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1、BRITISH STANDARD BS EN 12175:2001 Chemicals used for treatment of water intended for human consumption Hexafluorosilicic acid The European Standard EN 12175:2001 has the status of a British Standard ICS 71.100.80; 13.060.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licen
2、sed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12175:2001 This British Standard, having been prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was published under the authority of the Sta
3、ndards Policy and Strategy Committee on 05 November 2001 BSI 05 November 2001 ISBN 0 580 38208 7 National foreword This British Standard is the official English language version of EN 12175:2001. The UK participation in its preparation was entrusted to Technical Committee CII/59, Chemicals for drink
4、ing water treatment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Additional information Article 10 of the Council of the European Community Directive 98/83/EC on the quality of water intended for human consumptio
5、n requires Member States to ensure that substances and materials (including associated impurities) used in the preparation of drinking water do not remain in treated water at concentrations that are higher than necessary or that would reduce the protection of public health provided for in the Direct
6、ive. This requirement is given effect in England and Wales by regulation 25 of the Water Supply (Water Quality) Regulations 1989 (similar provisions apply in Scotland and Northern Ireland). Regulation 25 makes provision for attaching conditions of use to chemicals and filter media that are authorize
7、d for use in public water supplies. Details of conditions of use are contained in the List of Products and Processes Approved Under Regulations 25 and 26 For Use In Connection With The Supply of Water For Drinking, Washing, Cooking and Food Production Purposes published by the Drinking Water Inspect
8、orate, Floor 2/A1, Ashdown House, 123 Victoria Street, London SW1E 6DE (www.dwi.gov.uk). Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International St
9、andards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Sta
10、ndard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developmen
11、ts 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 20, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued s
12、ince publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12175 August 2001 ICS 71.100.80 English version Chemicals used for treatment of water intended for hu
13、man consumption - Hexafluorosilicic acid Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Acide hexafluorosilicique Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Hexafluorokieselsure This European Standard was approved by CEN on 23 June 20
14、01. 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
15、on application to the Management Centre 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 Management Centre h
16、as the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMI
17、TTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12175:2001 E Licensed Copy: sheffield
18、un sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (E) 2 Contents page Foreword3 Introduction.4 1Scope 5 2Normative references 5 3Description .5 3.1Identification.5 3.2Commercial form6 3.3Physical properties6 3.4Chemical properties 7 4Purity criteria7 4.
19、1Composition of commercial product.7 4.2Impurities and main by-products.7 4.3Chemical parameters.8 5Test methods8 5.1General8 5.2Sampling.8 5.3Analyses .9 6Labelling - Transportation - Storage16 6.1Means of delivery.16 6.2Risk and safety labelling according to the EU Directives .16 6.3Transportation
20、 regulations and labelling16 6.4Marking .17 6.5Storage17 Annex A (informative) General information on hexafluorosilicic acid.18 A.1Origin.18 A.2Use.18 Annex B (normative) General rules relating to safety.19 B.1Rules for safe handling and use.19 B.2Emergency procedures.19 Bibliography20 Licensed Copy
21、: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (E) 3 Foreword This European Standard 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 s
22、tatus of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2002, and conflicting national standards shall be withdrawn at the latest by February 2002. Annex A is informative. Annex B is normative. According to the CEN/CENELEC Internal Regula
23、tions, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Un
24、ited Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (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 standard : a
25、) 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 European criteria, existing national regulations concerning the use and/or the chara
26、cteristics of this product remain in force. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (E) 5 1 Scope This European Standard is applicable to hexafluorosilicic acid used for treatment of water intended for human consumption
27、. It describes the characteristics of hexafluorosilicic acid and specifies the requirements and the corresponding test methods for hexafluorosilicic acid. It gives information on its use in water treatment. 2 Normative references This European Standard incorporates by dated or undated reference, pro
28、visions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in i
29、t by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). 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
30、in sampling. ISO 5440, Sodium hexafluorosilicate for industrial use - Determination of phosphate content - Molybdovanadate spectrophotometric method. ISO 5993, Sodium hydroxide for industrial use - Determination of mercury content - Flameless atomic absorption spectrometric method. ISO 6206, Chemica
31、l products for industrial use - Sampling Vocabulary. ISO 6353-1, Reagents for chemical analysis. Part 1: General test methods. 3 Description 3.1 Identification 3.1.1 Chemical name Hexafluorosilicic acid. 3.1.2 Synonym or commons names Hydrofluosilicic acid. Silicate -hexafluoro -dihydrogen. Fluorosi
32、licic acid, HFSA. 3.1.3 Relative molecular mass 144,09. 3.1.4 Empirical formula H2SiF6. 3.1.5 Chemical formula H2SiF6. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (E) 6 3.1.6 CAS-Registry Number1) 16961-83-4. 3.1.7 EINECS r
33、eference2) 241-034-8. 3.2 Commercial form Hexafluorosilicic acid is an aqueous solution. 3.3 Physical properties 3.3.1 Appearance and odour Hexafluorosilicic acid is a clear, colourless liquid with a pungent odour. 3.3.2 Density The density of a 35 % (m/m) solution at 25 C is 1,35 g/ml. The density
34、of a 20 % (m/m) solution at 25 C is 1,18 g/ml. 3.3.3 Solubility (in water) The product is miscible in any proportion. 3.3.4 Vapour pressure The vapour pressure at 20 C is approximately 3 kPa). 3.3.5 Boiling point at 100 kPa3 The product boils and decomposes at 110 C. 3.3.6 Crystallisation point A 35
35、 % (m/m) solution crystallizes at -30 C, a 20 % (m/m) solution crystallizes at -11,6 C. 3.3.7 Specific heat Not known. 3.3.8 Viscosity dynamic A 20 % (m/m) solution has a dynamic viscosity of 1,4 MPa?s at 25 C. 3.3.9 Critical temperature Not applicable. 1) Chemical Abstracts Service Registry Number.
36、 2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (E) 7 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4
37、Chemical properties Hexafluorosilicic acid is only stable in an aqueous solution. On evaporation it decomposes to hydrogen fluoride (HF) and silicon tetrafluoride (SiF4). It produces hydrogen on contact with metals, e.g. steel, nickel, aluminium. It is a strong acid and reacts violently with alkalis
38、. It forms hydrogen fluoride (HF) on contact with concentrated acids. It attacks glass. 4 Purity criteria Limits have been given for impurities and toxic substances where these are likely to be present in significant quantities from the current production process and raw materials. If a change in th
39、e production process or raw materials leads to significant quantities of other impurities or by-products being present, this shall be notified to the user. 4.1 Composition of commercial product The product shall contain between 20 percent by mass and 40 % (m/m) hexafluorosilicic acid, the remainder
40、being water. The concentration of hexafluorosilicic acid shall be within ? 5 % of the manufacturers declared value. 4.2 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 Impurities ImpurityLimit in % (m/m) commercial product Phosphate as P2O5
41、 max.0,75 Free hydrogen fluoride as HF max.1,5 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12175:2001 (E) 8 4.3 Chemical parameters The product shall conform to the requirements specified in Table 2. Table 2 Chemical parameters Parame
42、terLimit mg/kg H2SiF6 (100 %) Antimony (Sb)max.80 Arsenic (As)max.400 Cadmium (Cd)max.40 Chromium (Cr)max.400 Lead (Pb)max.400 Mercury (Hg)max.10 Nickel (Ni)max.400 Selenium (Se)max.80 NOTEOther chemical parameters and indicator parameters -as listed in EU Directive 98/83/EEC (see 1)- are not releva
43、nt in hexafluorosilicic acid because the raw materials used in the manufacturing process are free of them. 5 Test methods 5.1 General SAFETY PRECAUTIONS Hexafluorosilicic acid shall be handled with extreme care, see B.1. All equipment in contact with hexafluorosilicic acid shall be made in plastics
44、(for example polyethylene or polytetrafluoroethylene (PTFE), avoid contact with the glass. 5.2 Sampling 5.2.1 General Observe the general recommendations of ISO 3165 and take account of ISO 6206. NOTEThe sampling is carried out at the premises of the manufacturer of the hexafluorosilicic acid unless
45、 the customer has adequate facilities to carry out this operation safely at his own premises. 5.2.2 Sampling from drums and bottles 5.2.2.1 General 5.2.2.1.1Mix the contents of the container to be sampled by shaking the container, by rolling it or by rocking it from side to side, taking care not to
46、damage the container or spill any of the liquid. 5.2.2.1.2If the design of the container is such (for example, a narrow-necked bottle) that it is impracticable to use a sampling implement, take a sample by pouring after the contents have been thoroughly mixed. Otherwise, proceed as described in 5.2.
47、2.1.3. 5.2.2.1.3Examine the surface of the liquid. If there are signs of surface contamination, take samples from the surface as described in 5.2.2.2; otherwise, take samples as described in 5.2.2.3. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 05:42:51 GMT+00:00 2006, Uncontrolled Copy, (
48、c) BSI EN 12175:2001 (E) 9 5.2.2.2 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 before it fills completely and allow any liquid adhering to the ladle to drain
49、 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. 5.2.2.3 Procedure of sampling from a container The samples for testing the hexafluorosilicic acid shall be taken by means of a sampling tube, for example. A tube made of polytetrafluoroethylene (PTFE), approximately 1500 mm long, with 14,5 mm inside diameter and 1,25 mm wall thickness tapering to an inside diameter of approximately 5 m
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