1、BRITISH STANDARD BS EN 889:2004 Chemicals used for treatment of water intended for human consumption Iron (II) sulfate The European Standard EN 889:2004 has the status of a British Standard ICS 71.100.80 BS EN 889:2004 This British Standard was published under the authority of the Standards Policy a
2、nd Strategy Committee on 2 December 2004 BSI 2 December 2004 ISBN 0 580 44949 1 National foreword This British Standard is the official English language version of EN 889:2004. It supersedes BS EN 889:1999 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committ
3、ee CII/59, Chemicals for drinking water treatment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this doc
4、ument may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract
5、. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for c
6、hange, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 32, an inside back cover and a back cover. The BSI copyright
7、notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 889 November 2004 ICS 71.100.80 Supersedes EN 889:1998 English version Chemicals used for treatment of water
8、intended for human consumption - Iron (II) sulfate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Sulfate de fer (II) Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Eisen (II) sulfat This European Standard was approved by CEN on 30 Septem
9、ber 2004. 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 obt
10、ained 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 Sec
11、retariat 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, P
12、ortugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means res
13、erved worldwide for CEN national Members. Ref. No. EN 889:2004: EEN 889:2004 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Description .5 4 Purity criteria7 5 Test methods9 6 Labelling - Transportation - Storage11 Annex A (informative) General information on iron
14、 (ll) sulfate.12 Annex B (normative) Analytical methods .17 Annex C (informative) Determination of cadmium, chromium, nickel and lead (inductively coupled plasma optical emission spectrometry (ICP/OES)30 Bibliography 32 EN 889:2004 (E) 3 Foreword This document (EN 889:2004) has been prepared by Tech
15、nical 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 2005, and conflicting national standards shall be withdraw
16、n at the latest by May 2005. This document supersedes EN 889:1998. Significant technical differences between this edition and EN 889:1998 are as follows: a) replacement of the reference of to EU Directive 80/778 of 15 July 1980 with the latest Directive in force (see1); b) expansion of annex A by ad
17、dition of A.2 “quality of commercial product“; c) deletion of annex D. 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
18、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 889:2004 (E) 4 Introduction In respect of potential adverse effects on the quality of water
19、intended for human consumption, caused by the product covered by this Standard: a) this 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 Euro
20、pean criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. NOTE Conformity with the 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 b
21、y this document is subject to regulation or control by National Authorities. EN 889:2004 (E) 5 1 Scope This document is applicable to iron (II) sulfate heptahydrate used for treatment of water intended for human consumption. It describes the characteristics of iron (II) sulfate heptahydrate and spec
22、ifies the requirements and the corresponding analytical methods for iron (II) sulfate heptahydrate (analytical methods are given in Annex B) and gives information on its use in water treatment. 2 Normative references The following referenced documents are indispensable for the application of this do
23、cument. 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 3696:1987). ISO 3165, Sampling of chemical pr
24、oducts for industrial use - Safety in sampling. ISO 6206, Chemical products for industrial use - Sampling - Vocabulary. 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 Iden
25、tification 3.1.1 Chemical name Iron (II) sulfate heptahydrate. 3.1.2 Synonym or common names Ferrous sulfate, iron vitriol, copperas, green salt. 3.1.3 Relative molecular mass 278,02. 3.1.4 Empirical formula FeSO 4 . 7H 2 O. 3.1.5 Chemical formula FeSO 4 . 7H 2 O. EN 889:2004 (E) 6 3.1.6 CAS Registr
26、y Number 1)7782-63-0 (FeSO 4. 7H 2 O). 7720-78-7 (FeSO 4 ). 3.1.7 EINECS reference 2)231-753-5 (FeSO 4 ). 3.2 Commercial forms The iron (ll) sulfate heptahydrate is available as wet crystals (a) or free-flowing crystals (b). 3.3 Physical properties 3.3.1 Appearance The iron (ll) sulfate heptahydrate
27、 is a light green crystal. 3.3.2 Density The density of iron (ll) sulfate heptahydrate is equal to 1,9 g/cm 3at 20 C. The bulk density of commercial form a) is equal approximately to 1 kg/dm 3and of commercial form b) approximately to 0,8 kg/dm 3 . 3.3.3 Solubility (in water) The solubility of iron
28、(II) sulfate heptahydrate is 487 g/l at 20 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa 3)Not applicable. 3.3.6 Melting point For the iron (ll) sulfate heptahydrate the melting starts at approximately 64 C, leading to decomposition. 3.3.7 Specific heat Not known. 3.3.8 Vis
29、cosity (dynamic) Not applicable. 1)Chemical Abstracts Service Registry Number. 2)European Inventory of Existing Commercial Chemical Substances. 3)100 kPa = 1 bar. EN 889:2004 (E) 7 3.3.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applic
30、able. 3.4 Chemical properties Iron (II) sulfate heptahydrate and especially solutions of iron (II) sulfate heptahydrate have acid and reducing properties. They react by oxidation or hydrolysis (depending on the pH). 4 Purity criteria 4.1 General This document specifies the minimum purity requirement
31、s for iron (II) 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
32、 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
33、 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
34、significant quantities of impurities, by-products, or additives being present, this shall be notified to the user. 4.2 Composition of commercial product The product shall contain not less than a mass fraction of 82,1 % of FeSO 4. 7H 2 O (i.e. not less than a mass fraction of 16 % of Fe) and shall be
35、 within 3 % of the manufacturers declared values. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. The concentration limits refer to Fe (ll). EN 889:2004 (E) 8 Table 1 Impurities Limit Mass fraction of Fe (ll) content in % Impurity Grade 1 Grade
36、 2 Grade 3 Manganese max. 0,5 1 2 Insoluble matters : - wet crystal form (a) max. 0,6 0,6 0,6 - free flowing form (b) max. 3 3 3 NOTE An excess of insoluble matters indicates the presence of foreign matter. Iron as a component of the product will usually be removed in the treatment process. 4.4 Chem
37、ical parameters The product shall conform to the requirements specified in Table 2. The concentration limits are specified in milligrams per kilogram of Fe (II). Table 2 Chemical parameters Limit in mg/kg of Fe (II) Parameter type 1 type 2 type 3 Arsenic (As) max. 1 20 50 Cadmium (Cd) max. 1 25 50 C
38、hromium (Cr) max. 100 350 500 Mercury (Hg) max. 0,1 5 10 Nickel (Ni) max. 300 350 500 Lead (Pb) max. 10 100 400 Antimony (Sb) max. 10 20 60 Selenium (Se) max. 1 20 60 NOTE Cyanide (CN - ),pesticides and polycyclic aromatic hydrocarbons are not relevant since the raw materials used in the manufacturi
39、ng process are free of them. For maximum impact of iron (ll) sulfate on trace metal content in drinking water see A.2. EN 889:2004 (E) 9 5 Test methods 5.1 Sampling Observe the general recommendations of ISO 3165 and take into account ISO 6206. Prepare the laboratory sample required by the relevant
40、procedure described in ISO 8213. 5.2 Analyses 5.2.1 Main product Iron (II) sulfate is determined as Fe (II) content in the test sample by titrimetry with potassium dichromate solution (see B.1). 5.2.2 Impurities 5.2.2.1 Manganese The manganese content shall be determined by flame atomic absorption s
41、pectrometry (FAAS) (see B.2). 5.2.2.2 Insoluble matters The percentage mass fraction of the insoluble matters shall be determined in accordance with the method described in B.3. 5.2.3 Chemical parameters 5.2.3.1 General The contents of chemical parameters shall be determined by atomic absorption spe
42、ctrometry (AAS). 5.2.3.2 Preparation of sample solution 5.2.3.2.1 General Oxidation and wet digestion is used to bring the samples into a stable solution. 5.2.3.2.2 Principle Oxidation with hydrogen peroxide (H 2 O 2 )followed by digestion with hydrochloric acid (HCl). 5.2.3.2.3 Reagents All reagent
43、s shall be of a recognized analytical grade and the water used shall conform to the grade 3 specified in EN ISO 3696. 5.2.3.2.3.1 Hydrochloric acid (HCl), solution, mass fraction 30 %. 5.2.3.2.3.2 Hydrogen peroxide (H 2 O 2 ), solution, mass fraction 30 %. EN 889:2004 (E) 10 5.2.3.2.4 Apparatus Ordi
44、nary laboratory apparatus and glassware together with the following 5.2.3.2.4.1 Analytical balance. 5.2.3.2.4.2 Graduated cylinder, capacity 50 ml. 5.2.3.2.4.3 Round flask with reflux condenser. 5.2.3.2.4.4 Hot plate. 5.2.3.2.4.5 Volumetric flask, capacity 200 ml. 5.2.3.2.5 Procedure Dissolve with 2
45、0 ml of water 20,0 g of the iron salt. Add to iron (II)-samples 30 ml hydrogen peroxide solution (5.2.3.2.3.2). After adding 50 ml hydrochloric acid (5.2.3.2.3.1) boil the solution for 15 min by using a reflux condenser (5.2.3.2.4.3). Cool down the solution, transfer to a 200 ml volumetric flask (5.
46、2.3.2.4.5) and fill up to the mark with water. This is the sample solution. 5.2.3.3 Arsenic The arsenic content shall be determined by hydride generation atomic absorption spectrometry (see B.4). 5.2.3.4 Cadmium The cadmium content shall be determined by graphite furnace atomic absorption spectromet
47、ry (see B.6). 5.2.3.5 Chromium The chromium content shall be determined by graphite furnace atomic absorption spectrometry (see B.6). 5.2.3.6 Mercury The mercury content shall be determined by cold vapour atomic absorption spectrometry (see B.5). 5.2.3.7 Nickel The nickel content shall be determined
48、 by graphite furnace atomic absorption spectrometry (see B.6). 5.2.3.8 Lead The lead content shall be determined by graphite furnace atomic absorption spectrometry (see B.6). 5.2.3.9 Antimony The antimony content shall be determined by hydride generation atomic absorption spectrometry (see B.4). 5.2
49、.3.10 Selenium The selenium content shall be determined by hydride generation atomic absorption spectrometry (see B.4). EN 889:2004 (E) 11 6 Labelling - Transportation - Storage 6.1 Means of delivery 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 Risk and safety labelling according to the EU Directives 4)Iron (II) sulfate is no
