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 AmmoniumsulfateBS EN 12123:2012 BRITISH STANDARDNational forewordThis British Standard is the U
2、K implementation of EN 12123:2012. Itsupersedes BS EN 12123:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can beobtained on request to its secret
3、ary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. 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
4、 cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationDate Text affectedBS EN 12123:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12123 Novem
5、ber 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 Produkte zur Aufbereitung von Wasser fr den
6、 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 national standard without any alteration
7、. 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 version in any other language made by t
8、ranslation 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, Cyprus, Czech Republic, Denmark, Estonia, Fi
9、nland, 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 Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZA
10、TION 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: EBS EN 12123:2012EN 12123:2012 (E) 2 Contents
11、Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity criteria 75 Test methods 86 Labelling Transportation Storage . 14Annex A (informative) General information on ammonium sulfate . 15Bibliography . 17BS EN 12123:2012EN 12123:2012 (E) 3 Foreword This document (EN 1
12、2123:2012) 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 an identical text or by endorsement, at the latest by May 2013, and conflicting
13、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 responsible for identifying any or all such patent rights. This document superse
14、des 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 to take account of the latest Directive in force. According to the CEN/CENELEC I
15、nternal 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland
16、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12123:2012EN 12123:2012 (E) 4 Introduction In respect of potential adverse effects on the quality of water inte
17、nded 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 adoption of ve
18、rifiable 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. The use o
19、f the product covered by this European Standard is subject to regulation or control by National Authorities. BS EN 12123:2012EN 12123:2012 (E) 5 1 Scope This European Standard is applicable to ammonium sulfate used for treatment of water intended for human consumption. It describes the characteristi
20、cs 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 The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its
21、 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 3696, Water for analytical laboratory use Specification and test methods (ISO 3696) ISO 760, Determination of water Kar
22、l 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 industrial use Determination of free acidity Titrimetric method ISO 3165, Sampling of chemical products for industrial use
23、Safety in sampling ISO 3332, Ammonium sulphate for industrial use Determination of ammoniacal nitrogen content Titrimetric method after distillation ISO 5993, Sodium hydroxide for industrial use Determination of mercury content Flameless atomic absorption spectrometric method ISO 6206, Chemical prod
24、ucts 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 techniques Solid chemical products in the form of particles varying from powders to coarse lumps 3 Description 3.1 Identificatio
25、n 3.1.1 Chemical name Ammonium sulfate. 3.1.2 Synonym or common name Ammonium sulfate. 3.1.3 Relative molecular mass 132,14. 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-
26、1. 3.2 Commercial 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 pr
27、essure Not 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.
28、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 pressure 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
29、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 decomposes with formation of ammonia vapour, sulfur oxides. 4 Purity criteria 4.1 General This document specifies the minimum purity requirements for ammonium sul
30、fate used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product. Depending 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 relev
31、ant authorities. Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the p
32、roduct not stated in this product standard. Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw materials leads to significant quantities o
33、f impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product The content 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-pr
34、oducts The product shall conform to the requirements specified in Table 1. 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 shall conform to the requireme
35、nts 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 and polycyclic aromatic hydroca
36、rbons 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 recommendations of ISO 3165 a
37、nd 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 3332 (titrimetric method after
38、distillation). The content of ammonium sulfate (NH4)2SO4)(C2), expressed as mass fraction in %, is calculated from the formula: 72,412= CC (1) 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 me
39、thod). 5.2.2.2 Sulfuric acid The content of free sulfuric acid (H2SO4) shall be determined in accordance 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 de
40、termined using the procedures specified in Table 3: Table 3 Procedures for the determination of chemical 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
41、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 air-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 Spectro
42、scopy. n.a. = not applicable. 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 stan
43、dard additions technique. 5.2.3.2.2 Reagents All reagents shall be of a recognised analytical grade and the water used shall conform to the grade 3 specified in EN ISO 3696. 5.2.3.2.2.1 Standard solution (100 g/l Cd, Cr, Pb or Ni) The standard solution shall be freshly prepared on the day of use by
44、individual dilution of a stock solution. This stock solution with a Cd, Cr, Pb or Ni content of at least 1 mg/l shall be made by dilution of standard solutions of Cd, Cr, Pb and Ni which are available from all major suppliers of laboratory chemicals. This stock solution shall be kept in containers o
45、f tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE) or polyethylene (PE). The stock solution should not be kept for longer than four weeks. 5.2.3.2.3 Apparatus Ordinary laboratory apparatus and the following: 5.2.3.2.3.1 Atomic absorption spectrometer with the m
46、easurement parameters specified in Table 3. 5.2.3.2.4 Procedure 5.2.3.2.4.1 Test portion Weigh 1 g (m) to the nearest 0,01 mg of the laboratory sample into a 100 ml one-mark volumetric flask and make up to the mark at 20 C with water. 5.2.3.2.4.2 Determination The reference solutions shall be made b
47、y spiking the sample with the standard solutions, which contain stepwise increasing contents of the elements to be determined. NOTE The amount of internal standard to be added can be estimated from a preliminary investigation, determining roughly the element content of the test sample from simple ca
48、libration. The steps in which internal standards have to be added shall be at least as high as the estimated content of the test sample. With the spectrometer (5.2.3.2.3.1), carry out the measurement with the parameters specified in Table 3 in accordance with the manufacturers instructions. Repeat t
49、he procedure with all reagents and the same volume of standard solution to be added using water in place of the sample as a blank determination. 5.2.3.2.5 Expression of results Prepare a calibration curve using the measured absorbencies of the spiked measurement solutions. BS EN 12123:2012EN 12123:2012 (E) 11 Read the concentration of each element in the test solution by extrapolation of the correlation line to absorbance A = 0 (see Figure 1). Similarly determine the element concentr
