1、BRITISH STANDARD BS EN 891:2004 Chemicals used for treatment of water intended for human consumption Iron (III) chloride sulfate The European Standard EN 891:2004 has the status of a British Standard ICS 71.100.80 BS EN 891:2004 This British Standard was published under the authority of the Standard
2、s Policy and Strategy Committee on 2 December 2004 BSI 2 December 2004 ISBN 0 580 44951 3 National foreword This British Standard is the official English language version of EN 891:2004. It supersedes BS EN 891:1999, which is withdrawn. The UK participation in its preparation was entrusted to Techni
3、cal Committee 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
4、in this document 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
5、 a contract. 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 prop
6、osals for change, 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 37 and a back cover. The BSI copyright notice disp
7、layed 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 891 November 2004 ICS 71.100.80 Supersedes EN 891:1998 English version Chemicals used for treatment of water intended fo
8、r human consumption - Iron (III) chloride sulfate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Chlorosulfate de fer (III) Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Eisen (III) chloridsulfat This European Standard was approved by CE
9、N on 30 September 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 standa
10、rds 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 t
11、he 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, Nor
12、way, Poland, Portugal, 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
13、 any means reserved worldwide for CEN national Members. Ref. No. EN 891:2004: EEN 891:2004 (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 - Storage12 Annex A (informative) General infor
14、mation on iron (III) chloride sulfate.14 Annex B (normative) Analytical methods .18 Annex C (informative) Reduction of Fe (III) on a silver column33 Annex D (informative) Determination of cadmium, chromium, nickel and lead (inductively coupled plasma optical emission spectrometry (ICP/OES)34 Annex E
15、 (normative) General rules relating to safety36 Bibliography 37 EN 891:2004 (E) 3 Foreword This document (EN 891:2004) 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 standar
16、d, either by publication of an identical text or by endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 891:1998. Significant technical differences between this edition and EN 891:1998 are as follows: a)
17、 replacement of the reference to EU Directive 80/778/ of 15 July 1980 with the latest Directive in force (see1) ; b) expansion of annex A by addition of A.2 “Quality of commercial product“ ; c) deletion of annex F. According to the CEN/CENELEC Internal Regulations, the national standards organizatio
18、ns 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
19、, Spain, Sweden, Switzerland and United Kingdom. EN 891:2004 (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 document: a) this document provides no information as to whether the product may be us
20、ed 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 stand
21、ard 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 document is subject to regulation or control by National Authorities. EN 891:2004 (E) 5 1 Scope This document is applicable to iron (III) chloride
22、sulfate used for treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate and specifies the requirements and the corresponding analytical methods for iron (III) chloride sulfate (analytical methods are given in Annex B) and gives information on its us
23、e in water treatment. It also determines the rules relating to safe handling and use of iron (III) chloride sulfate (see annex E). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. F
24、or 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 products for industrial use - Safety in sampling. ISO 5790:1979,
25、Inorganic chemical products for industrial use - General method for determination of chloride content - Mercurimetric method. ISO 6206, Chemical products for industrial use - Sampling Vocabulary. 3 Description 3.1 Identification 3.1.1 Chemical name Iron (III) chloride sulfate. 3.1.2 Synonym or commo
26、n names Ferric chloride sulfate, ferric chloro sulfate, chlorinated copperas. 3.1.3 Relative molecular mass 187,36. 3.1.4 Empirical formula FeClSO 4 . 3.1.5 Chemical formula FeClSO 4 . EN 891:2004 (E) 6 3.1.6 CAS Registry Number 1)12410-14-9. 3.1.7 EINECS reference 2)235-649-0. 3.2 Commercial form I
27、ron (III) chloride sulfate is available as solution. 3.3 Physical properties 3.3.1 Appearance Iron (III) chloride sulfate is a dark brown solution. 3.3.2 Density The density of iron (III) chloride sulfate is approximately 1,5 g/ml. 3.3.3 Solubility (in water) Iron (III) chloride sulfate is miscible
28、in water. NOTE Diluted solutions can hydrolyse and form a precipitate (see A.3.2). 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa 3)102 C. 3.3.6 Freezing point For the iron (III) chloride sulfate the freezing starts at approximately - 50 C. Below 15 C, sharp increase in viscosi
29、ty. 3.3.7 Specific heat Not known. 3.3.8 Viscosity (dynamic) For the iron (III) chloride sulfate the viscosity is approximately 70 mPa.s at 10 C. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. EN 891:2004 (E) 7 3.3
30、.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties The solutions of iron (III) chloride sulfate are acidic and highly corrosive. 4 Purity criteria 4.1 General This document specifies the minimum purity req
31、uirements for iron (III) chloride 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
32、 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 ot
33、her 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 m
34、aterials lead 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 product shall contain not less than a mass fraction of 36,9 % of FeClSO 4(i.e. not less than a mass fraction of 11 % of Fe) an
35、d shall be 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 (III). EN 891:2004 (E) 8 Table 1 Impurities Impurity Limit Mass fraction of Fe (III) content in % G
36、rade 1 Grade 2 Grade 3 Manganese max. 0,5 1 2 Iron(II) amax. 2,5 2,5 2,5 Insoluble matters bmax. 0,2 0,2 0,2 aFe (II) has a lower coagulant efficiency compared to Fe (III). Also hydrolysis of Fe (II) starts at pH value 8, and therefore Fe (II) can remain into the water at lower pH values. bAn excess
37、 of insoluble matters indicates the presence of foreign matter. Iron is a component of the product will usually be removed in the treatment process. 4.4 Chemical parameters The product shall conform to the requirements specified in Table 2. The concentration limits are specified in milligrams per ki
38、logram of Fe (III). Table 2 Chemical parameters Parameter Limit in mg/kg of Fe (III) Type 1 Type 2 Type 3 Arsenic (As) max. 1 20 50 Cadmium (Cd) max. 1 25 50 Chromium (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 S
39、elenium (Se) max. 1 20 60 NOTE Cyanide (CN - ), pesticides and polycyclic aromatic hydrocarbons are not relevant since the raw materials used in the manufacturing process are free of them. For maximum impact of iron (III) chloride sulfate on trace metal content in drinking water see A.2. EN 891:2004
40、 (E) 9 5 Test methods 5.1 Sampling 5.1.1 General Observe the general recommendations in ISO 3165 and take into account ISO 6206. Prepare the laboratory sample required by the relevant procedure described in 5.1.2 and 5.1.3. 5.1.2 Sampling from drums and bottles 5.1.2.1 General 5.1.2.1.1 Mix the cont
41、ents of each container to be sampled by shaking the container, by rolling it or by rocking it from side to side, taking care not to damage the container or spill any of the liquid. 5.1.2.1.2 If the design of the container is such (for example, a narrow-necked bottle) that it is impracticable to use
42、a sampling implement, take a sample by pouring after the contents have been thoroughly mixed. Otherwise, proceed as described in 5.1.2.3. 5.1.2.1.3 Examine the surface of the liquid. If there are signs of surface contamination, take samples from the surface as described in 5.1.2.2. Otherwise, take s
43、amples as described in 5.1.2.3. 5.1.2.2 Surface sampling Take a sample using a suitable ladle. Lower the ladle into the liquid until the rim is just below the surface, so that the surface layer runs into it. Withdraw the ladle just before it fills completely and allow any liquid adhering to the ladl
44、e to drain off. If necessary, repeat this operation so that, when the other selected containers have been sampled in a similar manner, the total volume of sample required for subsequent analysis is obtained. 5.1.2.3 Bottom sampling Take a sample using an open sampling tube, or a bottom-valve samplin
45、g tube, suited to the size of container and the viscosity of the liquid. When using an open sampling tube, close it at the top and then lower the bottom end to the bottom of the container. Open the tube and move it rapidly so that the bottom of the tube traverses the bottom of the container before t
46、he tube is filled. Close the tube, withdraw it from the container and allow any liquid adhering at the outside of the tube to drain off. When using a bottom-valve sampling tube, close the valve before lowering the tube into the container and then proceed in a similar manner to that when using an ope
47、n sampling tube. 5.1.3 Sampling from tanks and tankers From each access point, take samples as follows: a) from the surface of the liquid, using a ladle as described in 5.1.2.2 ; b) from the bottom of the tank or tanker, using a sampling tube as described in 5.1.2.3 or using specially designed botto
48、m-sampling apparatus ; c) from one or more positions, depending on the overall depth, between the bottom and the surface using a weighted sampling can. EN 891:2004 (E) 10 5.2 Analyses 5.2.1 Main product Iron (III) chloride sulfate is determined as Fe (III) content in the test sample. Fe (III) conten
49、t is determined as the difference between total iron content and Fe (II) content (see B.1). 5.2.2 Impurities 5.2.2.1 Manganese The manganese content shall be determined by flame atomic absorption spectrometry (FAAS) (see B.2). 5.2.2.2 Iron (II) : Fe (II) The iron (II) content is expressed as C (II)(see B.1.2.5.3). 5.2.2.3 Insoluble matters The 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 P
