SANS 50889-2008 Chemicals used for treatment of water intended for human consumption - Iron (II) sulfate《人用水处理作业中使用的化学品 铁(II)硫酸》.pdf

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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 978-0-626-21424-1 SANS 50889:2008Edition 1EN 889:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for hum

4、an consumption Iron (II) sulfate This national standard is the identical implementation of EN 889:2004 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 50889:2008 Edition 1 EN 889:2004 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 proce

6、dures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in April 2008. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 889 November 2004 ICS 71.100.80 Supersedes EN 889:1998 English version Chemicals used for treatment of water inte

7、nded for human consumption - Iron (II) sulfate Produits chimiques utiliss pour le traitement de leau destine la consommation humaine - Sulfate de fer (II) Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Eisen (II) sulfat This European Standard was approved by CEN on 30 September

8、2004. 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 references concerning such national standards may be obtaine

9、d 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 its own language and notified to the Central Secreta

10、riat 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portu

11、gal, 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 2004 CEN All rights of exploitation in any form and by any means reserve

12、d worldwide for CEN national Members. Ref. No. EN 889:2004: ESANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Description .5 4 Purity

13、 criteria7 5 Test methods9 6 Labelling - Transportation - Storage11 Annex A (informative) General information on iron (ll) sulfate.12 Annex B (normative) Analytical methods .17 Annex C (informative) Determination of cadmium, chromium, nickel and lead (inductively coupled plasma optical emission spec

14、trometry (ICP/OES)30 Bibliography 32 SANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 3 Foreword This document (EN 889:2004) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of

15、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 May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 889:1

16、998. Significant technical differences between this edition and EN 889:1998 are as follows: a) replacement of the reference of to EU Directive 80/778 of 15 July 1980 with the latest Directive in force (see1); b) expansion of annex A by addition of A.2 “quality of commercial product“; c) deletion of

17、annex D. According to the CEN/CENELEC Internal Regulations, 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, L

18、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 4 Introduction In re

19、spect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this Standard: a) this Standard 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

20、 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 the standard does not confer or imply acceptance or approval of the product in any of the Member

21、 States of the EU or EFTA. The use of the product covered by this document is subject to regulation or control by National Authorities. SANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 5 1 Scope This document is

22、applicable to iron (II) sulfate heptahydrate used for treatment of water intended for human consumption. It describes the characteristics of iron (II) sulfate heptahydrate and specifies the requirements and the corresponding analytical methods for iron (II) sulfate heptahydrate (analytical methods a

23、re given in Annex B) and gives information 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 referenc

24、ed document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987). ISO 3165, Sampling of chemical products for industrial use - Safety in sampling. ISO 6206, Chemical products for industrial use - Sampling - Vocabulary.

25、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 name Iron (II) sulfate heptahydrate. 3.1.2 Synonym or common names Ferrous sulfate, iron vitri

26、ol, copperas, green salt. 3.1.3 Relative molecular mass 278,02. 3.1.4 Empirical formula FeSO4 . 7H2O. 3.1.5 Chemical formula FeSO4 . 7H2O. SANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 6 3.1.6 CAS Registry Num

27、ber1)7782-63-0 (FeSO4. 7H2O). 7720-78-7 (FeSO4). 3.1.7 EINECS reference2)231-753-5 (FeSO4). 3.2 Commercial forms The iron (ll) sulfate heptahydrate is available as wet crystals (a) or free-flowing crystals (b). 3.3 Physical properties 3.3.1 Appearance The iron (ll) sulfate heptahydrate is a light gr

28、een crystal. 3.3.2 Density The density of iron (ll) sulfate heptahydrate is equal to 1,9 g/cm3at 20 C. The bulk density of commercial form a) is equal approximately to 1 kg/dm3and of commercial form b) approximately to 0,8 kg/dm3. 3.3.3 Solubility (in water) The solubility of iron (II) sulfate hepta

29、hydrate is 487 g/l at 20 C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling point at 100 kPa3)Not applicable. 3.3.6 Melting point For the iron (ll) sulfate heptahydrate the melting starts at approximately 64 C, leading to decomposition. 3.3.7 Specific heat Not known. 3.3.8 Viscosity (dynamic) No

30、t applicable. 1)Chemical Abstracts Service Registry Number. 2)European Inventory of Existing Commercial Chemical Substances. 3)100 kPa = 1 bar. SANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 7 3.3.9 Critical te

31、mperature Not applicable. 3.3.10 Critical pressure Not applicable. 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Iron (II) sulfate heptahydrate and especially solutions of iron (II) sulfate heptahydrate have acid and reducing properties. They react by oxidation or hydrolysis (depe

32、nding on the pH). 4 Purity criteria 4.1 General This document specifies the minimum purity requirements for iron (II) sulfate 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 manufac

33、turing process other impurities may be present 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

34、 consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the product not stated in this product standard. Limits have been given for impurities and chemical parameters where these are likely to be present in significant quantities from

35、the current production process and raw materials. If 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 product shall contain not less than a mas

36、s fraction of 82,1 % of FeSO4. 7H2O (i.e. not less than a mass fraction of 16 % of Fe) and shall be within 3 % of the manufacturers declared values. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. The concentration limits refer to Fe (ll). SANS

37、 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 8 Table 1 Impurities Limit Mass fraction of Fe (ll) content in % Impurity Grade 1 Grade 2 Grade 3 Manganese max. 0,5 1 2 Insoluble matters : - wet crystal form (a) max

38、. 0,6 0,6 0,6 - free flowing form (b) max. 3 3 3 NOTE An excess of insoluble matters indicates the presence of foreign matter. Iron as a component of the product will usually be removed in the treatment process. 4.4 Chemical parameters The product shall conform to the requirements specified in Table

39、 2. The concentration limits are specified in milligrams per kilogram of Fe (II). Table 2 Chemical parameters Limit in mg/kg of Fe (II) Parameter type 1 type 2 type 3 Arsenic (As) max. 1 20 50 Cadmium (Cd) max. 1 25 50 Chromium (Cr) max. 100 350 500 Mercury (Hg) max. 0,1 5 10 Nickel (Ni) max. 300 35

40、0 500 Lead (Pb) max. 10 100 400 Antimony (Sb) max. 10 20 60 Selenium (Se) max. 1 20 60 NOTE Cyanide (CN-),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 iron (ll) sulfate on trace meta

41、l content in drinking water see A.2. SANS 50889:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 9 5 Test methods 5.1 Sampling Observe the general recommendations of ISO 3165 and take into account ISO 6206. Prepare the labo

42、ratory sample required by the relevant procedure described in ISO 8213. 5.2 Analyses 5.2.1 Main product Iron (II) sulfate is determined as Fe (II) content in the test sample by titrimetry with potassium dichromate solution (see B.1). 5.2.2 Impurities 5.2.2.1 Manganese The manganese content shall be

43、determined by flame atomic absorption spectrometry (FAAS) (see B.2). 5.2.2.2 Insoluble matters The percentage mass fraction of the insoluble matters shall be determined in accordance with the method described in B.3. 5.2.3 Chemical parameters 5.2.3.1 General The contents of chemical parameters shall

44、 be determined by atomic absorption spectrometry (AAS). 5.2.3.2 Preparation of sample solution 5.2.3.2.1 General Oxidation and wet digestion is used to bring the samples into a stable solution. 5.2.3.2.2 Principle Oxidation with hydrogen peroxide (H2O2)followed by digestion with hydrochloric acid (H

45、Cl). 5.2.3.2.3 Reagents All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 3 specified in EN ISO 3696. 5.2.3.2.3.1 Hydrochloric acid (HCl), solution, mass fraction 30 %. 5.2.3.2.3.2 Hydrogen peroxide (H2O2), solution, mass fraction 30 %. SANS 50889:2

46、008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 889:2004 (E) 10 5.2.3.2.4 Apparatus Ordinary laboratory apparatus and glassware together with the following 5.2.3.2.4.1 Analytical balance. 5.2.3.2.4.2 Graduated cylinder, capacity 50 ml.

47、5.2.3.2.4.3 Round flask with reflux condenser. 5.2.3.2.4.4 Hot plate. 5.2.3.2.4.5 Volumetric flask, capacity 200 ml. 5.2.3.2.5 Procedure Dissolve with 20 ml of water 20,0 g of the iron salt. Add to iron (II)-samples 30 ml hydrogen peroxide solution (5.2.3.2.3.2). After adding 50 ml hydrochloric acid

48、 (5.2.3.2.3.1) boil the solution for 15 min by using a reflux condenser (5.2.3.2.4.3). Cool down the solution, transfer to a 200 ml volumetric flask (5.2.3.2.4.5) and fill up to the mark with water. This is the sample solution. 5.2.3.3 Arsenic The arsenic content shall be determined by hydride gener

49、ation atomic absorption spectrometry (see B.4). 5.2.3.4 Cadmium The cadmium content shall be determined by graphite furnace atomic absorption spectrometry (see B.6). 5.2.3.5 Chromium The chromium content shall be determined by graphite furnace atomic absorption spectrometry (see B.6). 5.2.3.6 Mercury The mercury content shall be determined by cold vapour atomic absorption spectrometry (see B.5). 5.2.3.7 Nickel The nickel content shall be determined by graphite furnace atomic absorption spectrometry (see B.6). 5.2.3.8 Lead The lead content shall be determined