1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12123:2012Chemicals used for treatmentof water intended for humanconsumption AmmoniumsulfateCopyright European Committee for Standardization Provided by IHS under license w
2、ith CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12123:2012. Itsupersedes BS EN 12123:2005 which is withdrawn.The UK participation in its preparation was en
3、trusted 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 correcta
4、pplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77786 8ICS 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 S
5、trategy 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 12123:2012EUROPEAN STANDARD NORME
6、EUROPENNE EUROPISCHE NORM EN 12123 November 2012 ICS 71.100.80 Supersedes EN 12123:2005English Version Chemicals used for treatment of water intended for human consumption - Ammonium sulfate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Sulfate dammonium Pro
7、dukte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Ammoniumsulfat 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). A
9、 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, Cypr
10、us, 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 Kin
11、gdom. 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 12123:2012: ECopyr
12、ight European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity cr
13、iteria 75 Test methods 86 Labelling Transportation Storage . 14Annex A (informative) General information on ammonium sulfate . 15Bibliography . 17Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without licen
14、se from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 3 Foreword This document (EN 12123:2012) 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 status of a national standard, either by publication of
15、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 subject of patent rights. CEN and/or CENELEC shall not be held
16、responsible for identifying any or all such patent rights. This document supersedes EN 12123:2005. Significant technical differences between this edition and EN 12123:2005 are as follows: Modification of 6.2 on labelling, deletion of the reference to EU Directive 80/778/EEC of 15 July 1980 in order
17、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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland,
18、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. Copyright European Committee for Stan
19、dardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by the product c
20、overed 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 adoption of verifiable European criteria, existing national regu
21、lations 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. The use of the product covered by this European Standard is
22、 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 12123:2012EN 12123:2012 (E) 5 1 Scope This European Standard is a
23、pplicable to ammonium sulfate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements of ammonium sulfate and refers to the corresponding analytical methods. It gives information on its use in water treatment. 2 Normative references
24、 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 ISO
25、 3696, Water for analytical laboratory use Specification and test methods (ISO 3696) ISO 760, Determination of water Karl Fischer method (General method) ISO 2992, Ammonium sulphate for industrial use Determination of iron content 2,2- bipyridyl photometric method ISO 2993, Ammonium sulphate for ind
26、ustrial use Determination of free acidity Titrimetric method ISO 3165, Sampling of chemical products for industrial use Safety in sampling ISO 3332, Ammonium sulphate for industrial use Determination of ammoniacal nitrogen content Titrimetric method after distillation ISO 5993, Sodium hydroxide for
27、industrial use Determination of mercury content Flameless atomic absorption spectrometric method ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 6353-1, Reagents for chemical analysis Part 1: General test methods ISO 8213, Chemical products for industrial use Sampling techniqu
28、es Solid chemical products in the form of particles varying from powders to coarse lumps 3 Description 3.1 Identification 3.1.1 Chemical name Ammonium sulfate. 3.1.2 Synonym or common name Ammonium sulfate. 3.1.3 Relative molecular mass 132,14. Copyright European Committee for Standardization Provid
29、ed by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 6 3.1.4 Empirical formula (NH4)2SO4.3.1.5 Chemical formula (NH4)2SO4.3.1.6 CAS-Registry Number 1)7783-20-2. 3.1.7 EINECS reference 2)213-984-1. 3.2 Com
30、mercial form The product is a powder. 3.3 Physical properties 3.3.1 Appearance The product is a white, fine crystalline powder. 3.3.2 Density The density of the product is 1,8 g/cm at 20 C. 3.3.3 Solubility in water The solubility of the product in water is 767 g/l at 25 C. 3.3.4 Vapour pressure Not
31、 applicable. 3.3.5 Boiling point at 100 kPa 3)Not applicable. 3.3.6 Crystallisation point The product decomposes above 235 C. 3.3.7 Specific heat Not known. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. Copyright
32、European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 7 3.3.8 Viscosity, dynamic Not applicable. 3.3.9 Critical temperature Not applicable. 3.3.10 Critical pres
33、sure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Ammonium sulfate easily dissolves in water. A saturated solution (706 g/l at 0 C) has a pH value of approximately 6. Upon heating with chlorates, nitrates or nitrites it reacts violently. Above 235 C the product de
34、composes with formation of ammonia vapour, sulfur oxides. 4 Purity criteria 4.1 General This document specifies the minimum purity requirements for ammonium sulfate used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depend
35、ing 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 tre
36、atment 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 prese
37、nt 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 The content
38、of ammonium sulfate shall not be less than a mass fraction of 99% corresponding to a mass fraction of 21 % of ammoniacal nitrogen. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Copyright European Committee for Standardization Provided by IHS
39、under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 8 Table 1 Impurities Impurity Limit in mg/kg of the product Sulfuric acid (free) H2SO4 max 200 Water max 300Iron (Fe) max 10 4.4 Chemical parameters The product
40、shall conform to the requirements specified in Table 2. Table 2 Chemical parameters Parameter Limit mg/kg of commercial product Antimony (Sb) max 1 Arsenic (As) max 5 Cadmium (Cd) max 0,5 Chromium (Cr) max 5 Lead (Pb) max 5 Mercury (Hg) max 0,1 Nickel (Ni) max 5 Selenium (Se) max 2 NOTE Pesticides a
41、nd polycyclic aromatic hydrocarbons and cyanides (CN-) are not relevant in ammonium sulfate because the raw materials used in the manufacturing are free of them. For parametric values of ammonium sulfate on trace metal content in drinking water, see 1. 5 Test methods 5.1 Sampling Observe the general
42、 recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213. 5.2 Analyses 5.2.1 Main product The content of ammoniacal nitrogen (C1), expressed as mass fraction in %, shall be determined in accordance with ISO 3
43、332 (titrimetric method after distillation). The content of ammonium sulfate (NH4)2SO4)(C2), expressed as mass fraction in %, is calculated from the formula: 72,412= CC (1) Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or network
44、ing permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 9 5.2.2 Impurities 5.2.2.1 Water The content of water (H2O) shall be determined in accordance with ISO 760 (Karl Fischer method). 5.2.2.2 Sulfuric acid The content of free sulfuric acid (H2SO4) shall be determined in accord
45、ance with ISO 2993. 5.2.2.3 Iron (Fe) The content of iron (Fe) shall be determined in accordance with ISO 2992. 5.2.3 Chemical parameters 5.2.3.1 General The content of chemical parameters shall be determined using the procedures specified in Table 3: Table 3 Procedures for the determination of chem
46、ical parameters Element Reference Method Wavelength (nm) Flame As see 5.2.3.3 Hydride AAS 193,7 n.a.Sb see 5.2.3.3 Hydride AAS 217,6 n.a. Cd ISO 6353-1 GM 29see 5.2.3.2 AAS 228,8 air-acetylene Cr ISO 6353-1 GM 29see 5.2.3.2 AAS 357,8 air-acetylene Pb ISO 6353-1 GM 29see 5.2.3.2 AAS 217,0 or 283,3 ai
47、r-acetylene Ni ISO 6353-1 GM 29see 5.2.3.2 AAS 232,0 oxidising acetylene-air Se see 5.2.3.3 Hydride AAS 196,0 n.a.Hg in accordance withISO 5993 flameless AAS 253,6 n.a. AAS = Atomic Absorption Spectroscopy. n.a. = not applicable. Copyright European Committee for Standardization Provided by IHS under
48、 license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 12123:2012EN 12123:2012 (E) 10 5.2.3.2 Determination of cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) 5.2.3.2.1 Principle The elements cadmium (Cd), chromium (Cr), lead (Pb) and nickel (Ni) are determined using atomic absorption spectrometry with the standard additions technique. 5.2.3.2.2 Reagents All reagents shall be of a recognised analytical grade an
