1、Designation:D326891(Reapproved 2011)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 inch-pound units in parentheses may be approxi-mate.1.3 This standard does not purport to address all of thesafety concern
7、s,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:2D1193 Specification for Reagent WaterD1356 Ter
8、minology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD3266 Test Method for Automated Separation and Collec-tion of Particulate and Acidic Gaseous Fluoride in theAtmosphere(Double Paper Tape Sampler Method)D3267 Test Method for Separ
9、ation 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 Content ofthe Atmosphere and Plant Tissues(Manual Procedures)(Withdrawn 2010)3D3270 Test Methods for Analysis for Fluoride Content ofthe
10、 Atmosphere and Plant Tissues(SemiautomatedMethod)3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod refer to Terminology D1356.4.Summary of Test Method4.1 Gaseous fluorides are removed from the air stream byreaction with sodium bicarbonate coated on the inside wall ofa bor
11、osilicate 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 analyzed forfluoride.The particulate matter collected by the filter is elutedwith acid and analyzed for fluoride(1-4).4The results arere
12、ported 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 evaluated,use 7test methods such as Test MethodD3266 or Test Method D3267 for comparison since the filter for collectingp
13、articulate precedes the absorbers for gases Mandl and Weinstein(2)1This 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 Oct.1,2011.Published October 2
14、011.Originallyapproved in 1973.Last previous edition approved in 2005 as D3268 91(2005).DOI:10.1520/D3268-91R11.2For 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 stand
15、ards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4The boldface numbers in parentheses refer to references at the end of this testmethod.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA
16、 19428-2959.United States1 provide some information relative to potential loss of particulate matter.5.Significance and Use5.1 The sodium bicarbonate coated tube filter method pro-vides a means of separating and collecting atmospheric gas-eous fluoride and particulate fluoride samples.5.2 Since the samples are collected on the dry tube andfilter,the fluoride may be eluted with a small volume of eluant(see Section 10 for specific instructions on fluoride elution).Elution into a small volume and t
