1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21190-5 SANS 50882:2008Edition 1EN 882:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for hum
4、an consumption Sodium aluminate This national standard is the identical implementation of EN 882:2004 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax:
5、 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 50882:2008 Edition 1 EN 882:2004 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA TC 5140.19, Water, in accordance with proced
6、ures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in March 2008. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 882 November 2004 ICS 71.100.80 Supersedes EN 882:1997 English version Chemicals used for treatment of water inten
7、ded for human consumption - Sodium aluminate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Aluminate de sodium Produkte zur Aufbereitung von Wasser fr menschlichen Gebrauch - Natriumaluminat This European Standard was approved by CEN on 30 September 2004. CE
8、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
9、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
10、 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
11、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 2004 CEN All rights of exploitation in any form and by any means reserved worldw
12、ide for CEN national Members. Ref. No. EN 882:2004: ESANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Description .5 4 Purity criteri
13、a8 5 Test methods10 6 Labelling Transportation Storage 11 Annex A (informative) General information on sodium aluminate.13 Annex B (normative) General rules relating to safety17 Bibliography 18 SANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing client
14、s of the SABS .EN 882:2004 (E) 3 Foreword This document (EN 882:2004) 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
15、by endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 882:1997. Significant technical differences between this edition and EN 882:1997 are as follows: a) replacement of the reference to EU Directive 80/
16、778 of 15 July 1980 with the latest Directive in force (see1); b) introduction of an annex B (normative) giving general rules relating to safety; c) expansion of Annex A by addition of A.2 “Quality of commercial product“. According to the CEN/CENELEC Internal Regulations, the national standards orga
17、nizations 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, Norway, Poland, Portugal, Slovakia, S
18、lovenia, Spain, Sweden, Switzerland and United Kingdom. SANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumpti
19、on, caused 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 nati
20、onal regulations 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
21、to regulation or control by National Authorities. SANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 5 1 Scope This document is applicable to sodium aluminate used for treatment of water intended for human consumpt
22、ion. It describes the characteristics and specifies the requirements of sodium aluminate and refers to the corresponding analytical methods. It gives information for its use in water treatment. It also determines the rules relating to safe handling and use of sodium aluminate (see Annex B). 2 Normat
23、ive 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 1302, Chemicals used for treatm
24、ent of water intended for human consumption Aluminium based coagulants Analytical methods ISO 3165, Sampling of chemical products for industrial use Safety in sampling ISO 6206, Chemical products for industrial use Sampling Vocabulary ISO 8213, Chemical products for industrial use Sampling technique
25、s Solid chemical products in the form of particles varying from powders to coarse lumps 3 Description 3.1 Identification 3.1.1 Chemical name Aluminium sodium oxide 3.1.2 Synonym or common name Sodium aluminate 3.1.3 Relative molecular mass 82 for NaAlO2.3.1.4 Empirical formula NaAlO20,1 Na2O.nH2O (n
26、 varies from 0,3 to 0,4) 3.1.5 Chemical formula NaAlO2SANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 6 3.1.6 CAS Registry Number 1)11138-49-1 3.1.7 EINECS reference 2)234-391-6 3.2 Commercial form Sodium alumin
27、ate is available as solids (powder or granules) or solutions. 3.3 Physical properties 3.3.1 Appearance The product is a white powder or granules or colourless to yellow liquid. 3.3.2 Density The absolute density of solids products is 2,35 g/cm3The tamped bulk density (powder) is between 1 g/cm3to 1,
28、2 g/cm3(depends on grain size). The density of solutions is 1,5 g/ml for a solution containing 10 % of active matter, expressed as mass fraction of aluminium in the product (10 % Al). 3.3.3 Solubility Sodium aluminate is soluble in water to yield solutions of up to 12,7 % Al at 20 C (concentration h
29、igher than 400 g/l). NOTE Depending on temperature and degree of dilution, solutions of sodium aluminate can hydrolyse and form a precipitate. 3.3.4 Vapour pressure Solid not applicable Solution not known 1) Chemical Abtracts Service Registry Number. 2) European inventory of Existing Commercial chem
30、icals Substances. SANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 7 3.3.5 Boiling point at 100 kPa 3) Solid not applicable Solution not known 3.3.6 Melting or crystallization point Solid melting point : 1 650 C
31、Solution typical values for crystallization point range between - 15 C and - 25 C 3.3.7 Specific heat Not known 3.3.8 Viscosity (dynamic) Typical values of dynamic viscosity for sodium aluminate solutions, containing 10 % Al and 12,7 % Al are given in Table 1. Table 1 Viscosity Temperature C Viscosi
32、ty mPa.s 10 % Al 12,7 % Al - 5 1 250 15 000 0 650 7 000 5 360 2 850 10 200 1 650 15 140 900 20 120 560 3.3.9 Critical temperature Not applicable 3.3.10 Critical pressure Not applicable 3.3.11 Physical hardness Solid not known Solution not applicable 3) 100 kPa = 1 bar SANS 50882:2008This s tandard m
33、ay only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 8 3.4 Chemical properties Sodium aluminate solutions are highly alkaline. Their solutions hydrolyse and form a precipitate of aluminium hydroxide when diluted beyond a particular level or neutra
34、lized. NOTE Since aluminium compounds are amphoteric in nature, the solubility of aluminium depends on the pH value and the product should to be used within an appropriate pH range. When dissolved in drinking water, calcium is partially precipitated with aluminium hydroxide. 4 Purity criteria 4.1 Ge
35、neral This document specifies the minimum purity requirements for sodium aluminate 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 other impurities may be pres
36、ent and, if so, this shall be notified to the 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, taking into account raw water
37、 quality, required dosage, contents of other impurities and additives used in the product 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 process and raw materials. I
38、f the production process or raw materials leads 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 concentration of active matter in the commercial product, expressed as a mass fraction of alu
39、minium in the product (Al %) shall be within 3 % of the manufacturers declared values. NOTE The concentration of water-soluble aluminium in commercial product varies. Typical values are given here below: Al % of the product Solid forms 27,5 to 29,1 Solution forms 10 to 13,2 SANS 50882:2008This s tan
40、dard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 9 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 2. Table 2 Limits of impurities Impurity Limit g/kg of Al Iron (Fe) max. 0,8 Insolubl
41、e matter (solid product) max 8 NOTE The value quoted for iron is both iron (II) and iron (III). Iron can be present as a component of the product and will usually be removed in the treatment process. 4.4 Chemical parameters The product shall conform to the requirements specified in Table 3. Table 3
42、Chemical parameters Limit mg/kg of Al Parameter type 1 type 2 type 3 Arsenic (As) max. 14 40 100 Cadmium (Cd) max. 3 50 100 Chromium (Cr) max. 30 700 1 000 Mercury (Hg) max. 4 10 20 Nickel (Ni) max. 20 700 1 000 Lead (Pb) max. 40 200 800 Antimony (Sb) max. 20 40 120 Selenium (Se) max. 20 40 120 NOTE
43、 Cyanide (CN-) is usually not relevant because of the acidity of the product. Pesticides and polycyclic aromatic hydrocarbons are not relevant since the raw materials used in the manufacturing process are free of them. For maximum impact of sodium aluminate on trace metal content in drinking water s
44、ee A.2. SANS 50882:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 882:2004 (E) 10 5 Test methods 5.1 Sampling 5.1.1 General Observe the general recommendations of ISO 3165 and take into account ISO 6206. 5.1.2 Solid Prepare the labora
45、tory sample(s) required 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
46、damage the container 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
47、.1.3.1.1.3. 5.1.3.1.1.3 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 th
48、e liquid until the 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
49、 similar manner, the total volume of sample required for subsequent analysis is obtained. 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 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 i
