SIST EN 1420:2016

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vpliv organskih snovi na pitno vodo - Ugotavljanje vonja in okusa vode v vodovodnih inštalacijahEinfluss von organischen Werkstoffen auf Wasser für den menschlichen Gebrauch - Bestimmung des Geruchs und Geschmacks des Wassers in RohrleitungssystemenInfluence des matériaux organiques sur l'eau destinée à la consommation humaine - Détermination de l'odeur et de la flaveur de l'eau dans les réseaux de conduitesInfluence of organic materials on water intended for human consumption - Determination of odour and flavour assessment of water in piping systems91.140.60Sistemi za oskrbo z vodoWater supply systems13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 1420:2016SIST EN 1420:2016en,fr,de01-marec-2016SIST EN 1420:2016SLOVENSKI
STANDARDSIST EN 1420-1:20001DGRPHãþD



SIST EN 1420:2016



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1420
January
t r s x ICS
s uä r x rä t râ
x yä t w r Supersedes EN
s v t ræ sã s { { {English Version
Influence of organic materials on water intended for human consumption æ Determination of odour and flavour assessment of water in piping systems Influence des matériaux organiques sur l 5eau destinée à la consommation humaine æ Détermination de l 5odeur et de la flaveur de l 5eau dans les réseaux de conduites Einfluss von organischen Werkstoffen auf Wasser für den menschlichen Gebrauch æ Bestimmung des Geruchs und Geschmacks des Wassers in RohrleitungssystemenThis European Standard was approved by CEN on
t y November
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
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Avenue Marnix 17,
B-1000 Brussels
9
t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s v t rã t r s x ESIST EN 1420:2016



EN 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 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 7.3.1 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 9.2 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 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 products . 16 13.4 Information on the test procedure . 16 13.5 Test results . 16 SIST EN 1420:2016



EN 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 flavour 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 successive 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
SIST EN 1420:2016



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 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 2016. 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 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 introduced, — 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 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 1420:2016



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 and distribution, it is recalled to mind that, national regulations remain in force. SIST EN 1420:2016



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 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 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 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, 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 migration — 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-applied 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 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 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] SIST EN 1420:2016



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 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 water 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 Cl2 3.9 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 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 contact 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 SIST EN 1420:2016



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 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 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 follows: 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, additionally 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 migration 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 any 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 Cl2 after 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 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) and 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 per litre of sodium thiosulfate pentahydrate (Na2S2O3 ®5H2O) 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 l «1 of residual chlorine in 1 l of water. SIST EN 1420:2016



EN 1420:2016 (E) 9 Occasionally this solution 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 of one month. 2 ml of this solution will neutralize 1 mg l «1 of 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: 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 ± 0,1) l of test water (5.1.1). NOTE Care is needed because preparing the solution may generate heat. 5.8.5 Hydrogen peroxide, 3 % vol/vol (analytical reagent grade). 6 Apparatus 6.1 Vessels, containers, stoppers and connectors, shall consist of a material, such as glass, PTFE or stainless steel, that is inert under the specific test conditions. The material PTFE should only be used when there is a small contact area with the test water. Thus PTFE is unsuitable for containers. 6.2 Plates stainless steel, mild steel, sand-blasted glass or concrete/cement-mortar plates, for testing certain site-applied products. The plates shall be covered completely by the test material. 6.3 Equipment capable of maintaining the appropriate migration temperature, e.g (23 ± 2) °C, (60 ± 2) °C or (85 ± 2) °C. 6.4 500 ml Erlenmeyer flasks with ground stoppers shall be used for the presentation of the dilution series to the panellists. SIST EN 1420:2016



EN 1420:2016 (E) 10 7 Sampling, transport, storage, and preparation of test pieces 7.1 General 7.1.1 Sampling of products (i.e. collection of (a) sample(s) from a batch of lot) shall be performed in accordance with the relevant product standard, system standard or the national regulations when applicable. 7.1.2 During transport and storage samples shall be protected from contamination. If the manufacturer provides written transport and storage instructions they shall be followed. The samples shall be transported and stored in their original form as delivered. Transport storage and test containers shall be clean. 7.1.3 The room used for sample and test piece preparation shall be free from odour and flavour. The general environment shall not adversely affect the preparation (see EN 1622). 7.1.4 The test pieces shall be prepared such that only the surface intended to come into contact with drinking water is exposed to the test waters (5.1.1 and 5.1.2). When the product has the same material composition for the outside and inside surfaces, the test pieces may be immersed in test water. 7.1.5 The surface of the test pieces intended to come into contact with test water shall be free from adhesive tape, labels, ink or pencil marks. 7.2 Site-applied products Test samples for site-applied products shall be prepared, stored and transported in accordance to EN 12873-2 and 7.1.3. 7.3 Surface-area-to-volume ratio (S/V) 7.3.1 General The surface area of the test pieces exposed to the test water shall be in accordance with Table 1. If S/V of the test pieces is larger than specified in Table 1 the migration water may be diluted with test water up to the given value prior determination of TON and TFN. Table 1 — S/V ratios for testing Type of product S/V in dm1 Pipes (service and domestic pipes) DN-ID < 80 5 < S/V
¶ 40 (fill pipe) Pipes (distribution pipe) 80
¶ DN-ID < 300
· 2,5 (fill pipe) Pipes (large distribution) DN-ID
· 300 2,5 (fill with cylinder inserteda or fill pipe) Fittings, ancillaries and membranes 1,5b Sealings and adhesives 0,2 (immersing product) a
See EN 12873–1:2014, Annex B. b
This covers a wide range of products. This means the product may be filled, immersed, dismantled or other alternative procedure (the details of testing shall be fully described in the test report). SIST EN 1420:2016



EN 1420:2016 (E) 11 The surface-area-to-volume ratio, S/V, shall be expressed per decimetre, i.e. dm «1 (which is dm2/dm3 or dm2 /l), where: — S is the surface area of the test piece in contact with the test water, in square decimetres; — V is the volume of test water in contact with the test piece, in litres. 7.3.2 Pipes Pipes are filled for testing. The S/V for testing is determined by the pipe under test. For a group of products made using the same process and having a range of DNs only the product with the highest S/V ratio (smallest diameter) need to be tested. However, if for the smallest diameter the S/V ratio is higher than 40 dm «1 (i.e. DN-ID < 10 mm) then the next larger diameter with S/V
¶ 40 dm «1 shall be tested. If for a group of products (pipes with different diameter) the smallest produced diameter is DN-ID > 80 mm then the pipe with the smallest ID shall be tested according to EN 12873-1:2014, Annex B. For each test, take from a pipe sample a test piece of sufficient length to give the internal volume (V) of the test water necessary. 7.3.3 Fittings, ancillaries and membranes 7.3.3.1 For each test take one or more fitting or ancillary to give the internal volume of the test water sufficient to provide enough water for the odour and flavour assessment procedure. This volume of test water is V in l. When it is not possible to obtain enough migration water for the odour and flavour assessment by filling the product, the procedures 7.1.4 and 7.3.3.2 shall be applied, taking into account the calculated surface area-to-volume S/V ratio. 7.3.3.2 When the outside and the inside surfaces of the product have a different material composition, and therefore cannot be immersed in the test water the product shall be tested in the form of a more convenient test piece, prepared under the same manufacturing and processing conditions as for the product. It is also possible to test the dismantled parts of the products having contact with the drinking water and made of the same material. 7.3.4 Site-applied products The S/V for products that are applied to plates for testing shall be according to 7.2. If products are immersed in test water then adjustments shall be made to account for the surface area in contact with test water being larger than in practice. 8 Preparation of reagents and apparatus 8.1 Test water Determine that the water conforms to 5.1.1 for odour and/or flavour using the procedure given in Clause 11. If the water has a perceptible odour or flavour, then reject the batch of water and test another batch or source of water. 8.2 Test water with chlorine content Add a sufficient quantity of sodium hypochlorite solution (5.2) to the test water (8.1) to give a final free residual chlorine concentration of (1,0 ± 0,2) mg/l as Cl2 analysed in accordance with EN ISO 7393-2. SIST EN 1420:2016



EN 1420:2016 (E) 12 8.3 Cleaning of glassware 8.3.1 Clean glassware using a non-perfumed biodegradable detergent. Rinse glassware in test water (8.1). 8.3.2 Clean the inner surface of glassware with hydrochloric acid (5.8.2) or nitric acid solution (5.8.4) and rinse it in test water (8.1). If further cleaning of the inner surface is necessary, repeat the cleaning using hydrogen peroxide (5.8.5) followed by rinsing with test water (8.1). 8.3.3 Before use, rinse the glassware at least three times with test water (8.1). NOTE Erlenmeyer flasks with ground stoppers used for the presentation of the dilution series may have a glassy smell. The complete filling of the flask with test water without a stopper and the exposure overnight or the use of freshly cleaned flasks is suitable to eliminate this smell. 9 Pretreatment of test pieces 9.1 General 9.1.1 Test pieces are pretreated prior to migration testing by procedures involving flushing, stagnation and prewashing. 9.1.2 For site-applied products start the pretreatment immediately after the curing period specified by either regulations or the manufacturer, whichever is shorter. 9.1.3 If it is not possible, because of laboratory time constraints, to carry out the pretreatment and test procedure without a break, the break shall be during the pretreatment procedure. The migration periods shall be consecutive and without a break. 9.2 Test pieces to be tested at (23 ± 2) °C (Cold water test) 9.2.1 Flushing 9.2.1.1 If possible, flush test pieces with flowing tap water for (60 ± 5) min with a flushing speed of 1 m/min to 3 m/min. In order to avoid the use of large quantities of water the arrangement described in EN 12873–1:2014, Annex A may be used to flush large diameter products. 9.2.1.2 Test pieces which cannot be flushed shall be placed in an appropriate vessel, e.g. a bucket, having a flow of water from the bottom upwards such that the calculated speed with regard to the upper open surface of the vessel is 1 m/min to 3 m/min for (60 ± 5) min. 9.2.2 Stagnation with test water 9.2.2.1 Test pieces shall be immersed in, or filled with, test water (5.1.1 and/or 5.1.2) for a period of (24 ± 1) h at (23 ± 2) °C. 9.2.2.2 Remove the water. 9.2.2.3 Prewash the test pieces according to 9.4. SIST EN 1420:2016



EN 1420:2016 (E) 13 9.3 Test pieces to be tested at elevated temperature (60 °C or 85 °C) 9.3.1 Flushing Flush test pieces according to 9.2.1 9.3.2 Stagnation with test water at elevated temperature 9.3.2.1 Test
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