1、Designation:D326891(Reapproved 2018)Standard Test Method forSeparation and Collection of Particulate and GaseousFluorides in the Atmosphere(Sodium Bicarbonate-CoatedGlass Tube and Particulate Filter Method)1This standard is issued under the fixed designation D3268;the number immediately following th
2、e 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.This standard has been approved for use by
3、 agencies of the U.S.Department of Defense.1.Scope1.1 The sodium bicarbonate-coated glass tube and mem-brane filter method provides a means for the separation andcollection of gaseous atmospheric forms of fluoride reactivewith sodium bicarbonate and particulate forms of fluoridewhich are collected b
4、y a filter.The test method is applicable to12-h sampling periods,collecting 1 to 500 g of gaseousfluoride at a 15 L/min(0.5 ft3/min)sampling rate or about 0.1to 50 g/m3.The length of the sampling period can therefore beadjusted so that the amount of fluoride collected will fall withinthis range.The
5、actual lower limit of the test method willdepend upon the sensitivity of the analytical method employedand the quality of reagents used in tube preparation andanalysis.It is recommended that the lower limit of detectionshould be considered as two times the standard deviation of themonthly arithmetic
6、 mean blank value.Any values greater thanthe blank by less than this amount should be reported as“blankvalue.”1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and ar
7、e not considered standard.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,health,and environmental practices and deter-mine the applicability of regulatory lim
8、itations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization
9、 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD3266 Test Method for Automated Separation and Co
10、llec-tion of Particulate and Acidic Gaseous Fluoride in theAtmosphere(Double Paper Tape Sampler Method)D3267 Test Method for Separation and Collection of Par-ticulate and Water-Soluble Gaseous Fluorides in the At-mosphere(Filter and Impinger Method)D3269 Test Methods for Analysis for Fluoride Conten
11、t ofthe Atmosphere and Plant Tissues(Manual Procedures)(Withdrawn 2010)3D3270 Test Methods for Analysis for Fluoride Content ofthe Atmosphere and Plant Tissues(SemiautomatedMethod)3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D1356.4.Summary of Tes
12、t Method4.1 Gaseous fluorides are removed from the air stream byreaction with sodium bicarbonate coated on the inside wall ofa borosilicate glass tube(Note 1).Particulate fluorides arecollected on a filter following the tube.The fluoride collectedby the tube is eluted with water or buffer and analyz
13、ed forfluoride.The particulate matter collected by the filter is eluted1This test method is 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 15,2018.Published M
14、ay 2018.Originallyapproved in 1973.Last previous edition approved in 2011 as D3268 91(2011).DOI:10.1520/D3268-91R18.2For 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 s
15、tandards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance wi
16、th internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 with acid and analyzed for fluoride(1-4).4The results arereported as g/m3of gaseous or particulate in air at 25C(77F)and 101.3 kPa(29.92 in.Hg).NOTE1Some particulate matter will collect on the wall of the sampletube.If this loss is to be eval
