BS EN 14805-2008 Chemicals used for treatment of water intended for human nconsumption - Sodium chloride for on site electrochlorination nusing non-membrane technology《人类用水处理的化学试剂 .pdf

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1、BS EN 14805:2008ICS 13.060.25; 71.100.80NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDChemicals used fortreatment of waterintended for humanconsumption Sodium chloride for onsite electrochlorinationusing non-membranetechnologyThis British Standardwas published

2、 under theauthority of the StandardsPolicy and StrategyCommittee on 31 December2008 BSI 2008ISBN 978 0 580 54202 2Amendments/corrigenda issued since publicationDate CommentsBS EN 14805:2008National forewordThis British Standard is the UK implementation of EN 14805:2008.The UK participation in its pr

3、eparation was entrusted to TechnicalCommittee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible

4、for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 14805:2008EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14805June 2008ICS 71.100.80English VersionChemicals used for treatment of water intended for humanconsumption - Sodium chlorid

5、e for on site electrochlorinationusing non-membrane technologyProduits chimiques utiliss pour le traitement de leaudestine la consommation humaine - Chlorure de sodiumpour la gnration lectrochimique de chlore utilisant destechnologies non membranairesProdukte zur Aufbereitung von Wasser fr denmensch

6、lichen Gebrauch - Natriumchlorid zurelektrochemischen Erzeugung von Chlor vor Ort mittelsmembranloser VerfahrenThis European Standard was approved by CEN on 29 May 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanSt

7、andard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, Frenc

8、h, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Cze

9、ch Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN

10、 DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14805:2008: EBS EN 14805:2008EN 14805:2008 (E) 2 Contents Page Foreword3 Intro

11、duction .4 1 Scope 5 2 Normative references 5 3 Description .5 3.1 Identification.5 3.2 Commercial forms .6 3.3 Physical properties6 3.4 Chemical properties 8 4 Purity criteria8 4.1 General8 4.2 Composition of commercial product.9 4.3 Impurities and main by-products.9 4.4 Chemical parameters 9 5 Tes

12、t methods10 5.1 Sampling.10 5.2 Analyses .10 6 Labelling - transportation - storage .14 6.1 Means of delivery.14 6.2 Risk and safety labelling in accordance with EU directives .15 6.3 Transportation regulations and labelling15 6.4 Marking .15 6.5 Storage15 Annex A (informative) General information o

13、n sodium chloride for electrochlorination 16 Annex B (normative) Analytical methods .18 Bibliography 33 BS EN 14805:2008EN 14805:2008 (E) 3 Foreword This document (EN 14805:2008) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This Europ

14、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn at the latest by December 2008. Attention is drawn to the possibility that some of the el

15、ements 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 rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this

16、European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the Un

17、ited Kingdom. BS EN 14805:2008EN 14805:2008 (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 European Standard: a) this European Standard provides no information as to whether the product may be u

18、sed 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 remain in force. NOTE Conformity with this Europ

19、ean Standard 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 European Standard is subject to regulation or control by National Authorities. BS EN 14805:2008EN 14805:2008 (E) 5 1 Scope This European S

20、tandard is applicable to sodium chloride intended for on site electrochlorination of water intended for human consumption using non-membrane technology. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium chloride (see Annex B). It gives info

21、rmation on its use in water treatment. 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 amendmen

22、ts) applies. EN 973:2002, Chemicals used for treatment of water intended for human consumption Sodium chloride for regeneration of ion exchangers EN ISO 3696, Water for analytical laboratory use Specification and test methods (ISO 3696:1987) ISO 2479, Sodium chloride for industrial use Determination

23、 of matter insoluble in water or in acid and preparation of principal solutions for other determinations ISO 2480, Sodium chloride for industrial use Determination of sulphate content Barium sulphate gravimetric method ISO 2482, Sodium chloride for industrial use Determination of calcium and magnesi

24、um contents EDTA complexometric methods ISO 2483, Sodium chloride for industrial use Determination of the loss of mass at 110 degrees C ISO 3165, Sampling of chemical products for industrial use Safety in sampling ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 6227, Chemical

25、products for industrial use General method for determination of chloride ions Potentiometric method ISO 8213, Chemical products for industrial use Sampling techniques Solid chemical products in the form of particles varying from powders to coarse lumps 3 Description 3.1 Identification 3.1.1 Chemical

26、 name Sodium chloride 3.1.2 Synonym or common name Salt 3.1.3 Relative molecular mass 58,45 BS EN 14805:2008EN 14805:2008 (E) 6 3.1.4 Empirical formula NaCl 3.1.5 Chemical formula NaCl 3.1.6 CAS Registry Number1)7647-14-5 3.1.7 EINECS Reference2)231-598-3 3.2 Commercial forms The product is availabl

27、e as rock salt, sea salt or evaporated salt, and it is supplied as free-flowing crystals or their compacted forms. 3.3 Physical properties 3.3.1 Appearance The product is white and crystalline. 3.3.2 Density The density of the solid crystal is 2,16 g/cm3 at 20 C. The bulk density depends on the part

28、icle size distribution. 1) Chemical Abstracts Service Registry Number. 2) European Inventory of Existing Commercial chemical Substances Reference. BS EN 14805:2008EN 14805:2008 (E) 7 3.3.3 Solubility (in water) The solubility of the product depends on the temperature as given in Figure 1. Temperatur

29、e NaCl solution C Mass fraction in % - 10 25,0 0 26,34 10 26,35 20 26,43 30 26,56 40 26,71 50 26,89 60 27,09 70 27,30 80 27,53 90 27,80 100 28,12 Key 1 transition point NaCl NaCl . 2H2O Figure 1 Solubility curve for sodium chloride in water 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point a

30、t 100 kPa3)Not applicable. 3) 100 kPa = 1 bar BS EN 14805:2008EN 14805:2008 (E) 8 3.3.6 Melting point 802 C 3.3.7 Specific heat Approximately 850 J/(kgK) at 25 C for the solid. 3.3.8 Viscosity (dynamic) The viscosity of the saturated solution at 20 C is approximately 1,9 mPas. 3.3.9 Critical tempera

31、ture Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness The hardness of solid salt is given as 2 to 2,5 on the Mohs scale of hardness. 3.4 Chemical properties Sodium chloride is stable and non-volatile, and aqueous solutions have good electrical conductivity. Sodium ch

32、loride is decomposed by a number of acids. It reacts with sulfuric acid, phosphoric acid and strong oxidizing agents. The reactions are often complex and require heat for completion. NOTE Under certain conditions a sodium chloride solution can cause corrosion of metallic surfaces. 4 Purity criteria

33、4.1 General This European Standard specifies the minimum purity requirements for sodium chloride for on site electrochlorination of water intended for human consumption using non-membrane technology. As the treatment chemical produced by this process is sodium hypochlorite, limits have been calculat

34、ed from the requirements of EN 901 (sodium hypochlorite) for those impurities commonly present in the product and the chemical parameters. Consideration has also been given to the requirements of EN 973 (sodium chloride) for regeneration of ion exchangers. Depending on the raw material and the manuf

35、acturing process, other impurities may be present and, if so, this shall be notified to the user and, when necessary, to relevant authorities. NOTE 1 Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for the treatment of water intende

36、d for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the product and not stated in this product standard. NOTE 2 Using the sodium hypochlorite standard to define limits produces discrepancies with EN 973 regarding sodium

37、chloride for the regeneration of ion exchange water softeners. This should not be taken to imply any real difference between the chemical purity between salt types meeting either specification. Limits have been given for impurities and chemical parameters where these are likely to be present in sign

38、ificant quantities from the current 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. BS EN 14805:2008EN 14805:2008 (E) 9 4.2 Composition of commer

39、cial product 4.2.1 Sodium chloride content The content of sodium chloride in the dry product shall not be less than: Type 1: mass fraction of 99,9 % of dry sodium chloride, NaCl; Type 2: mass fraction of 98,5 % of dry sodium chloride, NaCl. 4.2.2 Anticaking agent Subject to any local legislation in

40、member states, an anticaking agent, sodium or potassium hexacyanoferrate, is allowed up to a maximum level in the final product of 15 mg/kg, expressed as the anhydrous hexacyanoferrate ion Fe(CN6)-4; for the determination, see B.3 of EN 973:2002. If gaseous free chlorine is produced as a stage in th

41、e electrochlorination process, the level of hexacyanoferrate ion present should be less than 3 mg/kg. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1 and Table 2. Table 1 Impurities Impurity Limit in mass fraction in % of NaCI content Type 1 Typ

42、e 2 Water-insoluble matter max. 0,05 0,35 Bromide max. 0,025 0,05 Table 2 Moisture content Impurity Limit in mass fraction in % of NaCI content Dry salt Un-dried salt Moisture content Max. 0,1 5 4.4 Chemical parameters The product shall conform to the requirements specified in Table 3. BS EN 14805:2

43、008EN 14805:2008 (E) 10 Table 3 Chemical parameters Parameter Limits in mg/kg of commercial product Type 1 Type 2 Arsenic (As) max. 0,3 1,5 Cadmium (Cd) max. 0,75 1,5 Chromium (Cr) max. 0,75 1,5 Mercury (Hg) max. 1,05 1,5 Nickel (Ni) max. 0,75 3 Lead (Pb) max. 3,5 4,5 Antimony (Sb) max. 6 7,5 Seleni

44、um (Se) max. 6 7,5 NOTE Other chemical parameters and indicator parameters are not relevant in sodium chloride, but there might be other parameter limits related to equipment performance, and some of these are listed in Annex A. 5 Test methods 5.1 Sampling A test sample of about 500 g shall be taken

45、 for analysis, ensuring that it is representative of the whole batch, and taking account of ISO 3165 and also ISO 6206. Prepare the laboratory sample(s) required in accordance with ISO 8213. 5.2 Analyses 5.2.1 Main product The mass fraction in % of sodium chloride (NaCI) shall be determined by calcu

46、lation, on the basis of the results of the determinations of sulfate according to ISO 2480, halogens according to ISO 6227, calcium and magnesium according to ISO 2482 and loss of mass on drying according to ISO 2483. Convert sulfate to calcium sulfate and unused calcium to calcium chloride, unless

47、sulfate in sample exceeds the amount necessary to combine with calcium, in which case convert calcium to calcium sulfate and unused sulfate to first to magnesium sulfate and the remaining sulfate to sodium sulfate. Convert unused magnesium to magnesium chloride. Convert unused halogens to sodium chl

48、oride. Report the sodium chloride contents on a dry matter basis, multiplying the mass fraction in % of sodium chloride by 100/(100 - P), where P in the percentage of the loss of mass on drying (see 5.2.2.2). 5.2.2 Impurities 5.2.2.1 Water-insoluble matter The content of water-insoluble matter shall

49、 be determined in accordance with ISO 2479. 5.2.2.2 Moisture content The loss of mass at 110 C shall be determined in accordance with ISO 2483. BS EN 14805:2008EN 14805:2008 (E) 11 5.2.2.3 Bromide 5.2.2.3.1 General The present method describes a titrimetric method with sodium thiosulfate for the determination of total bromine and iodine in sodium chloride. The method is applicable to products of bromine and iodine content (expressed conventionally as bromide, Br) equal to or greater than 3 mg bromine per kilogram of salt.