1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12126:2012Chemicals used for treatmentof water intended for humanconsumption LiquefiedammoniaCopyright European Committee for Standardization Provided by IHS under license
2、with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12126:2012. Itsupersedes BS EN 12126:2005 which is withdrawn.The UK participation in its preparation was e
3、ntrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of 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 correct
4、application. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77782 0ICS 13.060.20; 71.100.80Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and
5、Strategy Committee on 31 January 2013.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EUROPEAN STANDARD NORME
6、 EUROPENNE EUROPISCHE NORM EN 12126 November 2012 ICS 71.100.80 Supersedes EN 12126:2005English Version Chemicals used for treatment of water intended for human consumption - Liquefied ammonia Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Ammoniac liqufiProd
7、ukte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Ammoniak, flssig This European Standard was approved by CEN on 23 September 2012. 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
8、 national standard without any alteration. Up-to-date lists 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).
9、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 Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyp
10、rus, 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 United Ki
11、ngdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12126:2012: ECopy
12、right European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity c
13、riteria 75 Test methods 86 Labelling Transportation Storage . 12Annex A (informative) General information on liquefied ammonia 16Annex B (normative) General rules relating to safety . 17Bibliography . 18Copyright European Committee for Standardization Provided by IHS under license with CENNot for Re
14、saleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 3 Foreword This document (EN 12126:2012) 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
15、 status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2013, and conflicting national standards shall be withdrawn at the latest by May 2013. Attention is drawn to the possibility that some of the elements of this document may be the subjec
16、t of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12126:2005. The significant technical differences between this edition and EN 12126:2005 are as follows: Modification of 6.2 on labelling, deletion of the r
17、eference to EU Directive 80/778/EEC of 15 July 1980 in order to take account of the latest Directive in force. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
18、 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
19、and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of
20、 water intended for human consumption caused by the product covered by this European Standard: a) this European Standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted that, while awaiting the ado
21、ption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. NOTE Conformity with this European Standard does not confer or imply acceptance or approval of the product in any of the Member States of the EU or EFTA
22、. The use of the product covered by this European Standard is subject to regulation or control by National Authorities. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 1212
23、6:2012EN 12126:2012 (E) 5 1 Scope This European Standard is applicable to liquefied ammonia used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements of liquefied ammonia and refers to the corresponding analytical methods. It gives in
24、formation for its use in water treatment. It also determines the rules relating to the safe handling and use of liquefied ammonia (see Annex B). 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application.
25、 For dated references, only the edition cited applies. For undated references, 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) ISO 7103, Liquefied anhydrous ammonia for indust
26、rial use Sampling Taking a laboratory sample ISO 7105, Liquefied anhydrous ammonia for industrial use Determination of water content Karl Fischer Method ISO 7106, Liquefied anhydrous ammonia for industrial use Determination of oil content Gravimetric and infra-red spectrometric methods 3 Description
27、 3.1 Identification 3.1.1 Chemical name Ammonia liquefied, anhydrous. 3.1.2 Synonym or common name Ammonia. 3.1.3 Relative molecular mass 17,03. 3.1.4 Empirical formula NH3. 3.1.5 Chemical formula NH3. 3.1.6 CAS Registry Number 1)7664-41-7. 1) Chemical Abstracts Service Registry Number. Copyright Eu
28、ropean Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 6 3.1.7 EINECS reference 2)231-635-3. 3.2 Commercial form The product is available as liquefied gas. 3.3 Phy
29、sical properties 3.3.1 Appearance and odour The product is colourless liquid with a characteristic pungent odour. 3.3.2 Density The density of the gas is 0,771 g/l at 101,3 kPa 3)and 0 C. The density of the liquid is 0,682 g/ml at 101,3 kPa and -34 C, and 0,61 g/ml at 850 kPa and 20 C. 3.3.3 Solubil
30、ity (in water) The solubility of the product in water is 900 g/l at 0 C, 520 g/l at 20 C, and 407 g/l at 30 C. 3.3.4 Vapour pressure The vapour pressure of the product is 400 kPa at 0 C, 850 kPa at 20 C and 2 035 kPa at 50 C. 3.3.5 Boiling point at 100 kPa 3)The boiling point of the product is -33,4
31、 C at 101,3 kPa. 3.3.6 Melting point The melting point of the product is -77,7 C at 101,3 kPa. 3.3.7 Specific heat The specific heat of the product is 4,61 kJ/(kg K) at 0 C and 4,86 kJ/(kg K) at 40 C. 3.3.8 Viscosity, dynamic The viscosity of the product is 0,254 mPa.s at 33 C and 101,3 kPa. 3.3.9 C
32、ritical temperature 132,4 C. 3.3.10 Critical pressure 11 450 kPa. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without
33、 license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 7 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Ammonia reacts violently with halogens, acids, acid halides, acid anhydrides and oxidising agents. It reacts with zinc, copper, tin and their alloys. Mixtures of volume fraction
34、 of 15 % to 30 % of ammonia with air are explosive. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for liquefied ammonia used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. De
35、pending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for
36、 treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the product not stated in this product standard. Limits have been given for impurities and chemical parameters where these are likely to be p
37、resent in significant quantities from the current production process and raw materials. If the production process or raw materials leads to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product Liquefie
38、d ammonia shall not contain less than a mass fraction of 99,8 % of NH3. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 Impurities Impurity Limit Water max Mass fraction 0,1 % Permanent gases and methane max Volume fraction 0,1 % Oil ma
39、x 5 mg/kg 4.4 Chemical parameters The chemicals parameters defined in the EU Water Directive (see 1) are not found in liquefied ammonia. Cyanides, pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process. Copyright European Committee for Standardization Provid
40、ed by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 8 5 Test methods 5.1 Sampling Follow the sampling method according to ISO 7103. 5.2 Analyses 5.2.1 Main product The ammonia concentration is calculated
41、 by subtracting the contents of the main impurities from mass fraction 100 %. 5.2.2 Impurities 5.2.2.1 Water The water content shall be determined in accordance with ISO 7105. 5.2.2.2 Oil content The oil content shall be determined in accordance with ISO 7106. 5.2.3 Permanent gases and methane 5.2.3
42、.1 Principle The method is a gas chromatographic determination of inert gases and methane in liquid ammonia, determined as a volume fraction. The content of trace contaminants is determined by gas chromatography according to an external standard method. Metering from the gas pipette is carried out b
43、y means of pressure-controlled feed via a fixed-volume sampling valve. Liquefied ammonia is evaporated prior to the gas chromatographic test in a special steel gas pipette. 5.2.3.2 Reagents and materials 5.2.3.2.1 Reagents All reagents shall be of a recognised analytical grade and the water used sha
44、ll conform to the grade 3 specified in EN ISO 3696. 5.2.3.2.2 Carrier gas Helium, minimum purity volume fraction 99,9 %. 5.2.3.2.3 Calibration gas mixture of the following composition: hydrogen volume fraction 91 %; nitrogen volume fraction 5 %; methane volume fraction 3 %; Copyright European Commit
45、tee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12126:2012EN 12126:2012 (E) 9 sum of oxygen and argon volume fraction 1 %. 5.2.3.2.4 Material for preparation of the column Molecular sieve 13 X of p
46、article size 250 m to 360 m, or any other equivalent suitable material. 5.2.3.3 Apparatus 5.2.3.3.1 Gas chromatographic apparatus. Any suitable gas chromatograph, fitted with a thermal conductivity detector, may be used. 5.2.3.3.1.1 Characteristics of the gas chromatographic apparatus: Column temper
47、ature: typically 40 C isothermal conditions. Detector temperature: typically 130 C. Filament temperature: typically 200 C. 5.2.3.3.1.2 Carrier gas flow rate The carrier gas flow rate shall be approximately 25 ml/min. It is usually measured at column outlet and at ambient temperature. 5.2.3.3.2 Injec
48、tion equipment. Stainless steel gas sample valve with a loop of 2 ml capacity, operating under the following conditions: temperature: ambient to 50 C; pressure: atmospheric. 5.2.3.3.3 Column. 5.2.3.3.3.1 Construction The column may be made of any suitable material that does not react with the test portion, for example stainless steel. Typical dimensions are as follows: a) length: according to the test method used but typically 4 m; b) diameter: internal diameter approximately 3,2 mm;
