1、Designation:D511098(Reapproved 2010)Standard Practice forCalibration of Ozone Monitors and Certification of OzoneTransfer Standards Using Ultraviolet Photometry1This standard is issued under the fixed designation D5110;the number immediately following the designation indicates the year oforiginal ad
2、option 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 practice covers a means for calibrating ambient,workplace,or indoor ozon
3、e monitors,and for certifyingtransfer standards to be used for that purpose.1.2 This practice describes means by which dynamicstreams of ozone in air can be designated as primary ozonestandards.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included
4、 in thisstandard.1.4 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.S
5、ee Section 8 forspecific precautionary statements.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3195 Practice for Rotameter CalibrationD3249 Practice for General Ambient Air Analyzer Proce-duresD3631 Test Methods for Measuring Surface Atm
6、osphericPressureD5011 Practices for Calibration of Ozone Monitors UsingTransfer StandardsE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE591 Practice for Safety and Health Requirements Relatingto Occupational Exposure to Ozone(Withdrawn 1990)3E644 Test Methods for Testing I
7、ndustrial Resistance Ther-mometers3.Terminology3.1 Definitions:For definitions of terms used in thispractice,refer to Terminology D1356.3.2 Definitions of Terms Specific to This Standard:3.2.1 primary standarda standard directly defined andestablished by some authority,against which all secondarysta
8、ndards are compared.3.2.2 secondary standarda standard used as a means ofcomparison,but checked against a primary standard.3.2.3 standardan accepted reference sample or deviceused for establishing measurement of a physical quantity.3.2.4 transfer standarda type of secondary standard.It isa transport
9、able device or apparatus that,together with opera-tional procedures,is capable of reproducing pollutant concen-tration or producing acceptable assays of pollutant concentra-tions.3.2.5 zero airpurified air that does not contain ozone,anddoes not contain any other component that may interfere withthe
10、 measurement(see 7.1).4.Summary of Practice4.1 This practice is based on the photometric assay of ozone(O3)concentrations in a dynamic flow system.The concentra-tion of O3in an absorption cell is determined from a measure-ment of the amount of 253.7 nm light absorbed by the sample.This determination
11、 requires knowledge of(1)4the absorptioncoefficient of O3at 253.7 nm,(2)the optical path lengththrough the sample,(3)the transmittance of the sample at awavelength of 253.7 nm,and(4)the temperature and pressureof the sample.The transmittance is defined as the ratio:I/Io1This practice is under the ju
12、risdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.03on AmbientAtmospheres and Source Emissions.Current edition approved Oct.1,2010.Published November 2010.Originallyapproved in 1990.Last previous edition approved in 2004 as D5110-98(2004).DOI:10.1520
13、/D5110-98R10.2For 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.3The last approved version of this historical standar
14、d is referenced onwww.astm.org.4The boldface numbers in parentheses refer to the references listed at the end ofthis practice.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 where:I=the intensity of light that passes through the cell and
15、issensed by the detector when the cell contains an O3sample,andIo=the intensity of light that passes through the cell and issensed by the detector when the cell contains zero air.It is assumed that all conditions of the system,except for thecontents of the absorption cell,are identical during measur
16、e-ments of I and Io.The quantities defined above are related bythe Beer-Lambert absorption law:Transmittance5 I/Io5 e2acd(1)where:a=absorptioncoefficientofO3at253.7nm,(308 6 4)106ppm1cm1at 0C and 101.3 kPa(1atm)(1,2,3,4,5,6,7,8)c=O3concentration,ppm,andd=optical path length,cm.4.1.1 In practice,a stable O3generator(see 6.1.4)is used toproduce O3concentrations over the required range.Each O3concentration is determined from the measurement of thetransmittance of the sample at 253.7 nm,and is calcu