1、BRITISH STANDARD BS EN 885:2004 Chemicals used for treatment of water intended for human consumption Polyaluminium chloride hydroxide silicate The European Standard EN 885:2004 has the status of a British Standard ICS 71.100.80 BS EN 885:2004 This British Standard was published under the authority o
2、f the Standards Policy and Strategy Committee on 2 December 2004 BSI 2 December 2004 ISBN 0 580 44945 9 National foreword This British Standard is the official English language version of EN 885:2004. It supersedes BS EN 885:2001 which is withdrawn. The UK participation in its preparation was entrus
3、ted to Technical 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
4、 referred to 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
5、provisions of 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 interpreta
6、tion, or proposals 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 16, an inside back cover and a back c
7、over. The BSI copyright 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 885 November 2004 ICS 71.100.80 Supersedes EN 885:2001 English version Chemicals used
8、 for treatment of water intended for human consumption - Polyaluminium chloride hydroxide silicate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Polyhydroxychlorosilicate daluminium Produkte zur Aufbereitung von Wasser fr den Menschlichen Gebrauch - Polyalum
9、iniumhydroxidchloridsilikat This European Standard was approved by CEN 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
10、 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 r
11、esponsibility 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, I
12、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, 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
13、-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 885:2004: EEN 885:2004 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Description .5 4 Purity criteria8 5 Test methods9 6 Label
14、ling - Transportation - Storage10 Annex A (informative) General information on polyaluminium chloride hydroxide silicate .12 Annex B (normative) General rules relating to safety15 Bibliography 16 EN 885:2004 (E) 3 Foreword This document (EN 885:2004) has been prepared by Technical Committee CEN/TC 1
15、64 “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 withdrawn at the latest by May 2
16、005. This document supersedes EN 885:2001. Significant technical differences between this edition and EN 885:2001 are as follows: a) Replacement of the reference to EU Directive 80/778 of July, 15 1980 with the latest Directive in force (see1); b) expansion of annex A by addition of A.2 “quality of
17、commercial product“. 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, Irela
18、nd, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 885:2004 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the prod
19、uct covered by this document: a) this document 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 conce
20、rning the use and/or the characteristics of this product remain in force. NOTE Conformity with this document 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 contr
21、ol by National Authorities. EN 885:2004 (E) 5 1 Scope This document is applicable to polyaluminium chloride hydroxide silicate used for treatment of water intended for human consumption. It describes the characteristics of polyaluminium chloride hydroxide silicate and specifies the requirements for
22、polyaluminium chloride hydroxide silicate and refers to the corresponding analytical methods. It gives information on its use in water treatment. It also determines the rules relating to safe handling and use of polyaluminium chloride hydroxide silicate (see annex B). 2 Normative references The foll
23、owing 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 referenced document (including any amendments) applies. EN 1302, Chemicals used for treatment of water intended f
24、or human consumption Aluminium based coagulants Analytical methods. ISO 3165, Sampling of chemical products for industrial use Safety in sampling. ISO 6206, Chemical products for industrial use Sampling Vocabulary. 3 Description 3.1 Identification 3.1.1 Chemical name Polyaluminium chloride hydroxide
25、 silicate. 3.1.2 Synonym or common name Polyaluminium chloride silicate. 3.1.3 Relative molecular mass Variable (see 3.1.4). 3.1.4 Empirical formula Polyaluminium chloride hydroxide silicate is a synthetically manufactured polymerized basified aluminium salt containing silicate. The structure of the
26、 product is polymeric. Al(Na) d (OH) a (SiOx) c Cl bwith a + b + 2c (x 2) = 3 + d and a = 1,05 to 2,4 b = 0,5 to 3 c = 0,01 to 0,3 d = 0,005 to 2 x 2 EN 885:2004 (E) 6 3.1.5 Chemical formula Variable (see 3.1.4). 3.1.6 CAS Registry Number 1)Aluminium chloride hydroxide silicate: 94894-80-1. 3.1.7 EI
27、NECS reference 2)The following is a list of EINECS reference numbers for products or their starting materials. Aluminium hydroxide chloride: 215-477-2. Aluminosilicate: 215-475-1. Sodium chloride: 231-598-3. 3.2 Commercial form The product is available as a liquid. 3.3 Physical properties 3.3.1 Appe
28、arance Polyaluminium chloride hydroxide silicate is a colourless to yellow, clear liquid. 3.3.2 Density The density depends on the particular composition, especially the aluminium ion content, expressed as a mass fraction of aluminium (Al) in %. Typical values are 1,20 g/ml to 1,25 g/ml for 5,3 % Al
29、. 3.3.3 Solubility in water Polyaluminium chloride hydroxide silicate is fully miscible with water. NOTE Depending on the particular product, dilute solutions can hydrolyse and form a precipitate. 3.3.4 Vapour pressure at 20 C Not known. 3.3.5 Boiling point at 100 kPa 3)100 C. 1) Chemical Abstracts
30、Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. EN 885:2004 (E) 7 3.3.6 Crystallization point Typical value is - 10 C for 5,3 % Al. 3.3.7 Specific heat Not known. 3.3.8 Viscosity (dynamic) Typical value is 15 mPa.s for 5,3 %Al at 20 C. 3
31、.3.9 Critical temperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Polyaluminium chloride hydroxide silicate is an acidic liquid which hydrolyses and forms a precipitate of aluminium hydroxide when diluted beyond a part
32、icular concentration. NOTE Since aluminium compounds are amphoteric in nature, the solubility of aluminium depends on the pH value and the product should be used within an appropriate pH range. EN 885:2004 (E) 8 4 Purity criteria 4.1 General This document specifies the minimum purity requirements fo
33、r polyaluminium chloride hydroxide silicate 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
34、to the user and when necessary to relevant authorities. NOTE Users of the 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 o
35、ther impurities and additives used in the product not stated in this document. 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 in the production process or raw mater
36、ials 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 concentration of active matter (aluminium ion content) in the commercial product expressed as grams per kilogram of product shall b
37、e not less than 50 g/kg. The content of aluminium shall be within 3 % of the manufacturers declared value. The relative basicity expressed as the mole ratio OH/3Al shall be greater than 0,35. 4.3 Impurities and main by-products The content of insoluble matters shall not exceed 25 g/kg of Al. 4.4 Che
38、mical parameters The product shall conform to the requirements specified in Table 1. Table 1 Chemical parameters Limit (mg/kg of Al) Parameter type 1 type 2 type 3 Arsenic (As) max. 14 40 100 Cadmium (Cd) max. 3 50 100 Chromium (Cr) max. 30 700 1 000 Mercury (Hg) max. 4 10 20 Nickel (Ni) max. 20 700
39、 1 000 Lead (Pb) max. 40 200 800 Antimony (Sb) max. 20 40 120 Selenium (Se) max. 20 40 120 NOTE Cyanide (CN - ) is usually not relevant because of the acidity of the product. Pesticides and polycyclic aromatic hydrocarbons are not relevant since the raw materials used in the manufacturing process ar
40、e free of them. For maximum impact of the product on trace metal content in drinking water see A.2. EN 885:2004 (E) 9 5 Test methods 5.1 Sampling 5.1.1 General Observe the general rules of ISO 3165 and take into account ISO 6206 5.1.2 Sampling from drums and bottles 5.1.2.1 General 5.1.2.1.1 Mix the
41、 contents 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
42、 use 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, t
43、ake samples 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
44、 ladle 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 sa
45、mpling 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 bef
46、ore the tube is filled. Close the tube, withdraw it from the container and allow any liquid adhering to 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 a
47、n open 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 b
48、ottom-sampling apparatus; c) from one or more positions, depending on the overall depth, between the bottom and the surface using a weighted sampling can. 5.2 Analyses Use the relevant methods for analysis described in EN 1302. EN 885:2004 (E) 10 6 Labelling - Transportation - Storage 6.1 Means of d
49、elivery The product shall be delivered in tankers of corrosion-resistant materials suitable for the purpose. NOTE The manufacturer can provide advice on suitable materials. 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)One of the two following labelling req
