1、Designation:D291415Standard Test Methods forSulfur Dioxide Content of the Atmosphere(West-GaekeMethod)1This standard is issued under the fixed designation D2914;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisio
2、n.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the bubbler collection an
3、dcolorimetric determination of sulfur dioxide(SO2)in theambient or workplace atmosphere.1.2 These test methods are applicable for determining SO2over the range from approximately 25 g/m3(0.01 ppm(v)to1000 g/m3(0.4 ppm(v),corresponding to a solution concen-tration of 0.03 g SO2/mL to 1.3 g SO2/mL.Bee
4、rs law isfollowed through the working analytical range from 0.02 gSO2/mL to 1.4 g SO2/mL.1.3 The lower limit of detection is 0.075 g SO2/mL(1),2representing an air concentration of 25 g SO2/m3(0.01ppm(v)in a 30min sample,or 13 g SO2/m3(0.005 ppm(v)in a 24h sample.1.4 These test methods incorporate s
5、ampling for periodsbetween 30 min and 24 h.1.5 These test methods describe the determination of thecollected(impinged)samples.AMethodAand a Method B aredescribed.1.6 Method A is preferred over Method B,as it gives thehigher sensitivity,but it has a higher blank.Manual Method Bis pH-dependent,but is
6、more suitable with spectrometershaving a spectral band width greater than 20 nm.NOTE1These test methods are applicable at concentrations below 25g/m3by sampling larger volumes of air if the absorption efficiency of theparticular system is first determined,as described in Annex A4.NOTE2Concentrations
7、 higher than 1000 g/m3can be determined byusing smaller gas volumes,larger collection volumes,or by suitabledilution of the collected sample with absorbing solution prior to analysis.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thissta
8、ndard.1.8 WarningMercury has been designated by many regu-latory agencies as a hazardous material that can cause seriousmedical issues.Mercury,or its vapor,has been demonstrated tobe hazardous to health and corrosive to materials.Cautionshould be taken when handling mercury and mercury contain-ing p
9、roducts.See the applicable product Safety Data Sheet(SDS)for additional information.Users should be aware thatselling mercury and/or mercury containing products into yourstate or country may be prohibited by law.1.9 This standard does not purport to address all of thesafety concerns,if any,associate
10、d 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.For specificprecautionary statements,see 8.3.1,Section 9,and A3.1.3.2.Referenced Documents2.1 ASTM Standar
11、ds:3D1193 Specification for Reagent WaterD1356 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 AtmospheresD3195 Practice for Rotameter Calib
12、rationD3609 Practice for Calibration Techniques Using Perme-ation TubesD3631 Test Methods for Measuring Surface AtmosphericPressureE1 Specification for ASTM Liquid-in-Glass ThermometersE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision LiquidsE275 Practice for Descr
13、ibing and Measuring Performance ofUltraviolet and Visible Spectrophotometers1These test methods are under the jurisdiction of ASTM Committee D22 on AirQuality and are the direct responsibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved July 1,2015.Publ
14、ished July 2015.Originally approvedin 1970.Last previous edition approved in 2007 as D2914 01(2007).DOI:10.1520/D2914-15.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cus
15、tomer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.2 Other Standards:40 CFR Part 58Probe a
16、nd Monitoring Path Siting Criteriafrom Ambient Air Quality Monitoring,Appendix E43.Terminology3.1 For definitions of terms used in this method,refer toTerminology D1356.4.Summary of Test Methods4.1 Sulfur dioxide(SO2)is absorbed by aspirating a mea-sured air sample through a tetrachloromercurate(TCM)solution,resulting in the formation of a dichlorosulfonatomer-curate complex(2,3).Ethylenediaminetetraacetic acid diso-dium salt(EDTA)is added to this solution to complex heavymetalsthatinterferewith
