ASTM_D_5156_-_02_2008.pdf

Designation:D515602(Reapproved 2008)Standard Test Methods forContinuous Measurement of Ozone in Ambient,Workplace,and Indoor Atmospheres(Ultraviolet Absorption)1This standard is issued under the fixed designation D5156;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes the sampling and continuousanalysis of ozone(O3)in the atmosphere at concentrationsranging from 10 to 2000 g/m3of O3in air(5 ppb(v)to 1ppm(v).1.1.1 The test method is limited to applications by itssensitivity to interferences as described in Section 6.Theinterference sensitivities may limit its use for ambient andworkplace atmospheres.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD1914 Practice for Conversion Units and Factors Relating toSampling and Analysis of AtmospheresD3249 Practice for General Ambient Air Analyzer Proce-duresD3631 Test Methods for Measuring Surface AtmosphericPressureD3670 Guide for Determination of Precision and Bias ofMethods of Committee D22D5011 Practices for Calibration of Ozone Monitors UsingTransfer StandardsD5110 Practice for Calibration of Ozone Monitors andCertification of Ozone Transfer Standards Using Ultravio-let PhotometryIEEE/ASTM SI-10 Practice for Use of the InternationalSystem of Units(SI)(the Modernized Metric System)2.2 Other Documents:EPA-600/4-76-005 Quality Assurance Handbook for AirPollution Measurement Systems,Vol I,“Principles”3EPA-600/4-77-027a Quality Assurance Handbook for AirPollution Measurement Systems,Vol II,“Ambient AirSpecific Methods”33.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1356.An explanation of units,symbols,and conversion factors may be found in PracticeIEEE/ASTM SI-10.3.2 Definitions of Terms Specific to This Standard:3.2.1 absolute ultraviolet photometera photometer whosedesign,construction,and maintenance is such that it canmeasure the absorbance caused by O3mixtures without refer-ence to external absorption standards.Given a value for theabsorption coefficient of O3at 253.7 nm and a reading from theabsolute ultraviolet photometer,O3concentrations can becalculated with accuracy.An absolute ultraviolet photometer isused only on prepared O3mixtures free from interferences,asin calibration activity.3.2.2 primary standarda standard directly defined andestablished by some authority,against which all secondarystandards are compared.3.2.3 secondary standarda standard used as a means ofcomparison,but checked against a primary standard.3.2.4 standardan accepted reference sample or deviceused for establishing the measurement of a physical quantity.3.2.5 transfer standarda type of secondary standard;it isa transportable device or apparatus that,together with opera-tional procedures,is capable of reproducing pollutant concen-trations or producing acceptable assays of pollutant concentra-tions.1These test methods are under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved April 1,2008.Published July 2008.Originallyapproved in 1991.Last previous edition approved in 2002 as D5156 02.DOI:10.1520/D5156-02R08.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from National Technical Information Service(NTIS),5301 ShawneeRd.,Alexandria,VA 22312,http:/www.ntis.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Summary of Test Method4.1 This test method is based on the absorption of ultravioletradiation at 253.7-nm wavelength by O3and the use of anozone-specific scrubber to generate a reference air stream withonly O3scrubbed from it.A single-cell ultraviolet absorptionphotometer is used,with the cell filled alternately with ambientand O3-scrubbed ambient air.The absorption to be measured atthe lower part of the operating range is extremely small.Special precautions and designs must be used to obtainaccurate results.4.2 The absorption of radiation at 253.7 nm by O3at verylow concentrations follows the Beer-Lambert Law.Name