1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1421:2012Chemicals used for treatmentof water intended for humanconsumption AmmoniumchlorideBS EN 1421:2012 BRITISH STANDARDNational forewordThis British Standard is the UK
2、 implementation of EN 1421:2012. It supersedes BS EN 1421:2005 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can be obtained on request to its secret
3、ary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013ISBN 978 0 580 77778 3 ICS 13.060.20; 71.100.80 Compliance with a British Sta
4、ndard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2013.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 1421:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NO
5、RM EN 1421 November 2012 ICS 71.100.80 Supersedes EN 1421:2005English Version Chemicals used for treatment of water intended for human consumption - Ammonium chloride Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Chlorure dammonium Produkte zur Aufbereitung
6、von Wasser fr den menschlichen Gebrauch - Ammoniumchlorid 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 with
7、out 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 version in any other
8、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, Cyprus, Czech Republic, De
9、nmark, 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 Kingdom. EUROPEAN COMMITT
10、EE 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 1421:2012: EBS EN 1421:2012EN 1421:2012
11、(E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 53 Description .54 Purity criteria 75 Test methods 96 Labelling Transportation Storage . 10Annex A (informative) General information on ammonium chloride 12Annex B (normative) General rules relating to safety 13Bibliography
12、 . 14BS EN 1421:2012EN 1421:2012 (E) 3 Foreword This document (EN 1421:2012) 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 t
13、ext 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 responsible fo
14、r identifying any or all such patent rights. This document supersedes EN 1421:2005. The significant technical differences between this edition and EN 1421:2005 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 acco
15、unt 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, Former Yugos
16、lav 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. BS EN 1421:2012EN 1421:2012 (E) 4 Introduction In
17、 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 E
18、FTA; 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 th
19、e 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. BS EN 1421:2012EN 1421:2012 (E) 5 1 Scope This European Standard is applicable to ammonium chloride used for treatment of wat
20、er intended for human consumption. It describes the characteristics and specifies the requirements of ammonium chloride and refers to the corresponding analytical methods. It gives information for its use in water treatment. It also determines the rules relating to safe handling and use of ammonium
21、chloride (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. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced docum
22、ent (including any amendments) applies. EN 1233, Water quality Determination of chromium Atomic absorption spectrometric methods EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696) EN ISO 11885, Water quality Determination of selected elements by inductively co
23、upled plasma optical emission spectrometry (ICP-OES) (ISO 11885) EN ISO 11969, Water quality Determination of arsenic Atomic absorption spectrometric method (hydride technique (ISO 11969) EN ISO 12846, Water quality Determination of mercury Method using atomic absorption spectrometry (AAS) with and
24、without enrichment (ISO 12846) ISO 2762,Hydrochloric acid for industrial use Determination of soluble sulfates Turbidimetric method ISO 3165, Sampling of chemical products for industrial use Safety in sampling ISO 3332, Ammonium sulphate for industrial use Determination of ammoniacal nitrogen conten
25、t Titrimetric method after distillation ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 6332, Water quality Determination of iron Spectrometric method using 1,10-phenanthroline ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the fo
26、rm of particles varying from powders to coarse lumps ISO 8288:1986, Water quality Determination of cobalt, nickel, copper, zinc, cadmium and lead Flame atomic absorption spectrometric methods ISO 9965, Water quality Determination of selenium Atomic absorption spectrometric method (hydride technique)
27、 3 Description 3.1 Identification 3.1.1 Chemical name Ammonium chloride. BS EN 1421:2012EN 1421:2012 (E) 6 3.1.2 Synonym or common name Sal-ammoniac. 3.1.3 Relative molecular mass 53,5. 3.1.4 Empirical formula NH4Cl. 3.1.5 Chemical formula NH4Cl. 3.1.6 CAS Registry Number 1)12125-02-9. 3.1.7 EINECS
28、reference 2)235-186-4. 3.2 Commercial form Ammonium chloride is available as a powder. 3.3 Physical properties 3.3.1 Appearance and odour The product is a white powder or white crystals, without any odour. 3.3.2 Density The density of the product is 1,53 g/cm3at 20 C. The bulk density is 0,6 g/cm3to
29、 1 g/cm3depending on particle size. 3.3.3 Solubility in water The solubility of the product in water at 20 C is 374 g/l. The solubility of the product in water at 50 C is 504 g/l. NOTE Dissolution of NH4Cl in water is a strongly endothermic reaction and the resulting decrease in temperature can lead
30、 to crystallisation. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. BS EN 1421:2012EN 1421:2012 (E) 7 3.3.4 Vapour pressure 100 Pa at 160 C. 3.3.5 Boiling point at 100 kPa 3) Not applicable. 3.3.6 Melting point Sublimation at 338 C. 3
31、.3.7 Specific heat Not known. 3.3.8 Viscosity 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 The pH value of an aqueous solution of mass fraction of 5 % is 4 to 6. Ammonium chloride
32、attacks metals, e.g. iron, copper, nickel, zinc. Reaction with strong acids can generate hydrochloric acid gas; reaction with strong alkalis can generate ammonia gas. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for ammonium chloride used for the tre
33、atment 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. 3)
34、100 kPa = 1 bar. BS EN 1421:2012EN 1421:2012 (E) 8 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 impu
35、rities 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
36、 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 chloride (NH4Cl) shall not be less than a mass fraction of 99 %. 4.3 Impurities and main by-products The product s
37、hall conform to the requirements specified in Table 1. Table 1 Impurities Impurity Limit (mg/kg) of the product Sulfate (SO42-) max 100 Iron (Fe) max 5 4.4 Chemical parameters The product shall conform to the requirements specified in Table 2. Table 2 Chemical parameters Parameter Limit (mg/kg) of t
38、he 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 1 NOTE Pesticides and polycyclic aromatic hydrocarbons and cyanides (CN) are not relevant in ammonium chloride because the raw materials
39、 used in the manufacturing process are free of them. For parametric values of ammonium chloride on trace metal content in drinking water, see 1. BS EN 1421:2012EN 1421:2012 (E) 9 5 Test methods 5.1 Sampling Observe the general recommendations of ISO 3165 and take account of ISO 6206. Prepare the lab
40、oratory sample(s) required by the relevant procedure described in ISO 8213. 5.2 Analyses 5.2.1 Main product The determination of the ammoniacal nitrogen by titration after distillation is carried out in accordance with ISO 3332. 5.2.2 Impurities 5.2.2.1 Iron (Fe) The iron content shall be determined
41、 in accordance with ISO 6332. 5.2.2.2 Sulfate The sulfate (SO42-) content shall be determined in accordance with ISO 2762. 5.2.3 Chemical parameters 5.2.3.1 Determination of antimony (Sb), arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), mercury (Hg), nickel (Ni) and selenium (Se) 5.2.3.1.1 Pri
42、nciple The elements antimony, arsenic, cadmium, chromium, lead, mercury, nickel and selenium are determined by atomic absorption spectrometry. 5.2.3.1.2 Reagents All reagents shall be of a recognised analytical grade and the water used shall conform to grade 3 specified in EN ISO 3696. 5.2.3.1.2.1 H
43、ydrochloric acid, concentrated density = 1,18 g/ml. 5.2.3.1.3 Procedure 5.2.3.1.3.1 Test portion Weigh, to the nearest 0,001 g, 2,5 g (m) from the laboratory sample into a 100 ml one-mark volumetric flask. 5.2.3.1.3.2 Test solution Add 20 ml of water and 2 ml of the hydrochloric acid (5.2.3.1.2.1),
44、dissolve and make up to the mark with water and mix. BS EN 1421:2012EN 1421:2012 (E) 10 5.2.3.1.3.3 Determination Determine the content of chemical parameters in the test solution (5.2.3.1.3.2) in accordance with the following methods: Ni, Pb and Cd: in accordance with ISO 8288:1986, method A; Cr: i
45、n accordance with EN 1233; As: in accordance with EN ISO 11969; Se: in accordance with ISO 9965; Sb: in accordance with EN ISO 11885; Hg: in accordance with EN ISO 12846. These methods are providing an interim result (y) expressed in milligrams per litre which needs to be converted to give the final
46、 concentration according to the formula in 5.2.3.1.3.4. 5.2.3.1.3.4 Expression of results From the interim result (y) determined (see 5.2.3.1.3.3), the content, C, of each chemical parameter in the laboratory sample, expressed in milligrams per kilogram of ammonium chloride is given by the following
47、 formula. mVyC100= (1) where y is the interim result (5.2.3.1.3.3); V is the volume, expressed in millilitres, of the test solution (5.2.3.1.3.2) (= 100 ml); m is the mass, expressed in grams, of the test portion. 6 Labelling Transportation Storage 6.1 Means of delivery Ammonium chloride shall be de
48、livered in paper bags with polyethylene liners, polyethylene or polypropylene bags. In order that the purity of the product is not affected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use. 6.2 Labell
49、ing according to the EU legislation 4)The following labelling requirements apply to ammonium chloride at the date of publication of this European Standard: 4) See 2. BS EN 1421:2012EN 1421:2012 (E) 11 Hazard pictogram GHS07 Signal word: Warning Hazard statements: H302: Harmful if swallowed H319: Causes serious eye irritation Precautionary statements (P statements) should be provided by the company being responsible for the marketing of the substance.
