1、BSI Standards PublicationBS EN 1420:2016Influence of organic materialson water intended forhuman consumption Determination of odour andflavour assessment of water inpiping systemsBS EN 1420:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1420:2016.It supers
2、edes BS EN 1420-1:1999 which is withdrawn.Further information can be obtained for UK approvals from theDrinking Water Inspectorate and the Water Regulations AdvisoryScheme.The UK participation in its preparation was entrusted to TechnicalCommittee EH/6, Effects of materials on water quality.A list o
3、f organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited
4、 2016ISBN 978 0 580 86031 7ICS 13.060.20; 67.250Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDat
5、e T e x t a f f e c t e dBS EN 1420:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1420 January 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 wate
6、r in piping systems Influence des matriaux organiques sur leau destine la consommation humaine - Dtermination 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 Wasser
7、s in RohrleitungssystemenThis European Standard was approved by CEN on 27 November 2015. 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 lis
8、ts and bibliographical references concerning such national standards may be obtained on application to the 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
9、 the responsibility of a CEN member into its own language and notified to the CEN-CENELEC 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, Former Yu
10、goslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPE
11、N DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 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 EBS EN 1420:2016EN 1420:2016 (E) 2 Contents Page Euro
12、pean foreword . 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Terms and definitions . 6 4 Principle . 8 5 Reagents . 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
13、.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 Preparation 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
14、.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 9.3 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
15、procedure 13 10.1 General . 13 10.2 Cold water test procedure. 13 10.3 Elevated temperature test procedure 14 11 Determination 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
16、 products . 16 13.4 Information on the test procedure 16 13.5 Test results . 16 BS EN 1420:2016EN 1420:2016 (E) 3 Annex 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 fla
17、vour testing . 22 C.1 General . 22 C.2 Individual TON determination . 22 C.3 Ranking test 23 C.4 Long term monitoring . 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 succe
18、ssive dilutions . 24 D.2 Series of successive 1-butanol concentrations 24 D.2.1 1-butanol spike solution 24 D.2.2 Series of successive dilutions . 25 Bibliography . 26 BS EN 1420:2016EN 1420:2016 (E) 4 European foreword This document (EN 1420:2016) has been prepared by Technical Committee CEN/TC 164
19、 “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 July 2016, and conflicting national standards shall be withdrawn at the latest by July 2
20、016. 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 1420-1:1999. This document has been prepared under a
21、mandate given to CEN by the European Commission and the European Free Trade Association. With regard to the former 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 introduce
22、d, the preparation of the migration waters has been specified and is now in accordance with EN 12873-1, the scope 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
23、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, Former Yugoslav Republic of Macedonia, France, Germany, Gree
24、ce, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1420:2016EN 1420:2016 (E) 5 Introduction In respect of potential adverse effects on the qua
25、lity of the water intended for human consumption, arising from contact with materials used for conveying and distribution, it is recalled to mind that, national regulations remain in force. BS EN 1420:2016EN 1420:2016 (E) 6 1 Scope This European Standard specifies a procedure for obtaining a migrati
26、on water to determine odour and flavour for products made from organic materials intended to come in 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 us
27、ed under various conditions for the transport, storage and distribution of water intended for human 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 rel
28、evant national regulations and/or the system or product standards. 2 Normative references The following 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,
29、 the latest edition of the referenced document (including any amendments) applies. EN 1622:2006, Water 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 migrati
30、on Part 1: Test method for factory-made products made from or incorporating organic or glassy (porcelain/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-app
31、lied materials EN ISO 7393-2, Water quality Determination of free chlorine and total chlorine Part 2: 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
32、 apply. 3.1 odour organoleptic attribute perceptible by the olfactory organ on sniffing certain volatile 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
33、 kinaesthesic effects (EN ISO 5492) 3.3 threshold odour number TON dilution ratio beyond which the diluted sample does not have any perceptible odour SOURCE: EN 1622:2006, 3.3 BS EN 1420:2016EN 1420:2016 (E) 7 3.4 threshold flavour number TFN dilution ratio beyond which the diluted sample does not h
34、ave any perceptible flavour SOURCE: EN 1622:2006, 3.4 3.5 test water water without any perceptible 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 wate
35、r test water which has been kept at the same specified conditions as migration water but without 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 requirement
36、s of EN 1622 3.10 product manufactured item, in its finished form 3.11 site-applied product product 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 conta
37、ct with drinking water EXAMPLES Taps, valves, water filters. 3.13 membranes elastomer as used in 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 BS EN 1420:2016EN 1420:2016 (E) 8 3.15 test piece sample or po
38、rtion of sample that is conditioned, treated or otherwise prepared to be tested to obtain 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
39、Principle Following a defined pretreatment procedure of flushing, stagnation with test water 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 foll
40、ows: test pieces are put in contact with chlorinated and where required unchlorinated test 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, a
41、dditionally a cold water test shall be performed. NOTE The choice of the type of test water (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 migrati
42、on water is assessed by a test panel to determine the TON and TFN (see Clause 11). Additional 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 an
43、y perceptible odour and flavour, and conform to the reference water in EN 1622. 5.1.2 Chlorinated 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
44、 72 h (see 11.1) with sodium thiosulfate (5.3) or ascorbic acid (5.4), it shall have no perceptible 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) a
45、nd having a known concentration of about 0,1 % by mass of free chlorine determined in accordance 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 pe
46、r 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 water. BS EN 1420:2016EN 1420:2016 (E) 9 Occasionally this solut
47、ion causes odours/flavours that interfere with analyses. An alternative (5.4) is available. 5.4 Ascorbic acid solution. Ascorbic acid solution, comprising a solution of 4,0 g per litre of L (+)-ascorbic acid analytical grade, stored in the absence of light at a temperature below 10 C, for a maximum
48、of one month. 2 ml of this solution will neutralize 1 mg l1of residual chlorine in 1 l of water. 5.5 1-Butanol (analytic reagent grade). 5.6 2-Methoxy-2-methylpropane (Methyl-tert-butyl ether, MtBE) (analytic reagent grade). 5.7 Methanol (analytic reagent grade). 5.8 Cleaning liquids for glassware:
49、5.8.1 Hydrochloric acid, concentrated (30 % mass per volume) analytical reagent grade. 5.8.2 Hydrochloric acid solution, prepared by slowly adding (0,5 0,01) l of concentrated hydrochloric acid (5.8.1) to (0,5 0,01) l of test water (5.1.1). NOTE Care is needed because preparing the solution may generate heat. 5.8.3 Nitric acid, concentrated (65 % mass per volume) analytical reagent grade. 5.8.4 Nitric acid solution, (2 % mass per volume) is prepared by slowly adding (0,15 0,01) l of concentrated nitric acid (5.8.3) to (5,0
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