EN ISO 7393-2-2018 en Water quality - Determination of free chlorine and total chlorine - Part 2 Colorimetric method using N N-dialkyl- 1 4-phenylenediamine for routine control pur.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Water quality - Determination of free chlorine and total chlorinePart 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposesBS EN ISO 7393-2:2018Incorporating corrigendum May 2018EUR

2、OPEANSTANDARDNORME EUROPENNE EUROPISCHE NORMENISO7393-2January 2018ICS 13.060.50 Supersedes EN ISO 7393-2:2000EnglishVersionWater quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-2

3、:2017)Qualit de leau - Dosage du chlore libre etdu chlore total - Partie 2: Mthode colorimtrique la N,N-dithylphnylne-1,4 diamine destine aux contrlesde routine (ISO7393-2:2017)Wasserbeschaffenheit - Bestimmung von freiem Chlorund Gesamtchlor - Teil2: Kolorimetrisches Verfahrenmit N,N-Diethyl-1,4-Ph

4、enylendiamin frRoutinekontrollen (ISO 7393-2:2017)This European Standard was approved by CEN on 9 December2017.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thisEuropean Standard the status of a national standard without any alter

5、ation.Up-to-date lists and bibliographical referencesconcerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made b

6、ytranslation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC ManagementCentre has the same status as the officialversions.CEN members are the nationalstandards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finl

7、and, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.EUROPEAN COMMITTEE FOR STANDA

8、RDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reservedworldwide for CENnational Members.Ref. No. EN ISO 7393-2:2018 ENational forewordThis Brit

9、ish Standard is the UK implementation of EN ISO 7393-2:2018. It is identical to ISO 7393-2:2017. It supersedes BS EN ISO 7393-2:2000, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EH/3/2, Physical chemical and biochemical methods.A list of organizati

10、ons represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN

11、 978 0 580 85377 7ICS 13.060.50Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2018.Amendments/corrigenda issued since publicationDate Text affected31 May

12、 2018 Implementation of CEN correction notice 14 February 2018: reference to EN ISO 7393-2:2017 changed to EN ISO 7393-2:2018 in European ForewordBRITISH STANDARDBS EN ISO 7393-2:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7393-2 January 2018 ICS 13.060.50 Supersedes EN ISO 7393-2:2

13、000English Version Water quality - Determination of free chlorine and total chlorine - Part 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control purposes (ISO 7393-2:2017) Qualit de leau - Dosage du chlore libre et du chlore total - Partie 2: Mthode colorimtrique la N,N

14、-dithylphnylne-1,4 diamine destine aux contrles de routine (ISO 7393-2:2017) Wasserbeschaffenheit - Bestimmung von freiem Chlor und Gesamtchlor - Teil 2: Kolorimetrisches Verfahren mit N,N-Diethyl-1,4-Phenylendiamin fr Routinekontrollen (ISO 7393-2:2017) This European Standard was approved by CEN on

15、 9 December 2017. 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 ma

16、y be obtained on application to the CEN-CENELEC Management Centre 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

17、to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland

18、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC

19、Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7393-2:2018 EBS EN ISO 7393-2:2018EN ISO 7393-2:2018 (E) 3 European foreword This document (EN ISO 7393-2:2018) has b

20、een prepared by Technical Committee ISO/TC 147 “ Water quality“ in collaboration with Technical Committee CEN/TC 230 “Water analysis”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by en

21、dorsement, at the latest by July 2018, and conflicting national standards shall be withdrawn at the latest by July 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all

22、such patent rights. This document supersedes EN ISO 7393-2:2000. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following c

23、ountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

24、 Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7393-2:2017 has been approved by CEN as EN ISO 7393-2:2018 without any modification. BS EN ISO 7393-2:2018ISO 7393-2:2017(E)Foreword iv1 Scope . 12 No

25、rmative references 13 Terms and definitions . 24 Principle 24.1 Determination of free chlorine 24.2 Determination of total chlorine 35 Interferences 35.1 General . 35.2 lnterference by other chlorine compounds 35.3 lnterference by compounds other than chlorine compounds 35.4 Interference due to the

26、presence of oxidized manganese . 35.5 Interference due to turbid and coloured samples 46 Reagents 47 Apparatus . 68 Sampling 79 Procedure. 79.1 Test sample . 79.2 Test portions . 79.3 Calibration 79.4 Determination of free chlorine 79.5 Determination of total chlorine 810 Calculation 910.1 Calculati

27、on of the free chlorine concentration 910.2 Calculation of the total chlorine concentration 910.3 Conversion of amount of substance concentration to mass concentration . 911 Expression of results 912 Test report . 9Annex A (informative) Separate determinations of combined chlorine of the monochloram

28、ine type, combined chlorine of the dichloramine type and of combined chlorine in the form of nitrogen trichloride 11Annex B (informative) Performance data 14Annex C (informative) Disposable planar reagent-filled cuvettes using a mesofluidic channel pump/colorimeter 17Bibliography .19 ISO 2017 All ri

29、ghts reserved iiiContents PageBS EN ISO 7393-2:2018ISO 7393-2:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technica

30、l committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely wit

31、h the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed f

32、or the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent right

33、s. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this

34、document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trad

35、e Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 147, Water quality, Subcommittee SC 2, Physical, chemical and biochemical methods.This second edition cancels and rep

36、laces the first edition (ISO 7393-2:1985), which has been technically revised.The main changes compared to the previous edition are as follows: a new Annex C has been included with the title: Disposable planar reagent-filled cuvettes using a mesofluidic channel pump/colorimeter.A list of all parts i

37、n the ISO 7393 series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 7393-2:2018INTERNATIONAL STANDARD ISO 7393-2:2017(E)Water quality Determination of free chlorine and total chlorine Part 2: Colorimetric method using N,N-dialkyl-1,4-phenylenediamine, for routine control p

38、urposesWARNING Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices.IMPORTANT It

39、 is essential that tests conducted in accordance with this document be carried out by suitably qualified staff.1 ScopeThis document specifies a method for the determination of free chlorine and total chlorine in water, readily applicable to lab- and field-testing. It is based on measurement of the a

40、bsorption, the red DPD colour complex in a photometer or the colour intensity by visual comparison of the colour with a scale of standards that is regularly calibrated.This method is appropriate for drinking water and other waters, where additional halogens like bromine, iodine and other oxidizing a

41、gents are present in almost negligible amounts. Seawater and waters containing bromides and iodides comprise a group for which special procedures are to be carried out.This method is in practice applicable to concentrations, in terms of chlorine (Cl2), from, for example, 0,000 4 mmol/l to 0,07 mmol/

42、l (e.g. 0,03 mg/l to 5 mg/l) total chlorine. For higher concentrations, the test portion is diluted.Commonly, the method is applied as a field method with mobile photometers and commercially available ready-for-use reagents (liquid reagents, powders and tablets). It is essential that those reagents

43、comply with minimum requirements and contain the essential reagents and a buffer system suitable to adjust the measurement solution to a pH range of typically 6,2 to 6,5. If there is doubt that water samples have uncommon pH values and/or buffer capacities, the user has to check and, if necessary, t

44、o adjust the sample pH to the required range. The pH of the sample is within the range of pH 4 and 8. Adjust, if necessary, with sodium hydroxide solution or sulfuric acid before the test.A procedure for the differentiation of combined chlorine of the monochloramine type, combined chlorine of the di

45、chloramine type and combined chlorine in the form of nitrogen trichloride is presented in Annex A. In Annex C, a procedure is presented for the determination of free and total chlorine in drinking and other low polluted waters, for disposable planar reagent-filled cuvettes using a mesofluidic channe

46、l pump/colorimeter.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced d

47、ocument (including any amendments) applies.ISO 3696, Water for analytical laboratory use Specification and test methodsISO 5667-3, Water quality Sampling Part 3: Preservation and handling of water samples ISO 2017 All rights reserved 1BS EN ISO 7393-2:2018ISO 7393-2:2017(E)ISO 8466-1, Water quality

48、Calibration and evaluation of analytical methods and estimation of performance characteristics Part 1: Statistical evaluation of the linear calibration function3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological data

49、bases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at https:/www.iso.org/obp3.1free chlorinechlorine present in the form of hypochlorous acid, hypochlorite ion or dissolved elemental chlorineNote 1 to entry: See Table 1.3.2combined chlorinebound chlorinefraction of total chlorine (3.3) present in the form of chloramines (3.4) and organic chloraminesNote 1 to entry: See Table 1.3.3total chlorinechlorine present in