08-30175672-DC.pdf

a Date: 4 September 2008 Origin: European Latest date for receipt of comments: 31 December 2008 Project no.: 2007/03499 Responsible committee: EH/2/3 Ambient atmospheres Interested committees: EH/2 Title: Draft BS EN 15852 Ambient air quality - Standard method for the determination of total gaseous mercury Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 31 December 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email cservicesbsigroup.com. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsigroup.com. Direct tel: 020 8996 7186 Responsible Committee Secretary: Dr R A Wellings (BSI) E-mail: roger.wellingsbsigroup.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 08/30175672 DC Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, then the UK will approve this draft and implement it as a British Standard. Comment is particularly welcome on national, legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version 6.0 or Version 97 of Microsoft® Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. 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Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM DRAFT prEN 15852 August 2008 ICS English Version Ambient air quality - Standard method for the determination of total gaseous mercury Außenluftbeschaffenheit - Standardisiertes Verfahren zur Bestimmung des gesamten gasförmigen Quecksilbers This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 264. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels © 2008 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 15852:2008: E Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI prEN 15852:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references4 3 Terms and definitions .4 4 Symbols and abbreviated terms 7 5 Principle10 6 Requirements.10 7 Reagents.11 8 Apparatus .12 9 Sampling considerations13 10 Measurement procedure.14 11 Quality control16 12 Calculation of results 17 13 Estimation of the measurement uncertainty method and performance criteria.19 14 Performance characteristics determined in field tests22 15 Interferences 23 16 Reporting of results.24 Annex A (informative) Sampling sites.25 Annex B (informative) Manual method TGM.26 Annex C (informative) Summary field validation tests28 Annex D (informative) Characteristics of the mercury vapour source33 Annex E (informative) Calibration36 Annex F (informative) Assessment against target uncertainty by an individual laboratory.37 Annex ZA (informative) Relationship between this European Standard and the essential requirements of EU Directives .40 Bibliography41 Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI prEN 15852:2008 (E) 3 Foreword This document (prEN 15852:2008) has been prepared by Technical Committee CEN/TC 264 “Air quality”, the secretariat of which is held by DIN. This document is currently submitted to the CEN Enquiry. Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI prEN 15852:2008 (E) 4 1 Scope This European Standard describes a standard method for determining total gaseous mercury (TGM) in ambient air using cold vapour atomic absorption spectrometry (CVAAS), cold vapour atomic fluorescence spectrometry (CVAFS) or Zeeman atomic absorption spectrometry (Zeeman AAS). This European Standard is applicable to background sites that are in accordance with the requirements of Directive 2004/107/EC and to urban and industrial sites. The performance characteristics of the method have been determined in comparative field validation tests carried out at four European locations: two background and two industrial sites. The method was tested for 2 months at each site over a period of 12 months using automated equipment currently used in Europe for determination of TGM in ambient air. The working range of the method covers the range of ambient air concentrations from those found at background sites, typically less than 2 ng/m³, up to those found at industrial sites where higher concentrations are expected. A maximum daily average up to 300 ng/m3 was measured during the field trials. Results are reported as the average mass of TGM per volume of air at 293 K and 101,325 kPa, measured over a specified time period, in ng/m3. 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 referenced document (including any amendments) applies. ISO 5725, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of the trueness of a standard measurement method ISO 8573-1, Compressed air Part 1: Contaminants and purity classes ENV 13005, Guide to the expression of uncertainty in measurement CR 14377, Air quality Approach to uncertainty estimation for ambient air reference measurement methods EN ISO 20988, Air quality Guidelines for estimating measurement uncertainty 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ambient air outdoor air in the troposphere, excluding workplace air 96/62/EC 3.2 calibration operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication ISO/IEC Guide 99 (VIM) Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI prEN 15852:2008 (E) 5 3.3 combined standard measurement uncertainty standard measurement uncertainty that is obtained using the individual standard measurement uncertainties associated with the input quantities in a measurement model ISO/IEC Guide 99 (VIM) 3.4 coverage factor number larger than one by which a combined standard measurement uncertainty is multiplied to obtain an expanded measurement uncertainty ISO/IEC Guide 99 (VIM) 3.5 detection limit measured quantity value, obtained by a given measurement procedure, for which the probability of falsely claiming the absence of a component in a material is , given a probability of falsely claiming its presence NOTE IUPAC recommends default values for and equal to 0,05. ISO/IEC Guide 99 (VIM) 3.6 expanded standard measurement uncertainty product of a combined standard measurement uncertainty and a factor larger than the number one NOTE 1 The factor depends upon the type of probability distribution of the output quantity in a measurement model and on the selected coverage probability. NOTE 2 The term “factor” in this definition refers to a coverage factor. NOTE 3 Expanded measurement uncertainty is termed “overall uncertainty” in paragraph 5 of Recommendation INC-1 (1980) (see the GUM) and simply “uncertainty” in IEC documents. ISO/IEC Guide 99 (VIM) NOTE 4 For the purpose of this document the expanded uncertainty is the combined standard uncertainty multiplied by a coverage factor k = 2 resulting in an interval with a level of confidence of 95 %. 3.7 measurement repeatability measurement precision under a set of repeatability conditions of measurement ISO/IEC Guide 99 (VIM) 3.8 measurement reproducibility measurement precision under reproducibility conditions of measurement ISO/IEC Guide 99 (VIM) 3.9 measurement time length of time over which the measurement instrumentation produces a single concentration value, during normal operation NOTE 1 For trap and desorb instruments this will be time period air is sampled across the adsorption tube prior to each thermal desorption cycle analysis; for direct measurement instruments this will be the time period over which the absorbance is averaged to produce a single value. NOTE 2 Measurement times during the field trial campaign ranged from 30 seconds to 30 minutes. 3.10 measurement uncertainty non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used NOTE 1 Measurement uncertainty includes components arising from systematic effects, such as components associated with corrections and the assigned quantity values of measurement standards, as well as the definitional uncertainty. Sometimes estimated systematic effects are not corrected for but, instead, associated measurement uncertainty components are incorporated. Licensed CopyChinese University of Hong Kong, 21/10/2008 07:58, Uncontrolled Copy, (c) BSI prEN 15852:2008 (E) 6 NOTE 2 The parameter may be, for example, a standard deviation called standard measurement uncertainty (or a specified multiple of it), or the half-width of an interval, having a stated coverage probability. ISO/IEC Guide 99 (VIM) 3.11 method detection limit lowest amount of an analyte that is detectable using the method, as determined by analysis of zero air 3.12 monitoring station (for mercury) enclosure located in the field in which an analyser has been installed to monitor TGM concentrations 3.13 quantification limit lowest amount of an analyte that is quantifiable with a given confidence level using the method, as determined by analysis of zero air 3.14 reference conditions ambient temperature of 293 K and a pressure of 101,325 kPa 3.15 repeatability condition of measurement condition of measurement, out of a set of conditions that includes the same measurement procedure, same operators, same measuring system, same operating conditions and same location, and replicate measurements on the same or similar objects over a short p