SIST EN 12123:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - Amonijev sulfatProdukt zur Aufbereitung von Wasser für den menschlichen Gebrauch - AmmoniumsulfatProduits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Sulfate d'ammoniumChemicals used for treatment of water intended for human consumption - Ammonium sulfate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12123:2005SIST EN 12123:2005en01-september-2005SIST EN 12123:2005SLOVENSKI
STANDARDSIST EN 12123:20001DGRPHãþD



SIST EN 12123:2005



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12123
June 2005 ICS 71.100.80
Supersedes EN 12123:1998
English version
Chemicals used for treatment of water intended for human consumption - Ammonium sulfate
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Sulfate d'ammonium
Produkt zur Aufbereitung von Wasser für den menschlichen Gebrauch - Ammoniumsulfat This European Standard was approved by CEN on 12 May 2005.
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 lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12123:2005: ESIST EN 12123:2005



EN 12123:2005 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Description.5 4 Purity criteria.7 Table 1 - Impurities.9 Table 2 – Chemical parameters.9 5 Test methods.9 Table 3 - Procedures for the determination of chemical parameters.11 Figure 1 — Calculation of the element concentration in the test solution.13 Figure 2 – Calculation of the element concentration in the blank solution.14 Table 4 — Standard solution.15 6 Labelling – Transportation – Storage.16 Annex A (informative)
General information on ammonium sulfate.17 Bibliography.19
SIST EN 12123:2005



EN 12123:2005 (E) 3 Foreword This European Standard (EN 12123:2005) 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 December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005. This document supersedes EN 12123:1998. Significant technical differences between this edition and EN 12123:1998 are as follows:  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(see [1]). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 12123:2005



EN 12123:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of 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 adoption 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. The use of the product covered by this European Standard is subject to regulation or control by National Authorities.
SIST EN 12123:2005



EN 12123:2005 (E) 5 1 Scope This European Standard is applicable 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 The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987) ISO 760, Determination of water - Karl Fischer method (General method) ISO 2992, Ammonium sulfate for industrial use - Determination of iron content - 2,2'- bipyridyl photometric method ISO 2993, Ammonium sulfate for industrial use - Determination of free acidity - Titrimetric method ISO 3165, Sampling of chemical products for industrial use – Safety in sampling ISO 3332, Ammonium sulfate 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 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 techniques – 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. SIST EN 12123:2005



EN 12123:2005 (E) 6
3.1.4 Empirical formula (NH4)2SO4. 3.1.5 Chemical formula (NH4)2SO4. 3.1.6 CAS-Registry Number1)
7783-20-2. 3.1.7 EINECS reference2)
213-984-1. 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/cm³ 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 applicable. 3.3.5 Boiling point at 100 kPa3)
Not applicable. 3.3.6 Crystallisation point The product decomposes above 235 °C.
1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SIST EN 12123:2005



EN 12123:2005 (E) 7
3.3.7 Specific heat Not known. 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 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 sulfate 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 relevant authorities. NOTE 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 product 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 of 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.
SIST EN 12123:2005



EN 12123:2005 (E) 8 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. SIST EN 12123:2005



EN 12123:2005 (E) 9 Table 1 - Impurities Impurity Limit in mg/kg of the product Sulfuric acid (free) H2SO4 max. 200 Water max. 300 Iron (Fe) max. 10
4.4 Chemical parameters The product 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 and 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 recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213. SIST EN 12123:2005



EN 12123:2005 (E) 10 5.2 Analyses 5.2.1 Main product The content of ammoniacal nitrogen (C1), expressed as mass fraction in %, shall be determin
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