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1、BRITISH STANDARD BS EN838:1996Workplace atmospheres Diffusive samplers for the determination of gases and vapours Requirements and test methodsThe European Standard EN 838:1995 has the status of aBritish StandardICS 13.040.30BS EN 838:1996Committees responsible for thisBritish StandardThe preparatio
2、n of this British Standard was entrusted to Technical Committee EH/2, Air quality, upon which the following bodies were represented:AEA TechnologyAsbestos Information Centre Ltd. Asbestosis Research Council Association of Consulting Scientists British Cement AssociationBritish Coal CorporationCharte
3、red Institute of Environmental Health Combustion Engineering Association Department of HealthDepartment of the Environment Her Majestys Inspectorate of PollutionDepartment of Trade and Industry Laboratory of the Government ChemistEngineering Equipment and Materials Users AssociationEuropean Resin Ma
4、nufacturers AssociationGAMBICA (BEAMA Ltd.) Health and Safety Executive Institute of Petroleum National Society for Clean Air Royal Society of Chemistry TES-BRETBY Ltd.The following bodies were also represented in the drafting of the standard, through subcommittees and panels:Asbestos Information Ce
5、ntre Ltd. Asbestosis Research Council BCIRABritish Ceramic Research Ltd.British Gas PlcBritish Occupational Hygiene SocietyChemical Industries AssociationDepartment of Trade and Industry Laboratory of the Government ChemistEmployers Association of Catering Equipment Engineers Ltd. Engineering Equipm
6、ent and Materials Users Association Fibre Cement Manufacturers Association LimitedHealth and Safety ExecutiveInstitute of EnergyInstitute of Occupational Hygienists Institute of Occupational Medicine London TransportRoyal Society of ChemistryThis British Standard, having been prepared under the dire
7、ction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comesinto effect on15 September 1996 BSI 04-2000The following BSI references relate to the work on this standard:Committee reference EH/2Draft for comment 92/56577 DCISBN 0 580 26240 5Amd.
8、No.DateCommentsAmendments issued since publicationBS EN 838:1996ContentsPage Committees responsibleInside front cover National forewordii Foreword 2Text of EN 8383List of referencesInside back cover BSI 04-2000iBS EN 838:1996National forewordThis British Standard has been prepared by Technical Commi
9、ttee EH/2 and is the English language version of EN 838:1995 Workplace atmospheres Diffusive samplers for the determination of gases and vapours Requirements and test methods published by the European Committee for Standardization (CEN). The European Standard was prepared by Technical Committee 137,
10、 Assessment of workplace exposure, of CEN with the active participation and approval of the UK.Cross-referencesPublication referred toCorresponding British StandardEN 482:1994BS EN 482:1994Workplace atmospheres General requirements for the performance of procedures for the measurement ofchemical age
11、ntsA 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 with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises
12、a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 24, an inside back cover and 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. BSI 04-
13、2000iiEUROPEAN STANDARD NORME EUROPENNEEUROPISCHE NORMEN 838November 1995ICS 13.040.30Descriptors: Air, quality, air pollution, workroom, gas analysis, gases, concentration, samplers, diffusion, characteristics, tests, effectiveness, desorptionEnglish versionWorkplace atmospheres Diffusive samplers
14、for the determination of gases and vapours Requirements and test methodsAtmosphres des lieux de travail Echantillonneurs par diffusion pour la dtermination des gaz et vapeurs Prescriptions et mthodes dessaiLuftbeschaffenheit am Arbeitsplatz Diffusionssammler fr Gase und Dmpfe Anforderungen und Prfun
15、gThis European Standard was approved by CEN on 1995-07-14. 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 referenc
16、es concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.The 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 it
17、s 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzer
18、land and United Kingdom.CENEuropean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and
19、its members.Ref. No. EN 838:1995 EEN 838:199521 BSI 04-2000ForewordTable A.1 Analysis of variance (twoPageThis European Standard has been prepared by theTechnical Committee CEN/TC 137, Assessment of workplace exposure, the secretariat of which is heldby DIN.This European Standard shall be given the
20、status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1996, and conflicting national standards shall be withdrawn at the latest by May 1996.According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement th
21、is European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United KingdomContentsPageForeword20Introduction31Scope32Normative references33Definitions 44Symbols and abbreviat
22、ions45Requirements46General test conditions57Test methods78Levels of evaluation119Test report1210Marking 12Annex A (normative) Analysis ofexperimental data (two-factor experiment)13Annex B (informative) Fundamentals ofdiffusive sampling17Annex C (informative) Field tests Paired comparisons17Annex D
23、(informative) Field tests Multiple comparisons18Annex E (normative) Environmentalinfluences Multifactor test 19Annex F (normative) Computationalanalysis of fractional factor data20Annex G (informative) Bibliography23Figure 1 Typical relationship between air velocity and observed concentrationfor dif
24、fusive samplers10Figure 210factors with replication) Data matrix 14Table A.2 Analysis of variance Calculation of mean squares14Table A.3 Analysis of experimentaldata (1) Results 15Table A.4 Analysis of experimentaldata (1) Analysis of variance15Table A.5 Analysis of experimentaldata (1) Calculation
25、of overall uncertainty15Table A.6 Analysis of experimentaldata (2) Analysis of variance15Table A.7 Analysis of experimentaldata (2) Calculation of overall uncertainty16Table A.8 Analysis of experimentaldata (3) Results 16Table A.9 Analysis of experimentaldata (3) Analysis of variance16Table A.10 Ana
26、lysis of experimentaldata (3) Calculation of overall uncertainty16Table F.1 Sixteen-run fractional factor example Data from an SO2 diffusivesampler220 IntroductionCEN/TC 137, Assessment of workplace exposure, has proposed general performance criteria that methods of determining the concentration of
27、chemical agents in workplace atmospheres should meet (see EN 482). These performance criteria include maximum values of overall uncertainty (a combination of precision and bias) achievable under prescribed laboratory conditions for the methods to be used. In addition, the performance criteria should
28、 also be met under a wider variety of environmental influences, representative of workplace conditions.1 Scope1.1 GeneralThis European Standard specifies performance requirements and test methods under prescribed laboratory conditions for a diffusive sampler used for the determination of gases or va
29、pours in workplace atmospheres.Additional tests designed to establish whether the performance characteristics of the diffusive sampler are affected by the wider range of environmental influences that may be encountered in field use are described in Annex C and Annex D.If there is no diffusive sample
30、r for measuring a particular chemical agent which meets the requirements of this European Standard, it is recommended to use a diffusive sampler whose performance is nearest to the specified requirements.1.2 Field of applicationThe European Standard is applicable to: type A samplers: diffusive sampl
31、ers which are used for the direct determination of concentrations, for example, length-of-stain detector tubes; type B samplers: diffusive samplers which are used for the indirect determination of concentration by sampling and analysis in separate stages.Type B samplers may be further divided into:
32、type B 1 samplers: diffusive samplers which rely on sorption onto a solid, desorption with solvent, and subsequent analysis of the desorbate; type B 2 samplers: diffusive samplers which rely on sorption onto a solid, desorption by heat, and analysis of the desorbate; type B 3 samplers: diffusive sam
33、plers which rely on sorption into a liquid, and subsequent analysis of the solution.Specific aspects of the use of reagent impregnated systems will be covered in additional Parts of this standard.1.3 Object of standardThis European Standard should enable manufacturers and users of diffusive samplers
34、 to adopt a consistent approach to sampler validation and provide a framework for the assessment of sampler performance against criteria specifiedin EN 482. It is the responsibility of themanufacturer or of those who assemble the diffusive samplers to ensure that the sampler complies with the overal
35、l uncertainty requirements under the specified laboratory conditions given in this European Standard including such environmentalinfluences, (e.g. temperature and humidity) thatmay be expected to affect performance.No useful performance requirements can be given for the effect of interferents (with
36、the exception of water vapour). However, the user of diffusive samplers should be cautioned that interferences may occur especially for type A samplers. Such information shall be included in the instructions for use.If it is known in advance that a certain type of diffusive sampler is unaffected by
37、an environmental influence, then the relevant tests in 7.7 to 7.9, or the equivalent in Annex E shall be modified to examine only the factors likely to have an influence.NOTE 1 Annex C and Annex D relating to field tests are not obligatory as part of this European Standard but are directed primarily
38、 to the users of such devices, who are in the best position to know the specific factors that may significantly affect sampler performance.NOTE 2 Because of the known effect of pressure on diffusion coefficients, a pressure test is not necessary.2 Normative referencesThis European Standard incorpora
39、tes by dated or undated reference, provisions 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
40、 Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.EN 482, Workplace atmospheres General requirements for the performance of procedures for the measurement of chemical agents.3 DefinitionsFor the purposes
41、of this standard, the following definitions apply.3.1bias, limit value, measuring procedure, overall uncertainty, precision, true value, validationDefinitions for these terms are as in EN 482.3.2desorption efficiencythe ratio of the mass of analyte desorbed from a sampling device to that applied3.3d
42、iffusive samplera device which is capable of taking samples of gases or vapours from the atmosphere at a rate controlled by a physical process such as gaseous diffusion through a static air layer or permeation through a membrane, but which does not involve the active movement of air through the samp
43、ler3.4diffusive uptake ratethe rate at which the diffusive sampler collects a particular gas or vapour from the atmosphere,mbthe mass of the analyte which is desorbed from the blank sampler, in nanograms;mdthe mass of the analyte which is desorbed, in nanograms;msthe mass of the analyte which is sor
44、bed by diffusion, in nanograms;m1the mass loss from permeation tube, in milligrams per minute;m2the mean observed exposure dose (type A samplers) or mean mass uptake (type B samplers) of samplers exposed to a 30 min pulse (see 7.2.2);m3the mean observed exposure dose (type A samplers) or mean mass u
45、ptake (type B samplers) of samplers exposed to a 30 min pulse plus 7,5 h of clean air (see 7.2.2);M the molar mass of analyte, in grams per mol;pthe actual pressure of the atmosphere sampled, in kilopascals;t the exposure time, in minutes;Tthe temperature of the atmosphere sampled, in kelvin;U the diffusive uptake rate, in cubic centimetres per minute;U1 the diffusive uptake of analyte 1;expressed in nanograms per parts per million U(volume/volume) per minute (ngppm1 (V/V) min1) 2the diffusive uptake of analyte 2;or cubic centimetres per minute (cm3min1)3.5
