold water test procedure. 13 10.3 Elevated temperature test procedure 14 11 Determi
19、nation of TON and TFN . 14 12 Expression of results . 15 13 Test report 15 13.1 General information 15 13.2 Information on the product/material 15 13.3 Information for site-applied products . 16 13.4 Information on the test procedure 16 13.5 Test results . 16 DIN EN 1420:2016-05 EN 1420:2016 (E) 3 A
20、nnex A (informative) Schematic presentation of test method 18 Annex B (normative) Sequence of additional migration periods . 20 Annex C (normative) Panel qualification for odour and flavour testing . 22 C.1 General . 22 C.2 Individual TON determination . 22 C.3 Ranking test 23 C.4 Long term monitori
21、ng . 23 Annex D (informative) Preparation of dilution series for panel qualification 24 D.1 Series of successive MtBE dilutions . 24 D.1.1 MtBE spike solution . 24 D.1.2 Series of successive dilutions . 24 D.2 Series of successive 1-butanol concentrations 24 D.2.1 1-butanol spike solution 24 D.2.2 S
22、eries of successive dilutions . 25 Bibliography . 26 DIN EN 1420:2016-05 EN 1420:2016 (E) 4 European foreword This document (EN 1420:2016) 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 o
23、f a national standard, either by publication of an identical text or by endorsement, at the latest by July 2016, and conflicting national standards shall be withdrawn at the latest by July 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of pa
24、tent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1420-1:1999. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. With regard to the fo
25、rmer edition EN 1420-1:1999, the following changes were made: the test method for TON /TFN according to EN 1622 has been specified, a procedure for the panel qualification has been introduced, the preparation of the migration waters has been specified and is now in accordance with EN 12873-1, the sc
26、ope of the standard has been extended: all organic products in contact with drinking water (including coatings and side applied products) can be tested according to this standard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are b
27、ound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portu
28、gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 1420:2016-05 EN 1420:2016 (E) 5 Introduction In respect of potential adverse effects on the quality of the water intended for human consumption, arising from contact with materials used for conveying
29、and distribution, it is recalled to mind that, national regulations remain in force. DIN EN 1420:2016-05 EN 1420:2016 (E) 6 1 Scope This European Standard specifies a procedure for obtaining a migration water to determine odour and flavour for products made from organic materials intended to come in
30、 contact with water for human consumption (drinking water) and used in piping systems. Such products include pipes, fittings, ancillaries and coatings. This standard is applicable to products to be used under various conditions for the transport, storage and distribution of water intended for human
31、consumption and raw water used for the manufacture of water intended for human consumption. This standard specifies a test method comprising of a set of procedures. The use may be dependent on the relevant national regulations and/or the system or product standards. 2 Normative references The follow
32、ing documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1622:2006, Wat
33、er quality Determination of the threshold odour number (TON) and threshold flavour number (TFN) EN 12873-1:2014, Influence of materials on water intended for human consumption Influence due to migration Part 1: Test method for factory-made products made from or incorporating organic or glassy (porce
34、lain/vitreous enamel) materials EN 12873-2, Influence of materials on water intended for human consumption Influence due to migration Part 2: Test method for non-metallic and non-cementitious site-applied materials EN ISO 7393-2, Water quality Determination of free chlorine and total chlorine Part 2
35、: Colorimetric method using N, N-diethyl-1, 4-phenylenediamine, for routine control purposes (ISO 7393-2) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 odour organoleptic attribute perceptible by the olfactory organ on sniffing certain vola
36、tile substances (EN ISO 5492) 3.2 flavour complex combination of the olfactory, gustatory and trigeminal sensations perceived during tasting which may be influenced by tactile, thermal, painful and/or kinaesthesic effects (EN ISO 5492) 3.3 threshold odour number TON dilution ratio beyond which the d
37、iluted sample does not have any perceptible odour SOURCE: EN 1622:2006, 3.3 DIN EN 1420:2016-05 EN 1420:2016 (E) 7 3.4 threshold flavour number TFN dilution ratio beyond which the diluted sample does not have any perceptible flavour SOURCE: EN 1622:2006, 3.4 3.5 test water water without any percepti
38、ble odour and flavour used for testing purposes prepared as described in 5.1.1 and 5.1.2 3.6 migration water test water which has been in contact with a test piece under specified conditions 3.7 blank water test water which has been kept at the same specified conditions as migration water but withou
39、t contact with the test piece 3.8 prewashing water tapwater without any odour and flavour and a chlorine content less than 0,05 mg/l as Cl23.9 testing panel group of people meeting the relevant requirements of EN 1622 3.10 product manufactured item, in its finished form 3.11 site-applied product pro
40、duct where the final surface in contact with drinking water is prepared on site 3.12 fitting, ancillary complete functional unit made up of one or more components and materials, parts of which are in contact with drinking water EXAMPLES Taps, valves, water filters. 3.13 membranes elastomer as used i
41、n pressure relief devices 3.14 sample one or more units, or a specified quantity, drawn from a batch or lot, selected at random for inspection DIN EN 1420:2016-05 EN 1420:2016 (E) 8 3.15 test piece sample or portion of sample that is conditioned, treated or otherwise prepared to be tested to obtain
42、a single test result 3.16 panel coordinator person responsible for the qualification of the members of the odour/flavour panel (panellists) and the check of the reliability of the determined TON-/TFN-results 4 Principle Following a defined pretreatment procedure of flushing, stagnation with test wat
43、er and then prewashing, the surface of the test pieces, exposed in practice to drinking water, is brought into contact with test waters. The migration procedure is carried out under specified conditions as follows: test pieces are put in contact with chlorinated and where required unchlorinated test
44、 waters for 72 h at 23 C (cold water test), or put in contact with unchlorinated test water for 24 h at a temperature of 60 C (warm water test) or 85 C (hot water test). If warm or hot water test is required, additionally a cold water test shall be performed. NOTE The choice of the type of test wate
45、r (chlorinated and/or chlorine-free), the temperature of the test water, the number of additional migration periods will be specified in product standards or national regulations. After this contact the migration water is assessed by a test panel to determine the TON and TFN (see Clause 11). Additio
46、nal information concerning the temperature to be used in the test and the sequence of extraction periods is given in Clause 10. 5 Reagents 5.1 Waters to be used for testing. 5.1.1 Test water shall be without any perceptible odour and flavour, and conform to the reference water in EN 1622. 5.1.2 Chlo
47、rinated test water shall consist of test water (5.1.1) with a free chlorine content of (1 0,2) mg/l as Cl2after addition of sodium hypochlorite solution (5.2). When chlorinated test water is dechlorinated after 72 h (see 11.1) with sodium thiosulfate (5.3) or ascorbic acid (5.4), it shall have no pe
48、rceptible odour and flavour. 5.2 Sodium hypochlorite solution. Sodium hypochlorite solution, prepared from a technical or general purpose reagent grade of sodium hypochlorite (NaOCl), using test water (5.1.1) and having a known concentration of about 0,1 % by mass of free chlorine determined in acco
49、rdance with EN ISO 7393-2. This sodium hypochlorite solution is unstable and should be prepared on the day of use. 5.3 Sodium thiosulfate solution. Sodium thiosulfate solution, comprising a solution of 3,5 g per litre of sodium thiosulfate pentahydrate (Na2S2O35H2O) analytical grade, stored in the absence of light at a temperature below 10 C, for a maximum of 1 week. 2 ml of this solution will neutralize 1 mg l1of residual chlorine in 1 l of
