1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12175:2013Chemicals used for treatmentof water intended forhuman consumption Hexafluorosilicic acidBS EN 12175:2013 BRITISH STANDARDNational forewordThis British Standard i
2、s the UK implementation of EN 12175:2013. Itsupersedes BS EN 12175:2006 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can beobtained on request to its
3、 secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80010 8ICS 13.060.20; 71.100.80Compliance with a British S
4、tandard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2013.Amendments issued since publicationDate Text affectedBS EN 12175:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12175 M
5、ay 2013 ICS 71.100.80 Supersedes EN 12175:2006English Version Chemicals used for treatment of water intended for human consumption - Hexafluorosilicic acid Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Acide hexafluorosilicique Produkte zur Aufbereitung von
6、Wasser fr den menschlichen Gebrauch - Hexafluorkieselsure This European Standard was approved by CEN on 28 March 2013. 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
7、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 lang
8、uage 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, Denmar
9、k, 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 COMMITTEE F
10、OR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12175:2013: EBS EN 12175:2013EN 12175:2013 (
11、E) 2 Contents Page Foreword . 3 Introduction 4 1 Scope 5 2 Normative references . 5 3 Description . 5 3.1 Identification . 5 3.2 Commercial form 6 3.3 Physical properties 6 3.4 Chemical properties . 7 4 Purity criteria 7 4.1 General . 7 4.2 Composition of commercial product . 7 4.3 Impurities and ma
12、in by-products 7 4.4 Chemical parameters . 8 5 Test methods 8 5.1 General . 8 5.2 Sampling . 8 5.3 Analyses . 9 6 Labelling - Transportation - Storage . 17 6.1 Means of delivery . 17 6.2 Labelling according to the EU legislation . 17 6.3 Transportation regulations and labelling 17 6.4 Marking . 18 6
13、.5 Storage . 18 Annex A (informative) General information on hexafluorosilicic acid 19 A.1 Origin 19 A.2 Use 19 Annex B (normative) General rules relating to safety . 20 B.1 Rules for safe handling and use 20 B.2 Emergency procedures 20 Bibliography 21 BS EN 12175:2013EN 12175:2013 (E) 3 Foreword Th
14、is document (EN 12175:2013) 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 text or by endorsement, at the latest by November
15、2013, and conflicting national standards shall be withdrawn at the latest by November 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 for identifying any or all such patent ri
16、ghts. This document supersedes EN 12175:2006. Significant differences between this edition and EN 12175:2006 are as follows: The replacement of warning and safety precautions notes by labelling according to Regulation (EC) No 1272/2008. According to the CEN-CENELEC Internal Regulations, the national
17、 standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuan
18、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12175:2013EN 12175:2013 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, cause
19、d by the product 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 regu
20、lations concerning 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 regula
21、tion or control by National Authorities. BS EN 12175:2013EN 12175:2013 (E) 5 1 Scope This European Standard is applicable to hexafluorosilicic acid used for treatment of water intended for human consumption. It describes the characteristics of hexafluorosilicic acid and specifies the requirements an
22、d the corresponding test methods for hexafluorosilicic acid. It gives information on its use in water treatment. It also determines the rules relating to safe handling and use of hexafluorosilicic acid (see Annex B). 2 Normative references The following documents, in whole or in part, are normativel
23、y 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 document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use Specification and
24、test methods (ISO 3696) ISO 3165, Sampling of chemical products for industrial use Safety 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 mer
25、cury content Flameless atomic absorption spectrometric method ISO 6206, Chemical 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 commo
26、ns names Hydrofluosilicic acid. Silicate-hexafluorodihydrogen. Fluorosilicic acid. HFSA. 3.1.3 Relative molecular mass 144,09. 3.1.4 Empirical formula H2SiF6. BS EN 12175:2013EN 12175:2013 (E) 6 3.1.5 Chemical formula H2SiF6.3.1.6 CAS-Registry Number1)16961-83-4. 3.1.7 EINECS reference2)241-034-8. 3
27、.2 Commercial form The product is an aqueous solution. 3.3 Physical properties 3.3.1 Appearance and odour The product is a clear, colourless liquid with a pungent odour. 3.3.2 Density The density of a mass fraction 35 % solution at 25 C is 1,35 g/ml. The density of a mass fraction 20 % solution at 2
28、5 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 kPa3). 3.3.5 Boiling point at 100 kPa The product boils and decomposes at 110 C. 3.3.6 Crystallisation point A solution of mass fraction of 35
29、 % crystallises at -30 C and of a mass fraction of 20 % crystallises at -11,6 C. 3.3.7 Specific heat Not known. 3.3.8 Viscosity dynamic A solution of a mass fraction of 20 % has a dynamic viscosity of 1,4 MPa.s at 25 C. 1) Chemical Abstracts Service Registry Number. 2)European Inventory of Existing
30、Commercial Chemical Substances. 3)100 kPa = 1 bar. BS EN 12175:2013EN 12175:2013 (E) 7 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 Hexafluorosilicic acid is only stable in an aqueous solution. On
31、 evaporation, it decomposes to hydrogen fluoride (HF) and silicon tetrafluoride (SiF4). It produces hydrogen on contact with metals, e.g. steel, nickel and aluminium. It is a strong acid and reacts violently with alkalis. It forms hydrogen fluoride (HF) on contact with concentrated acids. It attacks
32、 glass. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for hexafluorosilicic acid 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 man
33、ufacturing process, other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. 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
34、 consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the products not stated in this document. Limits have been given for impurities and chemicals parameters where these are likely to be present in significant quantities from the cu
35、rrent production process and raw materials. If the production process or raw materials 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 between a mass fraction of
36、20 % and 40 % hexafluorosilicic acid, the remainder being water. The concentration of hexafluorosilicic acid shall be within 5 % of the manufacturers declared value. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 Impurities Impurity Li
37、mit in mass fraction in % of commercial product Phosphate as P2O5 max.0,75 Free hydrogen fluoride as HF max. 1,5 BS EN 12175:2013EN 12175:2013 (E) 8 4.4 Chemical parameters The product shall conform to the requirements specified in Table 2. Table 2 Chemical parameters Parameter Limit mg/kg H2SiF6 (1
38、00 %) 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 NOTE Other chemical parameters and indicator parameters are not relevant in hexafluorosilicic acid because the raw material
39、s used in the manufacturing process are free of them. For parametric values of hexafluorosilicic acid on trace metal content in drinking water, see 1. 5 Test methods 5.1 General SAFETY PRECAUTIONS Hexafluorosilicic acid shall be handled with extreme care, see B.1. All equipment in contact with hexaf
40、luorosilicic acid shall be made of plastics (for example polyethylene or polytetrafluoroethylene (PTFE); avoid contact with glass. 5.2 Sampling 5.2.1 General Observe the general recommendations of ISO 3165 and take account of ISO 6206. The sampling is carried out at the premises of the manufacturer
41、of the hexafluorosilicic acid unless 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 5.2.2.1.1 Mix the contents of each container to be sampled by shaking the container, by rolling it or by rocking it
42、from side to side, taking care not to damage the container or spill any of the liquid. 5.2.2.1.2 If 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.
43、Otherwise, proceed as described in 5.2.2.1.3. BS EN 12175:2013EN 12175:2013 (E) 9 5.2.2.1.3 Examine the surface of the liquid. If there are signs of surface contamination, take samples from the surface as described in 5.2.2.2; otherwise, take samples as described in 5.2.2.3. 5.2.2.2 Surface sampling
44、 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 off. If necessary, repeat this operation so that,
45、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 exampl
46、e. A tube made of polytetrafluoroethylene (PTFE), approximately 1 500 mm long, with 14,5 mm inside diameter and 1,25 mm wall thickness tapering to an inside diameter of approximately 5 mm at one end, may be used for this; fit a rubber tube approximately 200 mm long which can be closed by means of a
47、pinch clip, to the other end. When taking the samples, insert the sampling tube as far as possible into the acid to be tested with the clip released. Do this slowly so that the levels of liquid in the sampling tube and in the acid container are the same. Close the clip, withdraw the sampling tube fr
48、om the acid, allow any liquid adhering at the outside of the tube to drain off, and by releasing the clip discharge the contents of the sampling tube into a polytetrafluoroethylene (PTFE) bottle of 1 000 ml nominal capacity provided with a ground PTFE stopper. Stopper the bottle immediately after fi
49、lling each with the content of the sampling tube. After shaking thoroughly, fill from the collective sample three PTFE bottles, each with a volume of approximately 250 ml and provided with a ground PTFE stopper. Stopper, seal and label the bottles. One of these samples is to be tested by the consignee; the other two shall be kept in case subsequent complaint requires further testing to be carried out. 5.2.3 Sampling from tanks and tankers From each access point, take samples as follows: a) from the surface of the liquid, using
