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

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

General information on ammonium sulfate.17 Bibliography.19
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

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.
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

fraction in % , is calculated from the equation: 72,412×=CC (1) 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 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 determined using the procedures specified in Table 3:
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 air-acetylene Ni ISO 6353-1 GM 29see 5.2.3.2 AAS 232,0 oxidizing 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 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 recognized 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 µg/l Cd, Cr, Pb or Ni) The standard solution shall be freshly prepared on the day of use by 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 of tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE) or polyethylene (PE). NOTE The stock solution should not be kept for longer than four weeks. 5.2.3.2.3
Apparatus Ordinary laboratory apparatus and the following: SIST EN 12123:2005
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