1、BRITISH STANDARD BS EN 1208:2005 Chemicals used for treatment of water intended for human consumption Sodium calcium polyphosphate The European Standard EN 1208:2005 has the status of a British Standard ICS 71.100.80 BS EN 1208:2005 This British Standard was published under the authority of the Stan
2、dards Policy and Strategy Committee on 31 March 2005 BSI 31 March 2005 ISBN 0 580 45795 8 National foreword This British Standard is the official English language version of EN 1208:2005. It supersedes BS EN 1208:1998 which is withdrawn. The UK participation in its preparation was entrusted to Techn
3、ical 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 o
5、f 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 pro
6、posals 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 cover. The BS
7、I 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 1208 March 2005 ICS 71.100.80 Supersedes EN 1208:1997 English version Chemicals used for treatmen
8、t of water intended for human consumption - Sodium calcium polyphosphate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Polyphosphate de sodium et de calcium Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Natrium-Calcium-Polyphosphat This
9、 European Standard was approved by CEN on 3 February 2005. 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 referen
10、ces 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 responsibility of a CEN member into
11、 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, Ireland, Italy, Latvia, Lithuania,
12、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-1050 Brussels 2005 CEN All rights
13、 of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1208:2005: EEN 1208:2005 (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 - Storage.13
14、 Annex A (informative) General information on sodium calcium polyphosphate14 Bibliography 16 EN 1208:2005 (E) 3 Foreword This document (EN 1208:2005) 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 t
15、he status of a national standard, either by publication of an identical 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 1208:1997. Significant technical differences between thi
16、s edition and EN 1208:1997 are as follows: a) deletion of the reference 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 Re
17、gulations, 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, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
18、 Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 1208:2005 (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 i
19、nformation 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 characteristics of this product rem
20、ain 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 control by National Authorities. EN 1208:2005 (E) 5 1 Scope This
21、document is applicable to sodium calcium polyphosphate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium calcium polyphosphate. It gives information on its use in water treatment.
22、2 Normative references The following 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 1483, Water quality Dete
23、rmination of mercury. EN ISO 3696, Water for analytical laboratory use Specification 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 couple
24、d plasma atomic emission spectroscopy (ISO 11885:1996) . EN ISO 11969, Water quality - 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 titrimetr
25、y. ISO 3165, Sampling of chemical products for industrial use Safety in sampling. ISO 3357, Sodium tripolyphosphate and sodium pyrophosphate for industrial use Determination of total phosphorus (V) oxide content Quinoline phosphomolybdate gravimetric method. ISO 3360, Phosphoric acid and sodium phos
26、phates for industrial use (including foodstuffs) - Determination of fluorine content Alizarin complexone and lanthanum nitrate photometric method. ISO 5373. Condensed phosphates for industrial use (including foodstuffs) Determination of calcium content Flame atomic absorption spectrometric method. I
27、SO 6206, Chemical products for industrial use Sampling Vocabulary. ISO 6703-1, Water quality Determination of cyanide Part 1 : Determination of total cyanide. ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the form of particles varying from powders to c
28、oarse lumps. ISO 8288, Water quality Determination of cobalt, nickel, copper, zinc, cadmium and lead Flame atomic absorption spectrometric methods. ISO 9174, Water quality Determination of chromium Atomic absorption spectrometric methods. ISO 9965, Water quality Determination of selenium Atomic abso
29、rption spectrometric method (hydride technique). EN 1208:2005 (E) 6 3 Description 3.1 Identification 3.1.1 Chemical name Sodium calcium polyphosphate. 3.1.2 Synonym or common name Sodium calcium polyphosphate, glassy crystals or bowls. 3.1.3 Relative molecular mass Various. 3.1.4 Empirical formula (
30、NaPO 3 )n . CaO, where n is typically 5. 3.1.5 Chemical formula (NaPO 3 )n . CaO, where n is typically 5. 3.1.6 CAS Registry Number 1)23209-59-8. 3.1.7 EINECS reference 2)245-490-9. 3.2 Commercial forms The sodium calcium polyphosphate is available in a number of different physical states. 3.3 Physi
31、cal properties 3.3.1 Appearance The product is white glassy crystals, spheres. 3.3.2 Density For the solid product it is not applicable. 3.3.3 Solubility in water The solubility in water is approximately 0,005 g/l at 25 C. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Exist
32、ing Commercial Chemical Substances. EN 1208:2005 (E) 7 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100kPa 3)Not applicable. 3.3.6 Melting point As the product is a glass, an accurate melting point cannot be measured. By increasing the temperature higher than 900 C, the product becom
33、es less and less viscous. 3.3.7 Specific heat Not known. 3.3.8 Viscocity (dynamic) For the solid product it is not applicable. 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 The solutions of sodium
34、calcium polyphosphate have neutral reactions. The pH value of a solution of a mass fraction of 1 % is approximately 5 to 7. 3) 100 kPa = 1 bar. EN 1208:2005 (E) 8 4 Purity criteria 4.1 General This document specifies the minimum purity requirements for sodium calcium polyphosphate used for the treat
35、ment 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 the user and when necessary to relevant authorities. NOTE U
36、sers 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 other impurities and additives used in the products not stated
37、 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 the production process or raw materials leads to significant quantities of impurities, by-products
38、 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 basis: phosphate content expressed as P 2 O 5: mass fraction of 61 % to 69 %; sodium content expressed as Na 2 O : mass fractio
39、n of 20 % to 30 %; calcium content expressed as CaO : mass fraction of 7 % to 15 %. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 Impurities Impurity Limit mg/kg of dry product Sulfate (SO 4 2- ) max. 500 Fluoride (F - ) max. 10 4.4 C
40、hemical 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 1208:2005 (E) 9 Table 2 Chemical parameters Parameter Limit mg/kg of dry pro
41、duct 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 hydrocarbons are not relevant in sodium calcium polyphosphate. For parame
42、tric values of sodium calcium polyphosphate on trace metal content in drinking water, see 1. 5 Test methods 5.1 Sampling Observe the recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratory sample(s) required by the relevant procedure described in ISO 8213. 5.2 Analyses 5.2.1
43、 Main product 5.2.1.1 Phosphate (main product) The determination of the concentration of phosphate (P 2 O 5 ) is carried out according to ISO 3357. 5.2.1.2 Calcium oxide (main product) The determination of the concentration of calcium oxide (CaO) is carried out according to ISO 5373. 5.2.1.3 Sodium
44、oxide (main product) 5.2.1.3.1 General The determination of the concentration of sodium oxide (Na 2 O) is carried out in accordance with the method of determination of sodium oxide (Na 2 O) and phosphate (P 2 O 5 ) ; calculation of molar ratio. 5.2.1.3.2 Principle Alkalimetric titration. Consumption
45、 of alkali to increase pH value from 4,45 to 9,22. EN 1208:2005 (E) 10 5.2.1.3.3 Reagents All the reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 specified in EN ISO 3696 and shall be boiled and cooled immediately before use. 5.2.1.3.3.1 Sodium hydroxid
46、e solution, c(NaOH) = 0,5 mol/l 5.2.1.3.3.2 Sulfuric acid solution, c(1/2 H 2 SO 4 ) = 0,5 mol/l 5.2.1.3.3.3 Indicator for titrating alkali oxide Dissolve 150 mg bromocresol green, 9 mg methyl red, 470 mg p-nitrophenol, 600 mg phenolphthalein in 100 ml ethanol. 5.2.1.3.3.4 Solution for comparison, p
47、H : 4,45 Dissolve (30 0,001) g of potassium dihydrogen phosphate (KH 2 PO 4 ) in 1 000 ml of water. 5.2.1.3.3.5 Solution for comparison, pH : 9,22 Dissolve (76 0,001) g of disodium hydrogen phosphate dodecahydrate (Na 2 HPO 4. 12 H 2 O) in 1 000 ml of water. 5.2.1.3.4 Apparatus Ordinary laboratory a
48、pparatus and optionally potentiometer with pH electrode. 5.2.1.3.5 Procedure 5.2.1.3.5.1 Preparation of comparison solution Dilute 50 ml of solution (5.2.1.3.3.4) with 50 ml of water in a conical flask. Add four drops of indicator (5.2.1.3.3.3). The colour corresponds to pH 4,45. Dilute 50 ml of sol
49、ution (5.2.1.3.3.5) with 50 ml of water in a conical flask. Add four drops of indicator (5.2.1.3.3.3). The colour corresponds to pH 9,22. NOTE The preparation of comparison solution is not necessary in the case of potentiometric titration. 5.2.1.3.5.2 Test solution Weigh, to the nearest 0,1 mg, about 2,5 g of the laboratory sample of solid product (m 0 ) or a mass, from the product in solution evaporating to dryness at (105 5)C,
