1、BRITISH STANDARD BS EN 1212:2005 Chemicals used for treatment of water intended for human consumption Sodium polyphosphate The European Standard EN 1212:2005 has the status of a British Standard ICS 71.100.80 BS EN 1212:2005 This British Standard was published under the authority of the Standards Po
2、licy and Strategy Committee on 31 March 2005 BSI 31 March 2005 ISBN 0 580 45798 2 National foreword This British Standard is the official English language version of EN 1212:2005. It supersedes BS EN 1212:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Com
3、mittee 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
4、 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 a cont
5、ract. 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 f
6、or 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 17 and a back cover. The BSI copyright notice displayed i
7、n this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1212 March 2005 ICS 71.100.80 Supersedes EN 1212:1997 English version Chemicals used for treatment of water intended for human
8、consumption - Sodium polyphosphate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Polyphosphate de sodium Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natriumpolyphosphat This European Standard was approved by CEN on 3 February 2005. CE
9、N 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 on app
10、lication 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 Secretariat has
11、 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, Portugal, Slo
12、vakia, 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 2005 CEN All rights of exploitation in any form and by any means reserved worldw
13、ide for CEN national Members. Ref. No. EN 1212:2005: EEN 1212:2005 (E) 2 Contents page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Description .6 4 Purity criteria8 5 Test methods9 6 Labelling - Transportation - Storage14 Annex A (informative) General information on sodium polypho
14、sphate 15 Bibliography 17 EN 1212:2005 (E) 3 Foreword This document (EN 1212:2005) 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 ident
15、ical text or by endorsement, at the latest by September 2005, and conflicting national standards shall be withdrawn at the latest by September 2005. This document supersedes EN 212:1997. Significant technical differences between this edition and EN 1212:1997 are as follows: a) deletion of the refere
16、nce to EU Directive 80/778/EEC of July, 15 1980 in order to take into account of the last Directive in force (see 1); b) replacement of ISO 5666-1 by EN 1483 and of EN 26595 by EN ISO 11969. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun
17、tries 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, Spain, Sweden, Switzer
18、land and United Kingdom. EN 1212:2005 (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 used without restriction
19、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 document does not confer or i
20、mply 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 1212:2005 (E) 5 1 Scope This document is applicable to sodium polyphosphate used for treatment of
21、water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium polyphosphate. It gives information on its use in water treatment. 2 Normative references The following referenced documents are indispensable for the a
22、pplication 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 1483, Water quality Determination of mercury. EN ISO 3696, Water for analytical laboratory use Specification
23、and test methods (ISO 3696:1987). EN ISO 5961, Water quality Determination of cadmium by atomic absorption spectrometry (ISO 5961:1994). EN ISO 11885, Water quality Determination of 33 elements by inductively coupled plasma atomic emission spectroscopy (ISO 11885:1996). EN ISO 11969, Water quality -
24、 Determination of arsenic- Atomic absorption spectrometric method (hydride technique (ISO 11969:1996). ISO 2997, Phosphoric acid for industrial use Determination of sulfate content Method by reduction and titrimetry. ISO 3165, Sampling of chemical products for industrial use Safety in sampling. ISO
25、3360, Phosphoric acid and sodium phosphates for industrial use (including foodstuffs) Determination of fluorine content Alizarin complexone and lanthanum nitrate photometric method. ISO 6206, Chemical products for industrial use Sampling Vocabulary. ISO 6703-1, Water quality Determination of cyanide
26、 Part 1: Determination of total cyanide. ISO 8213, Chemical products for industrial use Sampling technique Solid chemical products in the form of particles varying from powders to coarse lumps. ISO 8288, Water quality Determination of cobalt, nickel, copper, zinc, cadmium and lead Flame atomic absor
27、ption spectrometric methods. ISO 9174, Water quality Determination of chromium Atomic absorption spectrometric methods. ISO 9965, Water quality Determination of selenium Atomic absorption spectrometric method (hydride technique). EN 1212:2005 (E) 6 3 Description 3.1 Identification 3.1.1 Chemical nam
28、e Sodium polyphosphate. 3.1.2 Synonym or common names Polyphosphoric acid, sodium salt. 3.1.3 Relative molecular mass Various. 3.1.4 Empirical formula Na n+2 (P n O 3 n+1 ) or Na n (H 2 P n O 3N+1 ) where the degree of condensation n is at least 4. 3.1.5 Chemical formula Na n+2 (P n O 3 n+1 ) or Na
29、n (H 2 P n O 3N+1 ) where the degree of condensation n is at least 4. 3.1.6 CAS Registry Number 1)68915-31-1. 3.1.7 EINECS reference 2)272-808-3. 3.2 Commercial forms The sodium polyphosphate is available in a number of different forms (see 3.3.1). Different commercial forms, solids or dissolved in
30、water are possible. All concentrations mentioned refer to the active matter and shall be calculated accordingly. NOTE Sodium polyphosphate can be a component of mixtures sold for water treatment purposes. 3.3 Physical properties 3.3.1 Appearance Solid: The product is a white powder, granules or glas
31、s. Liquid: The product is a clear solution. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial Chemical Substances. EN 1212:2005 (E) 7 3.3.2 Density Solid: The bulk density of the product varies from 600 g/dm 3to 1 000 g/dm 3 . Liquid: The density of solution
32、 is 1,042 g/ml for a product concentration of 50 g/l at 20 C where the degree of condensation n is at least 4. 3.3.3 Solubility in water The solubility in water is approximately 1 000 g/l at 25 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa 3)Not applicable. 3.3.6 Melting po
33、int For the solid product 550 C where the degree of condensation n is at least 4. 3.3.7 Specific heat Not known. 3.3.8 Viscosity (dynamic) For the solid product it is not applicable. For the liquid the viscosity is equal to 6 mPa.s for a product concentration of 50 g/l. 3.3.9 Critical temperature No
34、t applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties The solutions of sodium polyphosphate have acidic reactions. The pH value of a solution of a mass fraction of 1 % is approximately 5 to 6. 3) 100 kPa = 1 bar. EN 1212:2005 (E) 8 4
35、Purity criteria 4.1 General This document specifies the minimum purity requirements for sodium polyphosphate 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 ot
36、her impurities may be present and, if so, this shall be notified to be 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, taki
37、ng 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 chemical parameters where these are likely to be present in significant quantities from the current production pr
38、ocess 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 conform to the following requirements on a dry mass ba
39、sis: phosphate content expressed as P 2 O 5 : mass fraction of (64 to 69) %; sodium content expressed as Na 2 O: mass fraction of (34,5 to 29) %. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 Impurities Limit Impurity mg/kg of dry pro
40、duct Sulfate (SO 4 2- ) max. 500 Fluoride (F - ) max. 10 4.4 Chemical parameters Content of various chemical parameters depends on the origin of the raw materials, most of these elements are present only as traces. The product shall conform to the requirements specified in Table 2. EN 1212:2005 (E)
41、9 Table 2 Chemical parameters Limit Parameter mg/kg of dry product Antimony (Sb) max. 3 Arsenic (As) max. 3 Cadmium (Cd) max. 3 Chromium (Cr) max. 10 Cyanide (CN) max. 5 Lead (Pb) max. 10 Mercury (Hg) max. 1 Nickel (Ni) max. 10 Selenium (Se) max. 3 NOTE Pesticides and polycyclic aromatic hydrocarbon
42、s are not relevant in sodium polyphosphate. For parametric values of sodium polyphosphate on trace metal content in drinking water, see 1. 5 Test methods 5.1 Sampling 5.1.1 General Observe the recommendations of ISO 3165 and take account of ISO 6206. 5.1.2 Solid Prepare the laboratory sample(s) requ
43、ired by the relevant procedure described in ISO 8213. 5.1.3 Liquid 5.1.3.1 Sampling from drums and bottles 5.1.3.1.1 General 5.1.3.1.1.1 Mix the 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 containe
44、r or spill any of the liquid. 5.1.3.1.1.2 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. Otherwise, proceed as described in 5.1.3.1.1.3. 5.1.3.1
45、.1.3 Examine the surface of the liquid. If there are signs of surface contamination, take samples from the surface as described in 5.1.3.1.2; otherwise, take samples as described in 5.1.3.1.3. 5.1.3.1.2 Surface sampling Take a sample using a suitable ladle. Lower the ladle into the liquid until the
46、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 ladle to drain off. If necessary, repeat this operation so that, when the other selected containers have been sampled in a similar manner, th
47、e total volume of sample required for subsequent analysis is obtained. EN 1212:2005 (E) 10 5.1.3.1.3 Bottom sampling Take a sample using an open sampling tube, or a bottom-valve sampling tube, suited to the size of container and the viscosity of the liquid. When using an open sampling tube, close it
48、 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 the tube is filled. Close the tube, withdraw it from the container and allow any liquid adhering to the outside of t
49、he 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 open sampling tube. 5.1.3.2 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 5.1.3.1.2; b) from the bottom of the tank or tanker, using a sampling tube as described in
