BS EN ISO 10101-1-1994 Natural gas - Determination of water by the Karl Fischer method - Introduction《天然气 卡尔费舍尔法测定水含量 简介》.pdf

1、BRITISH STANDARD BS EN ISO 10101-1:1998 BS 3156-11.3.1: 1994 Implementing Amendment No. 1 to BS3156-11.3.1:1994 ISO10101-1:1993 (renumbers the BS as BSENISO10101-1: 1998), not published separately Natural gas Determination of water by the Karl Fischer method Part 1: Introduction The European Standar

2、d EN ISO 10101-1:1998 has the status of a BritishStandard ICS 75.060BSEN 10101-1:1998 This British Standard, having been prepared under the directionof the Petroleum Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effecton 15 March 1994 BSI 05-1999 Th

3、e following BSI references relate to the work on this standard: Committee reference PTC/15 Draft for comment 92/527 10 DC ISBN 0 580 22955 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Petroleum Standards Policy Committee (PTC/-) to

4、Technical Committee PTC/15 upon which the following bodies were represented: British Compressed Gases Association British Gas plc Department of Trade and Industry (Gas and Oil Measurement Branch) Department of Trade and Industry (National Engineering Laboratory) Institute of Petroleum Amendments iss

5、ued since publication Amd. No. Date Comments 10051 July 1998 Implementation of EN ISO 10101-1:1998BSENISO 10101-1:1998 BSI 05-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Reactions and interferences

6、3 5 Sampling 4 Annex A (informative) Bibliography 5 Annex ZA (normative) Normative references to international publicationswiththeir relevant European publications 5 List of references Inside back coverBSEN ISO 10101-1:1998 ii BSI 05-1999 National foreword This British Standard has been prepared und

7、er the direction of the Petroleum Standards Policy Committee and is the English language version of ENISO10101-1:1998 Natural gas Determination of water by the Karl Fischer method Part1:Introduction published by the European Committee for Standardization (CEN). It is identical with ISO10101-1:1993 p

8、ublished by the International Organization for Standardization (ISO). International Standard ISO10101-1was prepared by Technical Committee ISO/TC193, Natural gas, Subcommittee SC1, Analysis of natural gas, in which the United Kingdom participated. ISO10101consists of the following Parts, under the g

9、eneral title Natural gas Determination of water by the Karl Fischer method. Part 1: Introduction; Part 2: Titration procedure; Part 3: Coulometric procedure. Annex A of this Subsection of BS3156is for information only. The Technical Committee has reviewed the provisions of ISO 6712:1982, to which no

10、rmative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance w

11、ith a British Standard does not of itself confer immunity from legal obligations. Cross-references International standard Corresponding British Standard BS 3156 Analysis of fuel gases Part 11 Method for non-manufactured gases Section 11.3 Determination of water in natural gas by the Karl Fischer met

12、hod ISO 10101-2:1993 Subsection 11.3.2:1994 Titration method (Identical) ISO 10101-3:1993 Subsection 11.3.3:1994 Coulometric method (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages 2 to 6, an inside back cover and

13、a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 10101-1 March 1998 ICS 75.060 Descriptors: See ISO document Eng

14、lish version Natural gas Determination of water by the Karl Fischer method Part 1: Introduction (ISO 10101-1:1993) Gaz naturel Dosage de leau par la mthodede Karl Fischer Partie1:Introduction (ISO 10101-1:1993) Erdgas Bestimmung des Wassergehaltesnach Karl Fischer Teil1:Einfhrung (ISO 10101-1:1993)

15、This European Standard was approved by CEN on 22 February 1998. 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 re

16、ferences 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

17、 into 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, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal

18、, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for C

19、EN national Members Ref. No. EN ISO 10101-1:1998 EENISO 10101-1:1998 BSI 05-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC 193, Natural gas, of the International Organization for Standardization (ISO) has been taken over as a European Standard by CEN/CS. This

20、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 September1998, and conflicting national Standards shall be withdrawn at the latest by September 1998. According to CEN/CENELEC Internal Regulations, the

21、following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the Int

22、ernational Standard ISO10101-1:1993 has been approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative).ISO10101-1:1993(E) BSI 05-1999 3 WARNING Local safety regulations must be taken into account, when the

23、equipment is located in hazardous areas. Due to the toxicity and odour of pyridine, the user should ensure that there is adequate ventilation. 1 Scope This part of ISO10101specifies general requirements for the determination of water in natural gas using the Karl Fischer method. ISO10101-2 and ISO10

24、101-3specify two individual methods of determination, a titration procedure and a coulometric procedure, respectively. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO10101. At the time of publication,

25、the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO10101 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of current

26、ly valid International Standards. ISO 6712:1982, Gas analysis Sampling and transfer equipment for gases supplying an analytical unit. ISO 10101-2:1993, Natural gas Determination of water by the Karl Fischer method Part2:Titration procedure. ISO 10101-3:1993, Natural gas Determination of water by the

27、 Karl Fischer method Part3:Coulometric procedure. 3 Principle Reaction of water present in the test sample with iodine and sulfur-dioxide in a pyridine/methanol mixture (Karl Fischer reagent). 3.1 Principle of the first method (ISO 10101-2) A measured volume of gas is passed through a cell containin

28、g a relatively small volume of absorbent solution. Water in the gas is dissolved in the absorbent solution and subsequently titrated with Karl Fischer reagent, the endpoint being detected voltametrically. 3.2 Principle of the second method (ISO 10101-3) A measured volume of gas is passed through a c

29、ell containing anhydrous, previously titrated, anodic solution. The iodine required for the titration of the dissolved water is coulometrically produced from the iodide present in the solution by the reaction 2I fF I 2+ 2e 4 Reactions and interferences CH 3 OH + SO 2+ R 3 N F R 3 NHSO 3 CH 3 H 2 O +

30、 I 2+ R 3 NHSO 3 CH 3+ 2R 3 N F R 3 NHSO 4 CH 3+ 2R 3 NHI NOTE 1Methanol may be replaced by2-methoxyethanol (ethylene glycol monomethylether) and pyridine (R 3 N) may be replaced by any other suitable basic nitrogen compound. Various gas components react with the Karl Fischer reagent and can give ri

31、se to erroneous results. Such components are oxidizing and reducing agents, e.g.hydrogen sulfide, mercaptans and certain basic nitrogeneous substances. Hydrogen sulfide and mercaptans are present in some natural gases. If their concentration is less than20% of the water content, interference due to

32、their presence shall be corrected as follows: where A(H 2 O) a is the actual water content, in milligrams per cubic meter at 273,15K (0C) and 101,325kPa (1atm); A(H 2 O) is the observed or measured water content, in milligrams per cubic meter at 273,15K (0C) and 101,325kPa (1atm); A(S as H 2 S) is t

33、he measured sulfur as hydrogen sulfide, in milligrams per cubic meter at 273,15K (0C) and 101,325kPa (1atm); A(S as RSH) is the measured sulfur as mercaptans in the gas, in milligrams per cubic meter at 273,15K (0C) and 101,325kPa (1atm).ISO10101-1:1993(E) 4 BSI 05-1999 At higher contents of H 2 S a

34、nd RSH this method is not applicable. NOTE 2The sulfur present as hydrogen sulfide and mercaptans can be determined by potentiometric titration (seeISO 6362-3) or by any other suitable method. 5 Sampling Carry out sampling according to the general sampling guidelines given in ISO6712. During samplin

35、g, ensure that the temperature of the gas stream is above the dew-point temperature. If necessary the sampling equipment should be heated. All parts in contact with the gas shall be of steel or glass. The ends of pipes shall fit securely together and the connecting pieces shall be made of fluoro-ela

36、stomers.ISO10101-1:1993(E) BSI 05-1999 5 Annex A (informative) Bibliography 1 ISO 760:1978, Determination of water Karl Fischer method (General method). 2 ISO 6326-3:1989, Natural gas Determination of sulfur compounds Part3:Determination of hydrogen sulfide, mercaptan sulfur and carbonyl sulfide sul

37、fur by potentiometry. 3 FISHER, K. Neues Verfahren zur mass-analytischen Bestimmung des Wassergehaltes von Flssigkeiten und festen Krpern. Angewandte Chemie 48 (1935), 26, p. 394. 4 KAESLER, H. Direkte Bestimmung des Wassergehaltes in Gasen nach Karl Fischer. gwf-gas erdgas 125 (1984), 3, pp. 125-13

38、1. 5 SCHOLZ, E. Karl Fischer Titration, Methoden zur Wasserbestimmung. Springer-verslag, Berlin, Heidelberg, 1984. Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, prov

39、isions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it

40、by amendment or revision. For undated references the latest edition of the publication referred to applies. Publication Year Title EN Year ISO 10101-2 1993 Natural gas Determination of water by the Karl Fischer method Part2:Titration procedure EN ISO 10101-2 1998 ISO 10101-3 1993 Natural gas Determi

41、nation of water by the Karl Fischer method Part3:Coulometric procedure EN ISO 10101-3 19986 blankBSENISO10101-1:1998 BSI 05-1999 List of references See national foreword.BS EN ISO 10101-1:1998 BS 3156-11.3.1: 1994 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the ind

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